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    <p>Here it is in VB.net, very similar to Samuel's answer. I have four overloads depending on whether you want a subroutine or function and whether or not there's a parameter. It would be easy to add more overloads for more parameters. VB.Net is able to infer the types.</p> <pre><code>Module ISynchronizeInvokeExtensions Public Delegate Function GenericLambdaFunctionWithParam(Of InputType, OutputType)(ByVal input As InputType) As OutputType Private Delegate Function InvokeLambdaFunctionCallback(Of InputType, OutputType)(ByVal f As GenericLambdaFunctionWithParam(Of InputType, OutputType), ByVal input As InputType, ByVal c As System.ComponentModel.ISynchronizeInvoke) As OutputType Public Function InvokeEx(Of InputType, OutputType)(ByVal f As GenericLambdaFunctionWithParam(Of InputType, OutputType), ByVal input As InputType, ByVal c As System.ComponentModel.ISynchronizeInvoke) As OutputType If c.InvokeRequired Then Dim d As New InvokeLambdaFunctionCallback(Of InputType, OutputType)(AddressOf InvokeEx) Return DirectCast(c.Invoke(d, New Object() {f, input, c}), OutputType) Else Return f(input) End If End Function Public Delegate Sub GenericLambdaSubWithParam(Of InputType)(ByVal input As InputType) Public Sub InvokeEx(Of InputType)(ByVal s As GenericLambdaSubWithParam(Of InputType), ByVal input As InputType, ByVal c As System.ComponentModel.ISynchronizeInvoke) InvokeEx(Of InputType, Object)(Function(i As InputType) As Object s(i) Return Nothing End Function, input, c) End Sub Public Delegate Sub GenericLambdaSub() Public Sub InvokeEx(ByVal s As GenericLambdaSub, ByVal c As System.ComponentModel.ISynchronizeInvoke) InvokeEx(Of Object, Object)(Function(i As Object) As Object s() Return Nothing End Function, Nothing, c) End Sub Public Delegate Function GenericLambdaFunction(Of OutputType)() As OutputType Public Function InvokeEx(Of OutputType)(ByVal f As GenericLambdaFunction(Of OutputType), ByVal c As System.ComponentModel.ISynchronizeInvoke) As OutputType Return InvokeEx(Of Object, OutputType)(Function(i As Object) f(), Nothing, c) End Function End Module </code></pre> <p>Usage (run this in a backgroundworker):</p> <pre><code> InvokeEx(Sub(x As String) Me.Text = x, "foo", Me) 'set form title to foo InvokeEx(AddressOf MsgBox, Me.Text, Me) InvokeEx(Sub() Me.Text &amp;= "!", "foo", Me) 'append "!" to form title InvokeEx(AddressOf MsgBox, Me.Text, Me) Dim s As String = InvokeEx(Function() Me.Text, Me) &amp; "bar" 'get form title to backgorundworker thread InvokeEx(AddressOf MsgBox, s, Me) 'display the string from backgroundworker thread </code></pre>
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    1. POBest Way to Invoke Any Cross-Threaded Code?
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    1. USEyal
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    1. COHi. I've have been using your code above with great success, but I tested my program on a few computers. It has worked correctly on most of the Win XP computers that I've tested it on, but on one of them I get the following error: "Commom Language Runtime detected an invalid program". Do you know how to solve this? I am using .NET framework V2.
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    2. COTry upgrading the CLR? I think that Sub lambda is supported only by .Net 4, before there there was only Function lambda.
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    3. COThat doesn't look similar to Samuel's answer to me. You are creating delegates. He uses Lambdas instead of delegates. I will post the VB code that i use in my own answer.
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      1. USShawn Kovac
 

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