Question

Performance question : Control.Invoke

Asked by: Dnx_7

Hi experts

i'm using a lot of delegate with threads for accessing control in the main thread
however, i would like to know if it is better to use

if ME.Invokerequired then
ME.begininvoke(...)
else...

=> i use this instruction when i need to modify more than one control

in the case that i need to only need to synchronize one control then i use :

if myListbox.InvokeRequired then
myListbox.BeginInvoke(...)
else

if myCheckBox.InvokeRequired then
myCheckBox.BeginInvoke(...)
else

etc...

does it change something between the two methods ? (using ME.invoke or myControl.begininvoke)

Any explanations are welcome

ps : sorry for my english


Thank you,

Kind Regards.

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Asked On
2009-08-06 at 02:22:02ID24630740
Tags

.NET 2.0

,

Microsoft

,

performance

,

invoke

Topics

.NET Framework 2.x

,

.NET

,

Visual Basic Programming

Participating Experts
2
Points
125
Comments
7

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Answers

 

by: sirahPosted on 2009-08-06 at 05:59:30ID: 25032701

 

by: Dnx_7Posted on 2009-08-06 at 06:24:23ID: 25032980

It doesn't explain the difference between me.invoke or control.invoke

maybe it is the same... and did the same thing?

 

by: Idle_MindPosted on 2009-08-06 at 11:28:29ID: 25036514

ALL controls run in the SAME UI thread so you can just check against the Form (ME) itself ONCE and then do all of the updates in the same block:

    Private Sub Foo()
        If Me.InvokeRequired Then
            Me.Invoke(Foo) ' <--- not correct syntax: Recursively call Foo()
        Else
            ' Update MULTIPLE controls in here:
            myListBox...
            myCheckBox...
            mySomethingElse....
        End If
    End If

 

by: Dnx_7Posted on 2009-08-06 at 14:26:42ID: 25038248

Thank you Idle_mind for your response

so if i understand :

Private Sub Foo()
        If Me.InvokeRequired Then
            Me.Invoke(Foo) ' <--- not correct syntax: Recursively call Foo()
        Else
            ' Update MULTIPLE controls in here:
            myListBox...
            myCheckBox...
            mySomethingElse....
        End If
    End If

is the same (performance level) as

(if i only want to update one control for example)

Private Sub Foo()
        If myControl.InvokeRequired Then
            myControl.Invoke(delegate... addressof...)
        Else
           myControl. (update myControl here)
        End If
    End If


am i right?


Regards.

 

by: Idle_MindPosted on 2009-08-06 at 14:31:46ID: 25038288

That's correct.

 

by: Idle_MindPosted on 2009-08-06 at 14:40:38ID: 25038364

Here's a different way to do threading that some have found easier to deal with...   =)

Public Class Form1
 
    Private SC As System.Threading.SynchronizationContext = System.Windows.Forms.WindowsFormsSynchronizationContext.Current
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Button1.Enabled = False
        Dim T As New System.Threading.Thread(AddressOf Worker)
        T.IsBackground = True
        T.Start()
    End Sub
 
    Private Sub Worker()        
        For i As Integer = 1 To 10
            SC.Post(New System.Threading.SendOrPostCallback(AddressOf NewListItem), "Item #" & i)
            System.Threading.Thread.Sleep(500)
        Next
        SC.Post(New System.Threading.SendOrPostCallback(AddressOf ThreadDone), Nothing)
    End Sub
 
    Private Sub NewListItem(ByVal state As Object)
        Me.ListBox1.Items.Add(state)
    End Sub
 
    Private Sub ThreadDone(ByVal state As Object)
        Me.Button1.Enabled = True
    End Sub
 
End Class
                                              
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by: Dnx_7Posted on 2009-08-07 at 00:44:48ID: 25040574

Thank you very much Idle_Mind!

Nice example, i guess that is the most generic way to synchronize from any thread to the main thread (cft WCF... invokerequired do not work...)

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