WPF：调度程序处理已暂停，但仍在处理消息
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WPF : Dispatcher processing has been suspended, but messages are still being processed
提问by Amin Eshtiaghi
I Have a WPF Project, When i try to Run This Code On RowLoad Event I got below Error :
我有一个 WPF 项目，当我尝试在 RowLoad 事件上运行此代码时，出现以下错误：
private void ParentGridView_OnRowLoaded(object sender, EventArgs e)
{
try
{
if(((RadGridView)sender).Columns != null)
{
MessageBox.Show(((RadGridView)sender).Columns.Count.ToString(CultureInfo.InvariantCulture));
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Error : Dispatcher processing has been suspended, but messages are still being processed.
错误：调度程序处理已暂停，但仍在处理消息。
Note That the GridView Control is Telerik RadGridView
注意 GridView 控件是 Telerik RadGridView
回答by Dave Tillman
This answerdescribes the same situation as yours. (It references this answer on a different website).
这个答案描述了与您相同的情况。（它在不同的网站上引用了这个答案）。
The dispatcher processing is suspended to avoid reentrancy problems when updating the visual tree.
调度程序处理被暂停以避免更新可视化树时的重入问题。
If you really need to display a message box in response to your "Row Loaded" event, you need to defer the call using `Dispatcher.BeginInvoke().
如果你真的需要显示一个消息框来响应你的“Row Loaded”事件，你需要使用`Dispatcher.BeginInvoke()来推迟调用。
So, replace:
所以，替换：
MessageBox.Show(((RadGridView)sender).Columns.Count.ToString(CultureInfo.InvariantCulture));
with:
和：
var msg = ((RadGridView)sender).Columns.Count.ToString(CultureInfo.InvariantCulture);
Dispatcher.BeginInvoke(new Action(() => MessageBox.Show(msg)));
If this code is in a WPF object, then the Dispatcherproperty is available. Otherwise, you need to get it from somewhere else.
如果此代码位于 WPF 对象中，则该Dispatcher属性可用。否则，您需要从其他地方获取它。
