blocks|key|1364450|text|如果将进度条绑定到数据属性，则不需要手动切换线程上下文。WPF绑定引擎将自动为您完成此操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1364451|<ProgressBar+Value={Binding+Progress}+/>|code-block|syntax|javascript|1364452|然后在你的线程中：|1364453|foreach+(MyClass+cls+in+Results)
{++++++++++++++++
++++++//+databinding+will+automatically+marshal+to+UI+thread
++++++this.Progress%2B%2B;
++++++cls.GetHistoryData();
}|1364454|在大多数情况下，这比使用Dispatcher.Invoke或BackgroundWorker自己编组要干净得多，也不容易出错|offset|length|1364455|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.invoke.aspx|1|http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx^0|0|0|0|0|C|H|0|U|G|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@$M|13|N|14|1|15]|$M|16|N|17|1|18]]|A|$]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]|W|$5|R|S|T|A|$U|X]]]]

If you bind the progressbar to a data property you do not need to switch the thread context manually. The WPF binding engine will do this automatically for you.

<pre><code>&lt;ProgressBar Value={Binding Progress} /&gt;
</code></pre>

And then in your thread:

<pre><code>foreach (MyClass cls in Results)
{ 
 // databinding will automatically marshal to UI thread
 this.Progress++;
 cls.GetHistoryData();
}
</code></pre>

In most cases this is much cleaner and less error prone than marshalling on your own using <a href="http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.invoke.aspx" rel="nofollow">Dispatcher.Invoke</a> or <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx" rel="nofollow">BackgroundWorker</a>

blocks|key|2107085|text|你应该检查BackgroundWorker类。它支持进程，并正确处理线程之间的通信。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2107086|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx^0|5|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]]]]

You should check <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx" rel="nofollow">BackgroundWorker</a> class. It supports progress and handles communication between threads properly.

blocks|key|1364436|text|您可以像这样启动一个新线程：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1364437|Thread+t1+=+new+Thread(methodnametocall);
+++t1.start();

void+methodnametocall()
{
+++this.Invoke((MethodInvoker)delegate
+++{

++++++++control+to+update;
++++}
});|code-block|syntax|javascript|1364438|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 would start a new thread as such:

<pre><code>Thread t1 = new Thread(methodnametocall);
 t1.start();

void methodnametocall()
{
 this.Invoke((MethodInvoker)delegate
 {

 control to update;
 }
});
</code></pre>

blocks|key|25507|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|25508|progressBar1.Minimum+=+0;
progressBar1.Maximum+=+Results.Count;

foreach+(MyClass+cls+in+Results)
{
++++ThreadPool.QueueUserWorkItem((o)+=>
+++++++++++++{
+++++++++++++++++progressBar1.Dispatcher.BeginInvoke(
+++++++++++++++++++++(Action)+(()+=>+progressBar1.Value+%2B=+1));
+++++++++++++++++cls.GetHistoryData();
+++++++++++++});
}|code-block|syntax|javascript|25509|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|$]]

try this

<pre><code>progressBar1.Minimum = 0;
progressBar1.Maximum = Results.Count;

foreach (MyClass cls in Results)
{
 ThreadPool.QueueUserWorkItem((o) =&gt;
 {
 progressBar1.Dispatcher.BeginInvoke(
 (Action) (() =&gt; progressBar1.Value += 1));
 cls.GetHistoryData();
 });
}
</code></pre>

blocks|key|25523|text|您链接到的文章是一个winforms示例，但是您正在制作一个WPF应用程序。在您的示例中，应该考虑改用通过控件的Dispatcher属性获得的Dispatcher类。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|25524|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcherobject.dispatcher.aspx|1|http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.aspx^0|1K|A|1Z|A|1K|A|0|1Z|A|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]|$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]|N|$5|I|J|K|E|$L|O]]]]

The article you link to is a winforms example, but you are making a WPF application. In your case, you should look into using the <a href="http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcher.aspx" rel="nofollow"><code>Dispatcher</code></a> class instead, that you get through the <a href="http://msdn.microsoft.com/en-us/library/system.windows.threading.dispatcherobject.dispatcher.aspx" rel="nofollow"><code>Dispatcher</code></a> property of the control.

I have the following code:

<pre><code> progressBar1.Minimum = 0;
 progressBar1.Maximum = Results.Count;

 foreach (MyClass cls in Results)
 { 
 progressBar1.Value += 1;

 // Go to DB and get large quantity of data
 cls.GetHistoryData();

 }
</code></pre>

What I’d like to do is shift the processing to another thread so that progressBar1 updates correctly. I’ve found an <a href="http://twigstechtips.blogspot.com/2008/08/c-threading-update-progress-bar.html" rel="nofollow">article</a> that implies that I should be able to use the Invoke method on the progress bar, but there doesn’t appear to be one.

Updating UI while running task

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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我有以下代码：        progressBar1.Minimum = 0;        progressBar1.Maximum = Results.Count;        foreach (MyClass cls in Results)        {                              progressBar1.Value += 1;            

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