我在这RelayCommand与UI刷新问题:UI线程不清爽的预期为WPF形式
private RelayCommand _DeleteReferenceCommand;
public RelayCommand DeleteReferenceCommand
{
get
{
return _DeleteReferenceCommand ?? (_DeleteReferenceCommand = new RelayCommand(
() =>
{
//the 2 next lines trigger properties that will modify some components Visibility on the view
ReferencesGridWithPicsUC.TextReplacingGridView = "Deleting the reference. Please wait...";
ReferencesGridWithPicsUC.GridViewVisibility = false;
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor; // mouse cursor change
//using multi-threading so that UI updates while a long process takes place in the background
Task.Run(() =>
{
Application.Current.Dispatcher.Invoke((new Action(() =>
{
System.Threading.Thread.Sleep(3000); // simulates a long process
ReferencesGridWithPicsUC.GridViewVisibility = true; // Sets the UI controls visibility back to previous state
System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Hand; // Mouse cursor back to previous value
}
)));
}
);
},
() => { return ReferencesGridWithPicsUC.SelectedReference != null; }
));
}
}
具体而言,当我启动应用程序并运行的抗冻这个时间码,它可以作为预期的(鼠标光标和控件在Sleep(3000)之前按预期更新并在之后恢复正常。当代码再次执行时,我可以看到该属性已正确更新GridViewVisibility。但UI不再刷新:控件GridViewVisibility更改触发的可见性不会更新,另一方面鼠标光标不断更新,如预期的那样。如果有人可以解决这个血腥的难题,我会在你的债务;)
您在线程池中启动任务,然后立即将所有工作编组到UI线程,从而在整个持续时间内将其阻塞。没有什么是在后台执行的,所以你遇到UI冻结问题并不令人惊讶。 –