Download E-books Microsoft .Net Framework 4.5 Quickstart Cookbook PDF

By Jose Luis Latorre Millas

Microsoft .NET Framework 4.5 First glance Cookbook

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Additionally doing so will be fascinating for trying out reasons. utilizing the dispatcher's new good points The Dispatcher category is a truly universal means of having access to the UI thread whereas we're on one other thread. With WPF four. five we've got a few new tools for synchronous and asynchronous operations, which make this Dispatcher category extra async and wait for pleasant. one other development is that Dispatcher. Invoke and Dispatcher. InvokeAsync at the moment are in a position to go back a cost. eventually, we even have a new parameter of CancellationToken kind, which gives the most obvious strength of having the ability to cancel dispatched initiatives. preparing so that it will use this recipe you'll have visible Studio 2012 put in. the way to do it... within the following steps we are going to see the way to use the Dispatcher classification to dispatch a role that accesses the UI thread. First open visible Studio 2012 and create a brand new undertaking. we are going to decide on the WPF program template from the visible C# type and identify it WPFDispatcher. Open the MainWindow. xaml view and upload a Button click on occasion, identify it btnDispatcher and input 1 because the content material. Open the MainWindow. xaml. cs code and alter the MainWindow classification code as follows:public MainWindow() { InitializeComponent(); this. btnDispatcher. click on += btnDispatcher_Click; } void btnDispatcher_Click(object sender, RoutedEventArgs e) { TestNewDispatcherAsyncMethod(); } public async void TestNewDispatcherAsyncMethod() { // utilization of the InvokeAsync process var TaskDoSomething = look ahead to Dispatcher. InvokeAsync>(DoSomething); // We watch for the duty to complete TaskDoSomething. Wait(); // Getting the end result from the completed job string resultFromTask = TaskDoSomething. outcome; // utilization of the Invoke strategy which returns a cost of an outlined kind var returnedOject = Dispatcher. Invoke( DoSomethingElse); } inner most string DoSomethingElse() { go back "hi"; } inner most async Task DoSomething() { //As we're being dispatched shall we entry the UI thread and update-change whatever there... String num = this. btnDispatcher. content material. ToString(); int iNum; int. TryParse(num, out iNum); iNum = iNum + 1; this. btnDispatcher. content material = iNum. ToString(); go back "I may still do something... "; } we will be able to now execute the code and click on the button. for each click on it's going to bring up its price by way of one. the way it works... we now have used one of many new Dispatcher tools, which are referred to as asynchronously. // utilization of the InvokeAsync procedure var TaskDoSomething = look forward to Dispatcher. InvokeAsync>(DoSomething); the instance illustrates find out how to obtain the results of activity the place we're altering a UI point and returning a cost. we will be able to detect that we're executing a dispatcher operation asynchronously, that is in sync with the UI thread. we're additionally invoking it within the ordinary non-asynchronous means with: // utilization of the Invoke strategy which returns a price of an outlined style var returnedOject = Dispatcher. Invoke( DoSomethingElse); As you will see that, we will be able to now go back a end result worth of a selected kind with a Dispatcher.

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