Update control asynchronously

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I've been reading over the internet how to solve the problem of updating controls from different threads than the one that contains the control and also read "Pro VB 2010 and the .Net 4.0 Platform" and I start to wonder. Is the following code performing in synchronous fashion?

Private Sub SaveData(ByVal filepath As String)
   If InvokeRequired Then
      Me.Invoke(New MethodInvoker(AddressOf SaveData))
   Else
      ... the actual code
   End If
End Sub

It depends widely on your calling context.

If you are calling it from the UI thread or your main thread, then yes it will function synchronously.

If you call it from a thread that is not your UI or main thread, then it is going to function asynchronously to your UI or main thread, but synchronously with the calling thread, waiting until the UI or main thread is done processing the delegate.

So it can go both ways. It can operate synchronously and asynchronously. I think what you are missing is that the code itself does not preform in a synchronous or asynchronous fashion, the execution of the code is either synchronous or asynchronous.

The reason why you make an update function:

Private Sub UpdateLabel(byval tLabel as Label, byval Value as String)
    If tLabel.Invokerequired Then
         Me.Invoke(New MethodInvoker(AddressOf UpdateLabel)
    Else
        tLabel.Text = Value
    End If
End Sub

Is so that you can call it whenever you want to change the text, without having to worry about a cross thread exception.

This method would be safe to call from the UI thread during a click event and it would also be safe to call from a along running background thread, because the change would still only ever be made on the UI or Main thread. You use code like this to ensure synchronicity with your changes to controls owned by other threads.

This style of updating is meant to synchronize your changes and avoid cross threading.

Asynchronous Control Updates In C#/.NET/WinForms � Los Techies, It was a Monday. It's a simple extension method that allows any UI control to update itself when called from an asynchronous method – whether it's running from a . BeginInvoke() call, a BackgroundWorker, a ThreadPool thread, or any other form of asynchronous call. You should use Invoke method of Control. It executes some code in Control's thread. It executes some code in Control's thread. Also you can check InvokeRequired property to check if you need to call Invoke method (it checks if the caller is on a different thread than the one the control was created on).


The Invoke method is a synchronous call that will block the calling thread until the delegate finishes executing on the UI thread.

If you want to calling thread to continue immediately (before the code on the UI thread runs), call BeginInvoke(), which is asynchronous.

Using Async and Await to update the UI Thread – Stephen Haunts , In a previous article on async and await, I showed a very simple is used for controlling the time interval of an update back to the UI thread. It’s a simple extension method that allows any UI control to update itself when called from an asynchronous method – whether it’s running from a .BeginInvoke() call, a BackgroundWorker, a ThreadPool thread, or any other form of asynchronous call. It’s simple and effective in managing UI updates from asynchronous methods.


I know this question is a little old, but here's a modification of Pow-Ian's answer that worked for me.

Private Sub UpdateLabel(ByVal tControl As Control, ByVal Value As String)
    If tControl.InvokeRequired Then
        tControl.Invoke(Sub() tControl.Text = Value)
    Else
        tControl.Text = Value
    End If
End Sub

This should work to change the text for any control using the UI thread, even if it is called from an async method.

ScriptManager.RegisterAsyncPostBackControl(Control) Method , Registers a control as a trigger for asynchronous postbacks. to register a Button control so that it causes an update of an UpdatePanel control's content. However, with the update panel and timer on the page, then even after the calendar control is displayed, the OnDayRender method continues to fire. The asychronous postback from the timer/update panel must be having an effect on the calendar control, but it shouldn't. As you can see, the calendar control isn't even inside the update panel.


Asynchronous programming, private readonly HttpClient _httpClient = new HttpClient(); downloadButton. Clicked += async (o, e) => { // This line will yield control to the UI as� The SynchronizationContext class is a class belonging to the .NET Framework’s System.Threading namespace. The purpose of this class is to provide a model to make communication between threads easier and more robust. Then we also have a private DateTime which is used for controlling the time interval of an update back to the UI thread. The


Asynchronous Mode | WinForms Controls, Returns a list of records used to calculate summary values for all cells asynchronously. Control Update. Method, Description. PivotGridControl. Updates generated by batch-input sessions are always carried out synchronously. A batch-input with CALL TRANSACTION USING can also update synchronously or may update asynchronously. Finally, every 100th update in a background job is carried out synchronously. This helps to prevent the update system from falling behind in processing updates.


Asynchronous Windows Forms Programming, As a result, the completion callback method should never update the user interface directly because that would be calling a Windows Forms form or control on a� Auto Update Statistics Asynchronously (AUTO_UPDATE_STATISTICS_ASYNC =TRUE) This option does the same thing as the above, but with one significant difference. It allows the Optimizer to run a query and then use the updated the statistics.