从BackgroundWorker的线程访问UI控件 - C＃ [英] Accessing UI Control from BackgroundWorker Thread - C#

问题描述

我有我的Windows窗体上按钮调用的RunWorkerAsync（）方法，这反过来执行一个动作，然后更新同一窗体上的列表框。

I have a button on my windows form that calls the RunWorkerAsync() method, this in turn performs an action which then updates a ListBox on the same form.

在该事件的DoWork完成我分配事件的结果（这是一个列表），我处理RunWorkerCompleted（）事件，然后执行以下code更新我的列表框

After the DoWork event has finished I assign the Result for the event (Which is a list), I process the RunWorkerCompleted() event and then perform the following code to update my Listbox

调用该：

（道歉，code格式无效）

(Apologies, code formatting won't work)

现在，当我运行应用程序和preSS刷新按钮，会出现以下异常：

Now when I run the application and press the refresh button the following exception appears:

我将如何解决这个问题？

How would I get around this?

谢谢！

编辑：

该例外被扔在如下因素的语句，这发生在DoWork的方法，我清楚的内容，以保持清单的更新;

The exception is thrown on the folowing statement, this occurs in the DoWork method where I clear the contents to keep the list up to date;

listBoxServers.Items.Clear（）;

推荐答案

下面是我觉得这非常方便的一个片段：

Here's a snippet which I find very handy:

public static void ThreadSafe(Action action)
{
    Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Normal, 
        new MethodInvoker(action));
}

您可以通过它行动任何代表键入或只是一个lambda是这样的：

You can pass it any delegate of Action type or simply a lambda like this:

ThreadSafe(() =>
{
    [your code here]
});

或

ThreadSafe(listBoxServers.Items.Clear);

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