WPF thread & mdash; Dispatcher, wpfdispatcher

WPF thread -- Dispatcher, wpfdispatcher

When developing using WPF, you often encounter cross-thread problems caused by the need to update the UI content of the created thread.

Exception content:

Exception type: System. InvalidOperationException

Exception description:

"System. InvalidOperationException" type unprocessed exception occurs in WindowsBase. dll

Other information: The Calling thread cannot access this object because another thread owns this object.

This. Dispatcher. Invoke (new Action () =>{// Do Something // update UI operation}); Thread. Sleep (100 );

 

2. Use the Dispatcher of the Control. [in WPF, the control inherits from DispatcherObject]

If (! This. pb_test.Dispatcher.CheckAccess () {// update the UI interface this. pb_test.Dispatcher.Invoke (DispatcherPriority. normal, new UpdateProgressBarDelegate (int progress) => {this. pb_test.Value = progress;}), I); Thread. sleep (100 );}

 

3. Use Dispatcher of the current form

if (!Dispatcher.CheckAccess()){Dispatcher.Invoke(DispatcherPriority.Normal,new UpdateProgressBarDelegate((int progress) => {this.pb_test.Value = progress;}),i);Thread.Sleep(100);}

 

Project hosting address: https://wpfthread.codeplex.com/