Passing Parameters using Invoke in multi-threaded app

[Phillip Taylor]

I'm having a problem with this code. I can't really understand why it
won't work if, for example, I pass in a linked list of 0 records.

Public Sub ConversionUpdat eComplete(ByRef records As LinkedList(Of
ListViewItem))
If (Me.InvokeRequi red) Then
Dim method As New MigrationComple teEventHandler( AddressOf
ConversionUpdat eComplete)
Me.Invoke(metho d, New Object() {records})
Else

lvUpdateSuggest ions.Items.Clea r()

For Each l As ListViewItem In records
lvUpdateSuggest ions.Items.Add( l)
Next

lvUpdateSuggest ions.View = True

pbConverting.Vi sible = False
lblConversionWa it.Visible = False
lblSuggestionNo tice.Visible = True
btnNext.Enabled = True
End If
End Sub

[Spam Catcher]

Re: Passing Parameters using Invoke in multi-threaded app

Phillip Taylor <Phillip.Ross.T aylor@gmail.com wrote in
news:1184690177 .951521.76660@g 12g2000prg.goog legroups.com:

I'm having a problem with this code. I can't really understand why it
won't work if, for example, I pass in a linked list of 0 records.

In anycase, what is happening in your app?

You should use BeginInvoke instead. Invoke may deadlock your app under
load.

Public Sub ConversionUpdat eComplete(ByRef records As LinkedList(Of
ListViewItem))
If (Me.InvokeRequi red) Then
Dim method As New MigrationComple teEventHandler( AddressOf
ConversionUpdat eComplete)
Me.Invoke(metho d, New Object() {records})
Else
>
lvUpdateSuggest ions.Items.Clea r()
>
For Each l As ListViewItem In records
lvUpdateSuggest ions.Items.Add( l)
Next
>
lvUpdateSuggest ions.View = True
>
pbConverting.Vi sible = False
lblConversionWa it.Visible = False
lblSuggestionNo tice.Visible = True
btnNext.Enabled = True
End If
End Sub
>
>

[Armin Zingler]

Re: Passing Parameters using Invoke in multi-threaded app

"Phillip Taylor" <Phillip.Ross.T aylor@gmail.com schrieb

I'm having a problem with this code. I can't really understand why
it won't work if, for example, I pass in a linked list of 0 records.

What does "won't work" mean? The code looks ok (although I don't know why
the arg is declared ByRef).

Public Sub ConversionUpdat eComplete(ByRef records As
LinkedList(Of ListViewItem))
If (Me.InvokeRequi red) Then
Dim method As New MigrationComple teEventHandler( AddressOf
ConversionUpdat eComplete)
Me.Invoke(metho d, New Object() {records})
Else
>
lvUpdateSuggest ions.Items.Clea r()
>
For Each l As ListViewItem In records
lvUpdateSuggest ions.Items.Add( l)
Next
>
lvUpdateSuggest ions.View = True
>
pbConverting.Vi sible = False
lblConversionWa it.Visible = False
lblSuggestionNo tice.Visible = True
btnNext.Enabled = True
End If
End Sub
>

Armin

[Michel Posseth [MCP]]

Re: Passing Parameters using Invoke in multi-threaded app

I have seern lots of strange behavior of .net apps when used byref
parameters , as i also do not see the point why it should be passed byref in
this case , i recomend you to declare the parameter byval and try again it
might / or might not solve your problem :-)


Regards

Michel Posseth


"Armin Zingler" <az.nospam@free net.deschreef in bericht
news:%23LkqBaJy HHA.4672@TK2MSF TNGP02.phx.gbl. ..

"Phillip Taylor" <Phillip.Ross.T aylor@gmail.com schrieb

>I'm having a problem with this code. I can't really understand why
>it won't work if, for example, I pass in a linked list of 0 records.

>
What does "won't work" mean? The code looks ok (although I don't know why
the arg is declared ByRef).
>

> Public Sub ConversionUpdat eComplete(ByRef records As
>LinkedList(O f ListViewItem))
> If (Me.InvokeRequi red) Then
> Dim method As New MigrationComple teEventHandler( AddressOf
>ConversionUpda teComplete)
> Me.Invoke(metho d, New Object() {records})
> Else
>>
> lvUpdateSuggest ions.Items.Clea r()
>>
> For Each l As ListViewItem In records
> lvUpdateSuggest ions.Items.Add( l)
> Next
>>
> lvUpdateSuggest ions.View = True
>>
> pbConverting.Vi sible = False
> lblConversionWa it.Visible = False
> lblSuggestionNo tice.Visible = True
> btnNext.Enabled = True
> End If
> End Sub
>>

>
>
Armin