CODEWITHSUNDEEP
c#vb.netanonymous-functioncode-translationbegininvoke
tmighty
tmighty

Reputation: 11409

Equivalent of C# BeginInvoke((Action)) in VB.NET

I need to convert the following C# code to VB.NET:

if (this.InvokeRequired)
{
    this.BeginInvoke((Action)(() =>
    {
        imageMutex.WaitOne();
        pbCamera.Image = (Bitmap)imageCamera.Clone();
        imageMutex.ReleaseMutex();
    }));
}

I have tried it like this:

If Me.InvokeRequired Then
    Me.BeginInvoke((Action)(Function()
        imageMutex.WaitOne()
        pbCamera.Image = CType(imageCamera.Clone(), Bitmap)
        imageMutex.ReleaseMutex()
   ))
End If

But the compiler tells me that Action is a type and can not be used as an expression. How would such a delegate by written in VB.NET?

Upvotes: -1

Views: 1281

Answers (1)

Caius Jard
Caius Jard

Reputation: 74700

The direct translation is:

    If Me.InvokeRequired Then
        Me.BeginInvoke(DirectCast(
            Sub()
                imageMutex.WaitOne()
                pbCamera.Image = DirectCast(imageCamera.Clone(), Bitmap)
                imageMutex.ReleaseMutex()
            End Sub, 
            Action)
        )
    End If

As others have pointed out, you don't need to cast a lambda to an Action:

    If Me.InvokeRequired Then
        Me.BeginInvoke(
            Sub()
                imageMutex.WaitOne()
                pbCamera.Image = DirectCast(imageCamera.Clone(), Bitmap)
                imageMutex.ReleaseMutex()
            End Sub
        )
    End If

https://codeconverter.icsharpcode.net had a good stab at converting this. Might be something to consider if youre doing a lot of work where you're finding the code you want in C# but snagging on a couple of aspects of the conversion

Upvotes: 3

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