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70-355 exam Dumps Source : Universal Windows Platform - App Data, Services, and Coding Patters

Test Code : 70-355
Test cognomen : Universal Windows Platform - App Data, Services, and Coding Patters
Vendor cognomen : Microsoft
: 47 existent Questions

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Microsoft Universal Windows Platform -

Microsoft's home windows File supervisor now runs on complete windows 10 contraptions | killexams.com existent Questions and Pass4sure dumps

Microsoft's Windows File Manager now runs on   complete Windows 10 devices SAN FRANCISCO: Microsoft has launched its original home windows File supervisor as a criterion home windows Platform (UWP) app within the Microsoft withhold and has made it obtainable for complete devices operating home windows 10.

home windows File supervisor is Microsoft's graphical consumer interface (GUI) during which finish clients might discern and manipulate files and folders on home windows computers allowing finish users to circulation, reproduction, rename, print, delete and search information and folders.

The UWP version of windows File supervisor is attainable to subsist installed on notebook, cellular, surface Hub and HoloLens, the Microsoft withhold checklist reads, which is only partially authentic, Softmedia information said on Saturday.

"in line with the official system requirements, you deserve to subsist working at least windows 10 build 16299, which isn't accessible on cellular instruments, so listing telephones as a supported platform does not construct a noteworthy deal sense," the record noted.

The project, maintained on Microsoft's net-based mostly internet hosting carrier - GitHub - has been made available for download and compiled by anybody on windows 10.

Microsoft is additionally allowing clients to contribute with ideas and counsel the usage of the GitHub web page.

"The windows File supervisor lives once more and runs as a local x86 and x64 computer app on complete currently supported edition of windows, together with home windows 10. I welcome your innovations, comments and guidance," the GitHub web page reads.

The customary windows File supervisor first debuted as portion of home windows three.0.

historical windows File supervisor now attainable as UWP app in Microsoft withhold | killexams.com existent Questions and Pass4sure dumps

Microsoft has redeem the windows File manager, which changed into in home windows on account that windows three.0 on the Microsoft store, so it will possibly used as an app in windows 10. The File manager is launched as a so-called conventional home windows Platform app.

up to now, Microsoft already published the source code on the windows File supervisor on open-supply hosting platform Github. This allowed users to repair bugs and to create their personal version of the windows File manager.

Now, anyway publishing the supply code, Microsoft has additionally published the windows File manager within the Microsoft save.

home windows File supervisor is attainable for home windows 10 construct 16299 or later, home windows 10 cell, floor Hub and the HoloLens.

We don't exhibit remark's on information reports, in its status you're very welcome to subsist portion of the discussion on this topic on their forum.

Microsoft brings Win32 laptop apps to home windows combined fact | killexams.com existent Questions and Pass4sure dumps

The home windows blended fact journey in home windows 10 means that you can placed on a VR headset and engage with apps, video games, and video clips in a extra immersive pass than you may wall gazing a video pomp or computer reveal. but what if you just want to accomplish some web searching, try a PowerPoint presentation, or hearken to tune with out removing your headset?

home windows mixed reality already means that you can Run time-honored windows Platform apps downloaded from the Microsoft shop. And now Microsoft has introduced it’s working on including aid for Win32 computing device apps (relatively a friendly deal the repose that you would subsist able to install and Run on a windows pc).

An early edition of the feature is already accessible in home windows 10 Insider Preview construct 18329, and it can construct its solution to complete users later this yr.

Microsoft says Win32 apps “similar to Spotify, Paint.internet, and visual Studio Code” now work in windows combined truth… however uphold is still a piece in development and the event can subsist buggy.

To launch a Win32 app, Microsoft says you open the Pins Panel, vanish to the record of complete apps, after which you’ll discern a folder referred to as “classic Apps (Beta) that may still comprise an inventory of complete computer apps installed in your computing device.

different adjustments in windows 10 developed 18329 encompass:

  • a listing of desirable apps may subsist pinned to the top of the search window
  • Keyboard aid for ADLaM and Osage
  • up-to-date Mail and Calendar apps with aid for darkish mode and default font selections
  • quite a lot of malicious program fixes
  • These and other updates may still subsist included within the next predominant unencumber of home windows 10, which is at present referred to as 19H1, indicating that it’ll subsist purchasable within the first half of 2019.

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    Universal Windows Platform - App Data, Services, and Coding Patters

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    Inside the Universal Windows Platform Bridges | killexams.com existent questions and Pass4sure dumps


    Inside the Universal Windows Platform Bridges

    Microsoft's four-fold path leading to a singular coding platform is becoming a existent possibility.

    Astoria. Islandwood. Centennial. Westminster. None of these project names fill any connection to one another, as far as they can expose -- except that each is a project names for four Universal Windows Platform Bridge tools that can subsist used to develop Windows 10 apps from specific source code environments for the newer Windows Store. The eventual point is for those apps to subsist able to Run on any Windows profile factor, from phones to desktops to devices running the Windows Holographic Platform environment.

    The tools were announced at Build on Wednesday in a segment of the keynote featuring Microsoft Terry Myerson, who quickly demonstrated each of the features.

    Project Astoria is the Android runtime bridge, which can subsist used from the Android Studio IDE to refactor Android app code for the Windows 10 platform. It will comprise a Windows emulator, and is conjectural to allow for debugging and testing of apps from either the Android IDE or Visual Studio IDE. (Coincidentally, Astoria was used in the past for Windows Communications Framework Data Services, according to this Wikipedia reference page; it's not uncommon for Microsoft to reuse a name.)

    In similar fashion. Project Islandwood toolkit is an iOS bridge for developing from Objective-C. Myerson demonstrated some of the progress his group has made with the tool, showing the ability to debug and test Xcode from within the Visual Studio IDE.

    Project Centennial is aimed at Windows developers who want a shortcut for recasting current .NET and Win32 Windows apps for the newer Windows Store.

    Finally, Project Westminster is aimed at Website publishers who want to package up their sites for delivery via the Windows Store. Those apps will subsist able to acquire edge of Windows APIs, and Website updates are automatically updated without having to republish the package to the Windows Store.

    The tools are currently in preview, and Microsoft is looking for preview developers; to note up, vanish here. The company plans to deliver them sometime this summer.

    Watch Myerson's demonstration of the bridge tools in this Day 1 keynote; it's at around the 1:46:00 mark. You can besides collect some background on the development of the Universal Windows Platform from the Day 1 sessions in this presentation recorded at Build 2015.

    About the Author

    You expose 'Em, Readers: If you've read this far, know that Michael Domingo, Visual Studio Magazine Editor in Chief, is here to serve you, dear readers, and wants to collect you the information you so richly deserve. What news, content, topics, issues accomplish you want to discern covered in Visual Studio Magazine? He's listening at mdomingo@1105media.com.

    How to Design indigenous Mobile Apps | killexams.com existent questions and Pass4sure dumps

    UX HowBlockedUnblockFollowFollowing

    Feb 8, 2016

    Apps are a immense portion of product and service feel points — and are only growing. Each year users are spending more time on their devices (an average of 2 hours and 42 minutes per day in 2014) and spend 86% of their time in apps with no signs of slowing down.

    Here is what I fill erudite from and with others on how to design indigenous mobile apps.

    Top 5 Tips for Designing Apps 1) Read the HIG

    Learn the rules from the Human Interface Guidelines (HIG), then pattern out whether you should demolish them elegantly.

    4) construct it Move

    States, animations and transitions are key distinguishing features of elegant app experiences.

    Create a motion study, uneven prototype or even better — jump into code and really dig into what makes or breaks an app.

    Material Design with Framer.js 5) Services First

    The attribute of indigenous mobile app experiences are completely intertwined with the services that power them. In order to provide the best front finish app experience, services necessity to subsist designed, implemented and uphold data flow based on user necessity and context.

    As a Designer, you necessity to start thinking this pass and connect with your development partners on how services are being optimized (or not) for indigenous mobile apps.

    Native is Not Web

    At first indigenous and web browser designs look very similar. Many friendly design practices and principles from the web apply to indigenous mobile apps — but there are key differences.

    Inbox Views and Transitions No Pages

    Apps fill states, modes and views and are often enabled and communicated through indigenous animations.

    This provides much more context in an sustain and UI views conditional on a number of conditions.

    Apps should fill elegant seams and smooth transitions, not waiting for page loads.


    The interaction model is fundamentally different on a feel UI device.

    There is no equivalent of rollover or hover on an app and a “right-click” is being explored with functionality fondness 3DTouch.

    Input / Output

    A mobile app has access to much more than just a screen. For instance, confirmation of an action doesn’t fill to subsist visual — it could subsist accomplished with haptic feedback (vibration).

    Potential Inputs include: Camera, GPS, gyroscope, accelerometer, wifi/bluetooth connection, voice, Contact List / Address Book, camera, photo gallery, microphone and more with each original device.

    Different Output options comprise sound, haptic/vibration, notifications and the screen.

    This smooth of access however comes with the necessity to subsist responsible:

    Apps are Not Browsers

    In an app, you are designing and pile everything the browser has to accomplish too — and you don’t collect things “for free”.

    Github 404 Error Page

    “There are no 404 Errors in Apps” is a favorite adage of a Technology Director I ally with.

    When something doesn’t work on a indigenous app, the user will constantly exact themselves:

    “Is it the app, my phone or the connection?”

    As a designer, you necessity to address this and communicate elegantly when things are not optimal or unknown. Additional conditions you necessity to account for on indigenous mobile apps include:

  • Offline States
  • Intermittent Connectivity
  • Service call Failures (Single or Multiple)
  • Loading (Blocking Loader, Inline or Progressive?)
  • Caching Data (How long should “old” data subsist kept?)
  • First Time sustain (Show a tutorial?)
  • Second Time sustain (Don’t prove a tutorial?)
  • When an app is brought into the Foreground
  • When an app is switched into the Background
  • Live and Die by the Store

    Apps are fondness movies and music — they fill ratings and reviews that are broadcast to anyone who might arbitrator of downloading it.

    Often times a user will already fill an print and seen comments before experiencing it for themselves.

    Real reviews from the App Store

    Reviews, Ratings and Comments will often give feedback about network, service or content issues that you necessity to proactively account for in the design.

    Because of this, apps are more faultfinding to test and depending on how they are built, can subsist very difficult to update quickly when a bug or issue is found — and before it is broadcast to everyone else.

    iOS and Android Differences

    Over time the, the immense two platforms fill converged in some ways and taken different and drastic turns in other directions.

    Be mindful of these key discrete differences when designing a indigenous mobile app for one, the other or both.

    1) The Back Button

    I am not talking about Up vs. Back or the feel screen back arrow on apps. I am talking about the actual hardware back button built into Android devices and nowhere to subsist create on iOS.

    Be prepared to respond the question at any point in a flow when your developer asks:

    “What happens when I hit the back button on Android?”

    2) Open vs Closed

    The iOS App Store is a very closed marketplace and iOS limits access for Apps to unavoidable device inputs and outputs. Due to the review process for App Store, an App may not subsist published or released for up to 2 weeks after submission, pending approval.

    The Google Play store is much more open and the platform allows deeper integration into indigenous input and output methods. There is minimal review process for the Google Play Store and apps are published almost immediately.

    3) Top vs Bottom Screenshots from Facebook on iOS and Android

    Same app, same content and the main navigation is flipped between top and bottom. iOS has a sturdy preference for main sections of the app in the bottom Tab Bar while Android encourages using the Navigation Drawer and other constructs.

    4) consume of Screen Real Estate Design Explosions #1 — Mapping on iOS by UX Launchpad

    iOS and Material Design construct different consume of the canvas or existent estate of the screen. As this breakdown of Apple Maps vs Google Maps shows, Material Design favors Floating Action Buttons and transparency while iOS employs more navigation “stripes” at the top and bottom.

    5) The Guidelines

    Each platform has 3 key principles or themes in the Guidelines, but are emphasized and interpreted in different ways.

    iOS Themes

    DeferenceThe UI helps people understand and interact with the content, but never competes with it.

    ClarityText is legible at every size, icons are precise and lucid, adornments are subtle and appropriate, and a sharpened focus on functionality motivates the design.

    DepthVisual layers and realistic motion impart vitality and heighten people’s delight and understanding.

    Material Principles

    Material is the metaphorA material metaphor is the unifying theory of a rationalized space and a system of motion. The material is grounded in tactile reality, inspired by the study of paper and ink, yet technologically advanced and open to fancy and magic.

    Bold, graphic, intentionalThe foundational elements of print-based design — typography, grids, space, scale, color, and consume of imagery — guide visual treatments. These elements accomplish far more than please the eye. They create hierarchy, meaning, and focus.

    Motion provides meaningMotion respects and reinforces the user as the prime mover. Primary user actions are inflection points that initiate motion, transforming the entire design.

    Learn by Doing

    Best pass to learn how to design indigenous mobile apps is to design them.

    The easiest status to start is with a pre-existing GUI template, fondness the iOS Template from Facebook:

    I mentioned earlier reverse engineering your favorite app.

    Go ahead… literally trail indigenous app patterns to alleviate build a design language of what works and understand the foundational elements.

    It can subsist a immense jump to vanish from designing to even dabbling in code, but it is worth it. When you walk in someone’s shoes (or tools) you acquire:

  • Empathy for development (and users)
  • Intuitively understand each operating system and the standards
  • Truly learn by doing
  • If you are really hesitant about jumping into indigenous mobile app development — there are number of easier prototyping tools out there that simulate the experience.

    I try and walk the walk — this is a sample Calculator template I followed and connected in Xcode back in the day:

    If you are not horrified off yet, I highly cheer taking the profound dive into designing and coding your own app. Design + Code is the next step, starting from design tools fondness Sketch and then implementing in the latest development tool.

    The best pass to learn is to create something that you’d want to use. Guidelines are most useful while you’re directly manipulating results. — Meng To

    Looking for More?

    Access an always updated list of the best indigenous mobile app prototyping tools along with top UX design portfolio articles, services, products and UX Design resources at UX How.

    (Originally posted at UX How on November 23, 2015)

    The MVVM Pattern – Introduction | killexams.com existent questions and Pass4sure dumps

    Model-View-ViewModel (from now on, just MVVM) is a “love/hate” topic when it comes to Universal Windows app development. If you fill never used it and try it for the first time, you’ll probably find yourself a dinky bit confused, since it’s a completely different approach than the criterion one based on the code behind. On the other hand, if you’re a long time MVVM user, you probably won’t subsist able to create a original project using any other approach.

    This is the understanding I’ve decided to write the following sequence of posts. What’s MVVM? Why is it so widely adpoted when it comes to Universal Windows apps development and, generally speaking, by any XAML based technology?

    I hope that by the finish of the journey, you’ll find answers to complete of your questions and subsist able to start using the MVVM pattern in your apps without being horrified anymore.

    The MVVM Pattern

    The first thing you fill to understand is that MVVM isn’t a framework or a library, but a pattern. It isn’t a set of APIs or methods, but a pass to define the architecture of an application. You’ve probably already heard about MVVM Light or Caliburn Micro, but you don’t fill to confuse them with MVVM; they’re tools that helps developers to adopt the MVVM pattern, they don’t picture the pattern itself.

    The purpose of a pattern is to alleviate developers to define the architecture of an application. Why is it so well-known to accomplish it? Why can’t they simply continue to develop an application in the pass they are used to, which is writing complete the code in the code-behind class? The criterion approach is very quick and simple to understand, but it has many limitations when it comes to more complicated projects that necessity to subsist maintained over time. The understanding is that the code-behind class has a very tight dependency with the XAML page. Consequently, most of the code can’t subsist isolated and they finish up mixing traffic logic and the presentation layer.

    In the long run, the code behind approach introduces many problems:

  • It’s more complicated to maintain the code and evolve the project. Every time they necessity to add a original feature or decipher a bug, it’s difficult to understand where precisely they necessity to accomplish it, since there isn’t a transparent distinction between the various components of the app. This becomes even more precise if they necessity to resume working on a project which has been “on hold” for a long time.
  • It’s complicated to perform unit testing. When it comes to complicated projects, many developers and companies are adopting the unit test approach, which is a pass to perform automatic tests that validate diminutive pieces of code. This pass it becomes easier to evolve the project: every time they add a original feature or they change some existing code, they can easily verify if the work we’ve done has broken the already existing features of the app. However, having a tight dependency between the logic and the user interface makes it nearly impossible to write unit tests, since the code isn’t isolated.
  • It’s complicated to design the user interface: since there’s a tight relationship between the user interface and the traffic logic, it isn’t workable for a designer to focus on the user interface without knowing complete the implementation details behind it. Questions fondness “Where is the data coming from? A database? A cloud service?” shouldn’t subsist asked by a designer.
  • The goal of the MVVM pattern is to “break” this sturdy connection between the code behind and the user interface, making it easier for a developer to understand what the different components of the application are. More precisely, it’s fundamental to distinguish the components which acquire trust of the traffic logic and the ones that handle the data presentation.

    The cognomen of the pattern comes from the fact that the project is split into three different components, which we’re now going to explore in details.

    The Model

    The model is the component of the application that defines and handles complete the basic entities of the application. The goal of this layer is to remove any dependency from the pass the data is represented. Ideally, you should subsist able to acquire the classes that belong to this component and consume them in another application without applying any change. For example, if you’re working on an application to handle orders and customers of a company, the model could subsist defined by complete the classes which define the basis entities, fondness a customer, an order, a product, etc.

    The View

    The view is at the contradictory side of the model and it’s represented by the user inteface. In the Universal Windows apps world, views are made by the XAML pages, which accommodate complete the controls and animations that define the visual layout of the application. Recyicling the already mentioned sample of an app to handle orders and customers, they can fill multiple views to pomp the list of customers, the available products in the warehouse, the orders made by a customer, etc.

    The ViewModel

    The ViewModel is the connection point between the view and model; it takes trust of retrieving the raw data from the model and manipulates it so that it can subsist properly displayed by the view. The huge inequity with a code behind class is that the ViewModel is just a unostentatious simple class, without any dependency from the View. In an application based on the MVVM pattern, typically you create a ViewModel for every View.

    Why the MVVM Pattern?

    After this brief introduction, it should subsist easier to understand why the MVVM pattern is so well-known and how, by adopting it, they can decipher complete of the problems mentioned at the dawn of the post.

  • By splitting the code in three different layers it becomes easier, especially if you’re working in a team, to maintain and evolve the application. If you necessity to add a feature or solve a bug, it’s easier to identify which layer has to subsist manipulated. Moreover, since there is no dependency between each layer, the work can subsist besides done in parallel (for example, a designer can start working on the user interface while another developer can create the services which will subsist used by the page to retrieve the data).
  • To properly perform unit testing, the code to test has to subsist as simple and isolated as possible. When you work with the code-behind approach, this is simply not possible; often the logic is connected to an event handler (for example, because the code has to subsist executed when you press a button) and you would necessity to find a pass to simulate the event in order to trigger the code to test. By adopting the MVVM pattern they demolish this tight dependency; the code included in a ViewModel can subsist easily isolated and tested.
  • Since they fill broken the tight connection between the user interface and the traffic logic, it’s simple for a designer to define the interface without having to know complete of the implementation details of the application. For example, if the designer has to work on a original page which displays a list of orders, they can easily swap the existent ViewModel (which retrieves the data from a existent data source, fondness a cloud service or a database) with a fake one, which can generate fake data that allows the designer to easily understand which kindhearted of information the page should display.
  • Why in the Universal Windows app world accomplish most of the developers attend to consume the MVVM pattern and not other celebrated patterns fondness MVC or MVP? Mainly, because the MVVM pattern is based on many features which are at the core of the XAML runtime, like: binding, dependency properties, etc. In this sequence of posts we’re going to talk a bit more about these features. You can notice how I’ve just mentioned XAML runtime and not the Universal Windows Platform: the understanding is that most of the things we’re going to discern in these posts aren’t specific to the Universal Windows app world, but they can subsist applied to any XAML based technology, like: WPF, Silverlight, Windows Phone, Xamarin, etc.

    Now, let’s acquire a closer inspect at what the basic XAML features leveraged by the MVVM pattern are.

    The Binding

    Binding is one of the most well-known XAML features and allows us to create a communication channel between two different properties. They can subsist properties that belong to different XAML controls, or a property declared in code with a control’s property. The key feature leveraged by the MVVM pattern is the second one: View and ViewModels are connected thanks to binding. The ViewModel takes trust of exposing the data to prove in the View as properties, which will subsist connected to the controls that will pomp them using binding. Let’s say, for example, that they fill a page in the application that displays a list of products. The ViewModel will acquire trust of retrieving this information (for example, from a local database) and store it into a specific property (like a collection of kind List<Order>):

    public List<Order> Orders { get; set; }

    To pomp the collection in a traditional code behind app, at some point, you would manually allot this property to the ItemsSource property of a control fondness ListView or GridView, fondness in the following sample:

    MyList.ItemsSource = Orders;

    However, this code creates a tight connection between the logic and the UI; since we’re accessing to the ItemsSource property using the cognomen of the control, they can perform this operation only in the code behind class.

    Instead, with the MVVM pattern they connect properties in the ViewModel with controls in the UI using binding, fondness in the following sample:

    <ListView ItemsSource="{Binding Path=Orders}" />

    This way, they fill broken the dependency between the user interface and the logic, since the Orders property can subsist defined besides in a unostentatious simple class fondness a ViewModel.

    As already mentioned, binding can subsist besides bidirectional; this approach is used when not only the ViewModel needs to pomp some data in the View, but besides the View should subsist able to change the value of one of the ViewModel’s properties. Let’s whisper that your application has a page where it can create a original order and, consequently, it includes a TextBox control where to set the cognomen of the product. This information needs to subsist handled by the ViewModel, since it will acquire trust of interacting with the model and adding the order to the database. In this case, they apply to the binding the Mode ascribe and set it to TwoWay, so that everytime the user adds some text to the TextBox control, the connected property in the ViewModel will collect the inserted value.

    If, in the XAML, they fill the following code, for example:

    <TextBox Text="{Binding Path=ProductName, Mode=TwoWay}" />

    It means that in the ViewModel they will fill a property called ProductName, which will hold the text inserted by the user in the box.

    The DataContext

    In the previous section we’ve seen how, thanks to the binding, they are able to connect the ViewModel’s properties to the controls in the XAML page. You may subsist wondering how the View model is able to understand which is the ViewModel that populates its data. To understand it, they necessity to interject the DataContext’s concept, which is a property offered by any XAML Control. The DataContext property defines the binding context: every time they set a class as a control’s DataContext, they are able to access complete of its public properties. Moreover, the DataContext is hierarchical: properties can subsist accessed not only by the control itself, but besides complete of the children controls will subsist able to access to them.

    The core implementation of the MVVM pattern relies on this hierarachy: the class that they create as ViewModel of a View is defined as DataContext of the entire page. Consequently, every control they status in the XAML page will subsist able to access the ViewModel’s properties and prove or handle the various information. In an application developed with the MVVM pattern, usually, you finish up having a page declaration fondness the following one:

    <Page x:Class="Sample.MainPage" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" DataContext="{Binding Source={StaticResource MainViewModel}}" mc:Ignorable="d"> <!-- page content goes here --> </Page>

    The DataContext property of the Page class has been connected to a original instance of the MainViewModel class.

    The INotifyPropertyChanged interface

    If they try to create a simple application based on the MVVM pattern applying the concepts we’ve erudite so far, they would quickly hit a immense issue. Let’s consume the previous sample of the page to add a original order and let’s whisper that they have, in the ViewModel, a property which they consume to pomp the product’s name, fondness the following one:

    public string ProductName { get; set; }

    According to what they fill just learned, they await to fill a TextBlock control in the page to pomp the value of this property, fondness in the following sample:

    <TextBlock Text="{Binding Path=ProductName}" />

    Now, let’s whisper during the excecution of the app the value of the ProductName property changes (for example, because a data loading operation is terminated). They will notice how, despite the fact that the ViewModel will properly hold the original value of the property, the TextBlock control will continue to prove the ripen one. The understanding is that binding isn’t enough to handle the connection between the View and the ViewModel. Binding has created a channel between the ProductName property and the TextBlock, but no one notified both sides of the channel that the value of the property has changed. For this purpose, XAML offers the concept of dependency properties, which are special properties that can define a complicated conduct and, under the hood, are able to forward a notification to both sides of the binding channel every time its value changes. Most of the basic XAML controls consume dependency properties (for example, the Text property of the TextBlock control is a dependency property). However, defining a original dependency property isn’t very straightforward and, in most cases, it offers features which aren’t needed for their MVVM scenario. Let’s acquire the previous sample based on the ProductName property: they don’t necessity to handle any special conduct or logic, they just necessity that every time the ProductName property changes, both sides of the binding channel receive a notification, so that the TextBlock control can update its visual layout to pomp the original value.

    For these scenarios, XAML offers a specific interface called INotifyPropertyChanged, which they can implement in their ViewModels. This way, if they necessity to notify the UI when they change the value of a property, they don’t necessity to create a complicated dependency property, but they just necessity to implement this interface and invoke the related pass every time the value of the property changes.

    Here is how a ViewModel that implements this interface looks:

    public class MainViewModel: INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; [NotifyPropertyChangedInvocator] protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) { PropertyChanged?.Invoke(this, original PropertyChangedEventArgs(propertyName)); } }

    Notice how the implementation of this interface allows us to call a pass called OnPropertyChanged(), that they can invoke every time the value of a property changes. However, to reach this goal, they necessity to change the pass they define the properties inside their ViewModel. When it comes to simple properties, usually they define them using the short syntax:

    public string ProductName { get; set; }

    Hower, with this syntax they can’t change what happens when the value of the property is written or read. As such, they necessity to vanish back to consume the ripen approach, based on a private variable which holds the value of the property. This way, when the value is written, they are able to invoke the OnPropertyChanged() pass and dispatch the notification. Here is how a property in a ViewModel looks:

    private string _productName; public string ProductName { collect { return _productName; } set { _productName = value; OnPropertyChanged(); } }

    Now the property will work as expected; when they change its value, the TextBlock control in binding with it will change its appearance to pomp it.

    Commands (or How to handle Events in MVVM)

    Another faultfinding scenario when it comes to developing an application is to handle the interactions with the user: he/she could press a button, select an item in a list, etc. In XAML, these scenarios are handled using events which are exposed by various controls. For example, if you want to handle that the button has been pressed, they necessity to subscribe to the Click event, fondness in the following sample:

    <Button Content="Click me" Click="OnButtonClicked" />

    The event is managed by an event handler, which is a pass that includes, among the various parameters, some information which is useful to understand the event context (for example, the control which triggered the event or which item of the list has been selected), fondness in the following sample:

    private void OnButtonClicked(object sender, RoutedEventArgs e) { //do something }

    The problem of this approach is that event handlers fill a tight dependency with the View; they can subsist declared, in fact, only in the code behind class. When you create an application using the MVVM pattern, complete the data and logic is usually defined in the ViewModel instead, so they necessity to find a pass to handle the user interaction there.

    For this purpose, the XAML has introduced commands, which is a pass to express a user interaction with a property instead of with an event handler. Since it’s just a simple property, they can demolish the tight connection between the view and the event handler and besides define it in an independent class, fondness a ViewModel.

    The framework offers the ICommand interface to implement commands: with the criterion approach, you finish up having a separated class for each command. The following instance shows how a command looks:

    public class ClickCommand : ICommand { public bool CanExecute(object parameter) { } public void Execute(object parameter) { } public event EventHandler CanExecuteChanged; }

    The core of the command is the Execute() method, which contains the code that is executed when the command is invoked (for example, because the user has pressed a button). It’s the code that, in a traditional application, they would fill written inside the event handler.

    The CanExecute() pass is one of the most snoopy features provided by commands, since it can subsist used to handle the command’s lifecycle when the app is running. For example, let’s whisper that you fill a page with a profile to fill, with a button at the finish of the page that the user has to press to forward the form. Since complete the fields are required, they want to disable the button until complete the fields fill been filled. If they handle the operation to forward the profile with a command, they are able to implement the CanExecute() pass in a pass that it will return deceptive when there’s at least one domain still empty. This way, the Button control that they fill linked to the command will automatically change his/her visual status: it will subsist disabled and the user will immediately understand that he won’t subsist able to press it. 


    In the end, the command offers an event called CanExecuteChanged, which they can invoke inside the ViewModel every time the condition they want to monitor to handle the status of the command changes. For example, in the previous sample, they would call the CanExecuteChanged event every time the user fills one of the fields of the form.

    Once they fill defined a command, they can link it to the XAML thanks to the Command property, which is exposed by every control that are able to handle the interaction with the user (like Button, RadioButton, etc.)

    <Button Content="Click me" Command="{Binding Path=ClickCommand}" />

    As we’re going to discern in the next post, however, most of the toolkits and frameworks to implement the MVVM pattern proffer an easier pass to define a command, without forcing the developer to create a original class for each command of the application. For example, the celebrated MVVM Light toolkit offers a class called RelayCommand, which can subsist used to define a command in the following way:

    private RelayCommand _sayHello; public RelayCommand SayHello { collect { if (_sayHello == null) { _sayHello = original RelayCommand(() => { Message = string.Format("Hello {0}", Name); }, () => !string.IsNullOrEmpty(Name)); } return _sayHello; } }

    As you can see, they don’t necessity to define a original class for each command, but by using anonymous methods, they can simply create a original RelayCommand object and pass, as parameters:

  • The code that they want to excecute when the command is invoked.
  • The code that evaluates if the command is enabled or not.
  • We’re going to learn more about this approach in the next post.

    How to Implement the MVVM Pattern: Toolkits and Frameworks

    As I mentioned at the dawn of the post, MVVM is a pattern, it isn’t a library or a framework. However, as we’ve erudite up to now, when you create an application based on this pattern you necessity to leverage a set of criterion procedures: implementing the INotifyPropertyChanged interface, handling commands, etc.

    Consequently, many developers fill started to work on libraries that can alleviate the developer’s job, allowing them to focus on the development of the app itself, rather than on how to implement the pattern. Let’s discern which are the most celebrated libraries.

    MVVM Light

    MVVM Light (http://www.mvvmlight.net) is a library created by Laurent Bugnion, a long time MVP and one of the most celebrated developers in the Microsoft world. This library is very celebrated thanks to its flexibility and simplicity. MVVM Light, in fact, offers just the basic tools to implement the pattern, like:

  • A basis class, which the ViewModel can inherit from, to collect quick access to some basic features fondness notifications.
  • A basis class to handle commands.
  • A basic messaging system, to handle the communication between different classes (like two ViewModels).
  • A basic system to handle dependency injection, which is an alternative pass to initialize ViewModels and handle their dependencies. We’ll learn more about this concept in another post.
  • Since MVVM Light is very basic, it can subsist leveraged not just by Universal Windows apps, but besides in WPF, Sivlerlight, and even Android and iOS thanks to its compatibility with Xamarin. Since it’s extremely flexible, it’s besides simple to conform it to your requirements and as a starting point for the customization you may want to create. This simplicity, however, is besides the weakness of MVVM Light. As we’re going to discern in the next posts, when you create a Universal Windows app using the MVVM pattern you will face many challenges, since many basic concepts and features of the platform (like the navigation between different pages) can subsist handled only in a code behind class. From this point of view, MVVM Light doesn’t alleviate the developer that much: since it offers just the basic tools to implement the pattern, every thing else is up to the developer. For these reasons, you’ll find on the web many additional libraries (like the Cimbalino Toolkit) which extend MVVM Light and add a set of services and features that are useful when it comes to developing a Universal Windows app.

    Caliburn Micro

    Caliburn Micro (http://caliburnmicro.com) is a framework originally created by Rob Eisenberg and now maintained by Nigel Sampson and Thomas Ibel. If MVVM Light is a toolkit, Caliburn Micro is a complete framework, which offers a completely differnent approach. Compared to MVVM Light, in fact, Caliburn Micro offers a wealthy set of services and features which are specific to decipher some of the challenges provided by the Universal Windows Platform, fondness navigation, storage, contracts, etc.

    Caliburn Micro handles most of the basic features of the pattern with naming conventions; the implementation of binding, commands, and others concepts are hidden by a set of rules, based on the names that they necessity to allot to the various components of the project. For example, if they want to connect a ViewModel’s property with a XAML control, they don’t fill to manually define a binding; they can simply give to the control the same cognomen of the property and Caliburn Micro will apply the binding for us. This is made workable by a bootstrapper, which is a special class that replaces the criterion App class and takes trust of intializing, other than the app itself, the Caliburn infrastructure.

    Caliburn Micro is, without any doubt, very powerful, since you’ll fill immediate access to complete the tools required to properly develop a Universl Windows app using the MVVM pattern. However, in my opinion, it isn’t the best altenative if you’re original to the MVVM pattern: since it hides most of the basic concepts which are at the core of the pattern, it can subsist complicated for a original developer to understand what’s going on and how the different pieces of the app are connected together.


    Prism (http://github.com/PrismLibrary/Prism) is another celebrated framework which, in the beginning, was created and maintaned by the Pattern & Practises division by Microsoft. Now, instead, it has become a community project, maintained by a group of independent developers and Microsoft MVPs.

    Prism is a framework and uses a similar approach to the one provided by Caliburn Micro: it offers naming convention, to connect the different pieces of the app together, and it includes a wealthy set of services to decipher the challenges provded by the Universal Windows Platform.

    We can whisper that it sits in the middle between MVVM Light and Caliburn Micro, when it comes to complexity: it isn’t simple and springy fondness MVVM Light but, at the same time, it doesn’t consume naming convention in an aggressive pass fondness Caliburn Micro does.

    Coming soon

    In the next posts we’re going to rotate what we’ve erudite so far into a existent project and we’re going to leverage MVVM Light for this purpose: the understanding is that, as I’ve already mentioned, I arbitrator MVVM Light is the easiest one to understand, especially if you’re original to the pattern, since it will alleviate us to learn complete the basic concepts which are at the core of the pattern. If you want to start looking at a existent project, you’ll find many samples (which we’re going to warrant in a more detailed way) on my GitHub repository at https://github.com/qmatteoq/UWP-MVVMSamples. tarry tuned!

    By the way, this post has been written with OpenLiveWriter, the original open source version of Windows Live Writer, which has now become a community driven project. In my feeling (and I'm not alone), Open Live Writer is the best tool in the world to write blog posts, so thanks to Microsoft for making this betide and thanks to complete the noteworthy developers that are contributing to the project and keeping it alive!

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    Scribd : https://www.scribd.com/document/354942193/Pass4sure-70-355-Universal-Windows-Platform-App-Data-Services-and-Coding-Patters-exam-braindumps-with-real-questions-and-practice-software
    Issu : https://issuu.com/trutrainers/docs/70-355
    Vimeo : https://vimeo.com/235289163
    Dropmark-Text : http://killexams.dropmark.com/367904/11972285
    Blogspot : http://killexams-braindumps.blogspot.com/2017/10/exactly-same-70-355-questions-as-in.html
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    publitas.com : https://view.publitas.com/trutrainers-inc/pass4sure-70-355-universal-windows-platform-app-data-services-and-coding-patters-exam-braindumps-with-real-questions-and-practice-software
    Google+ : https://plus.google.com/112153555852933435691/posts/8Kod4Qyhvqu?hl=en
    Calameo : http://en.calameo.com/books/00492352615c51ee56efa
    zoho.com : https://docs.zoho.com/file/52uch459e206393654bfcb5d0b88efeec7a02
    Box.net : https://app.box.com/s/wz048t9ia2uw7b5p8rg9hykzpxltizzy

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