c# - Task.Wait vs Task.RunSyncronously where task has call to WPF Dispatcher.Invoke -


I have a task that I'm starting and ending in the WPF app I want to wait. Inside this work I call a verb on the dispatcher.

If I Tasks. I use. Waiting () It appears that the method has never expired. In addition, breakpoints inside the dispatcher Invoke never hits.

If I Tasks. I use. Sensational () This works correctly and breakpoints are hit within the dispatcher.

Why is there any difference?

Sample the code below: 

  Public Zero ExampleMethod () {// Following: var work = New workload (LoadStuff); // It never returns: Work. Start (); Task.Wait (); // This version, however, does: task.RunSyncronously (); } Private Zero LOADSTOFF () {Observable Collection & lt; StuffObj & gt; Accessories = materials. Lod (arg1, true); Dispatch Helper.RunOnDispTouch ((= = {...}); } Public Static Class Dispatches {Public Static Zero Runon Dispatcher (Action Action) {Application.Server.Dispactor. Invoke (action); }}    
 
 
 Yes, a big difference is if you  RunSyncronously  You only run the work in the UI thread. If you start it in a background thread and we have  wait  then the code is running in the background thread and the UI thread is blocked if the code is being applied to the UI thread within that function, and the UI Blocking the thread (from  waiting ), you have created a detention, and the app will remain stable.  
 Note that if you have used,  run synchronousrescreens  is from a non-UI thread on that task, and the UI thread is being blocked by something else You will still see the deadlock.  
 Now, what you should do, here are actually two options:  
     
  1.  
     This task does not really take a long time, Instead of a background thread, the UI Thread UI thread will not be temporarily (temporarily) to stabilize so that it can all work directly in the UI. If this is the case, then maybe you should not even do this work, just put the code into a method and call the method.   
  2.  
     The task takes a long time to run, and then it updates the UI after doing that work. If this is the case then it is important that this  RunSyncronously  but not in the background thread. To prevent your entire application from deadlock, this will mean that you have to block  not  the UI thread through the   call. If you have some code that you want to run after the work is done, then what do you have to do, add continuity to the job. C # 4.0 can be done by calling this service on  on  and adding it to a delegate to run. In C # 5.0+ you can do  wait  instead of related tasks (instead of  waiting  ing, which is actually a big difference) and it will automatically be used for the remainder Wired up will give you the method of continuing to run as a continuation (in fact it is a clear  continue  syntax for the call, but it is very useful).

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