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c#.netvb.netbegininvoke
Breeze
Breeze

Reputation: 2058

How to use BeginInvoke in VB.NET

In C# you use BeginInvoke like this: 

obj.BeginInvoke((Action)(() =>
{
    //do something
}));

I tried to translate it to VB.NET, and ended up with this code, that seems to work: 

obj.BeginInvoke(
    Sub()
        'do something'
    End Sub
)

The snippets look very different to me, especially because the (Action) (() => part is missing completely. Is this the correct way to use BeginInvoke in VB.NET?

this is not a duplicate of How to use BeginInvoke C# because the question and every answer uses C# (if any programming language is used). C#-code doesn't help much when you are unsure about if you used the correct VB.NET syntax.

Upvotes: 4

Views: 7780

Answers (2)

Visual Vincent
Visual Vincent

Reputation: 18310

(Action) just casts the lambda to an Action, which isn't needed in VB.NET. The Sub() lambda is all you need.

You have got the correct conversion.

Although note that BeginInvoke() must be followed by EndInvoke(), otherwise you will get thread leaks.

Upvotes: 3

Jeremy Thompson
Jeremy Thompson

Reputation: 65594

Yes, the (Action) (() => doesn't return anything so Sub in VB.Net is equivalent. It'd be a Func in C# if it did return something.

Upvotes: 1

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