Convert C# Lambda to vb.net

Question

Need Help in converting this to VB.NET

   public void GetCustomers(Action<IEnumerable<Customer>> onSuccess, Action<Exception> onFail)
    {
        Manager.Customers.ExecuteAsync(op =>
              {
                  if (op.CompletedSuccessfully)
                  {
                      if (onSuccess != null) 
                          onSuccess(op.Results);
                  }
                  else
                  {
                      if (onFail != null)
                      {
                          op.MarkErrorAsHandled();
                          onFail(op.Error);
                      }
                  }
              }
           );
    }

Note, there is no multi line anonymous delegate (lambda) support for VB 9 — Jeff
– Jeff, Commented Jan 2, 2011 at 8:19
Am I hallucinating? I do this at work often. Let me go look it up. — Antoine Latter
– Antoine Latter, Commented Jan 2, 2011 at 8:27

Antoine Latter · Accepted Answer · 2011-01-02 08:36:11Z

1

You can do in-line anonymous functions/subs with syntax like:

Manager.Customers.ExecuteAsync( Sub (op)
                                  If op.CompletedSuccessfully Then
                                    ...
                                  Else
                                    ...
                                  EndIf
                                End Sub )

Sometimes things get really flakey when you use it inline, so when that happens I give the local sub/function a name:

Dim SomeFun as Action(Of OpType) = Sub (op)
                                     ...
                                   End Sub

This works well because you can still close over your lexical environment.

This is all from memory - I don't have VS at home (and I try not to troll SO at work). In particular, I'm not sure I have my closing paren in the right place.

MSDN Reference

answered Jan 2, 2011 at 8:36

Antoine Latter

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3 Comments

Joven Over a year ago

Thanks for the response. But I'm still having overload resolution error.

Joven Over a year ago

I've finally found the error on the overloaded method. Thanks for the help

supercat Over a year ago

Does VB always generate a new delegate each time inline anonymous methods are used, or can an inline method that doesn't use "Me" (explicitly or implicitly) be kept as a single delegate shared by the class?

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