问题描述
我的 Windows 窗体上有一个按钮调用 RunWorkerAsync() 方法,这反过来执行一个操作,然后更新同一窗体上的 ListBox.
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 DoWork 事件完成后,我为事件分配结果(这是一个列表),我处理 RunWorkerCompleted() 事件,然后执行以下代码来更新我的列表框
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
调用这个:
(抱歉,代码格式不起作用)
(Apologies, code formatting won't work)
现在,当我运行应用程序并按下刷新按钮时,出现以下异常:
Now when I run the application and press the refresh button the following exception appears:
我该如何解决这个问题?
How would I get around this?
在以下语句中抛出异常,这发生在 DoWork 方法中,我清除内容以保持列表最新;
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
这是我觉得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));
}
您可以将任何 Action
类型的委托或简单的 lambda 传递给它,如下所示:
You can pass it any delegate of Action
type or simply a lambda like this:
ThreadSafe(() =>
{
[your code here]
});
或
ThreadSafe(listBoxServers.Items.Clear);
这篇关于从 BackgroundWorker 线程访问 UI 控件的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!