blocks|key|4513176|text|尝试使用BackgroundWorker类，它的设计就是为了做你需要的事情。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4513177|有关msdn的示例和更多详细信息：http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx|offset|length|4513178|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx^0|0|H|2B|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Try using BackgroundWorker class, its was designed to do exactly what you need.

Example and more details on msdn: <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx</a>

blocks|key|447950|text|尝试Backgroundworker类。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|447951|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/74880/delegating-a-task-in-and-getting-notified-when-it-completes-in-c^0|2|G|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Try the <a href="https://stackoverflow.com/questions/74880/delegating-a-task-in-and-getting-notified-when-it-completes-in-c">Backgroundworker</a> class.

blocks|key|3667787|text|使用BackgroundWorker。它还省去了在UI和后台trhead之间来回编组数据的麻烦，并允许进度通知和取消。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3667788|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use a BackgroundWorker. It also saves you the trouble of marshalling data back and forth between UI and background trheads, and it allows progress notifications and cancelling.

blocks|key|3667929|text|使用事件和线程池|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3667930|var+asyncResult+=+pop3delegate.BeginInvoke(null,null);
ThreadPool.RegisterWaitForSingleObject(
++++asyncResult.WaitHandle,+FunctionToCallWhenDone,+null,+TimeSpan.Infinite,+true);|code-block|syntax|javascript|3667931|这将在数据到达时调用您的FunctionToCallWhenDone。您还使用了ThreadPool，它应该比创建自己的线程更便宜。然而，正如Kurt+Schelfthout所指出的，你必须做一些像uielement.Invoke(()=>{一些代码})这样的事情来改变UI。|3667932|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Use event and threadpool

<pre><code>var asyncResult = pop3delegate.BeginInvoke(null,null);
ThreadPool.RegisterWaitForSingleObject(
 asyncResult.WaitHandle, FunctionToCallWhenDone, null, TimeSpan.Infinite, true);
</code></pre>

This will call your FunctionToCallWhenDone when data arrives. You're also using ThreadPool which should be cheaper than creating own thread. However, as Kurt Schelfthout noted you'll have to do something like uielement.Invoke(()=>{some code}) to change UI.

blocks|key|1085477|text|你不需要阻塞或循环，你可以简单地传递一个回调方法(委托)作为你的BeginInvoke调用的第一个参数，在这里你可以调用EndInvoke进程异常等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1085478|private+delegate+int+LongRunningTaskHandler();
static+void+Main(string[]+args)+{
++++LongRunningTaskHandler+handler+=+LongRunningTask;
++++handler.BeginInvoke(MyCallBack,+null);
++++Console.ReadLine();
}
private+static+void+MyCallBack(IAsyncResult+ar)+{
++++var+result+=+(LongRunningTaskHandler)((AsyncResult)+ar).AsyncDelegate;
++++Console.WriteLine(result.EndInvoke(ar));
}
public+static+int+LongRunningTask()
{
++++Thread.Sleep(5000);
++++return+42;
}|code-block|syntax|javascript|1085479|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You don't need to block or loop, you can simply pass a callback method (delegate) as the first parameter of your BeginInvoke call, here you can call EndInvoke process exceptions etc.

<pre><code>private delegate int LongRunningTaskHandler();
static void Main(string[] args) {
 LongRunningTaskHandler handler = LongRunningTask;
 handler.BeginInvoke(MyCallBack, null);
 Console.ReadLine();
}
private static void MyCallBack(IAsyncResult ar) {
 var result = (LongRunningTaskHandler)((AsyncResult) ar).AsyncDelegate;
 Console.WriteLine(result.EndInvoke(ar));
}
public static int LongRunningTask()
{
 Thread.Sleep(5000);
 return 42;
}
</code></pre>

I have written a class that checks a POP3 account and I'd like it to execute on a thread other than the UI thread.

To do this, I've chosen the asynchronous route.

In order to get the result from pop3delegate.BeginInvoke(null,null) I need to call EndInvoke but doing this in the UI thread blocks rendering the UI unusable.

I could use the IAsyncResult object and check the IsComplete property, but this involves putting in a loop which checks and this in turn locks up the UI.

What I'm looking for is a way to get a percentage complete or some sort of a status from the POP3 class, which in turn updates the UI and also allows the UI to be usable to do other tasks. I'll also need to call the EndInvoke method at some point in order to catch any exceptions thrown on the worker thread.

Any suggestions?

Calling synchronous methods asynchronously on the UI thread

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我已经编写了一个检查POP3帐户的类，我希望它在UI线程以外的线程上执行。为此，我选择了异步路由。为了从pop3delegate.BeginInvoke(null，null)获得结果，我需要调用EndInvoke，但在UI线程块中执行此操作会导致UI不可用。我可以使用IAsyncResult对象并检查IsComplete属性，但这涉及到将检查放入一个循环中，这反过来会锁定UI。我正在寻找的是一种从

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