什么是新的C＃等待功能吗？ [英] What's the new C# await feature do?

问题描述

谁能解释一下等待函数呢？

推荐答案

他们只是谈到这在PDC 昨天！

等待在一个与.NET任务（并行编程）一起使用。它在.NET的下一个版本引入的关键字。这或多或少让你暂停的方法的执行等待任务完成执行。这里有一个简单的例子：

Await is used in conjunction with Tasks (parallel programming) in .NET. It's a keyword being introduced in the next version of .NET. It more or less lets you "pause" the execution of a method to wait for the Task to complete execution. Here's a brief example:

//create and run a new task  
Task<DataTable> dataTask = new Task<DataTable>(SomeCrazyDatabaseOperation);

//run some other code immediately after this task is started and running  
ShowLoaderControl();  
StartStoryboard();

//this will actually "pause" the code execution until the task completes.  It doesn't lock the thread, but rather waits for the result, similar to an async callback  
// please so also note, that the task needs to be started before it can be awaited. Otherwise it will never return
dataTask.Start();
DataTable table = await dataTask;

//Now we can perform operations on the Task result, as if we're executing code after the async operation completed  
listBoxControl.DataContext = table;  
StopStoryboard();  
HideLoaderControl();

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