Tuesday, May 3, 2011

Migrating Handles from VB.NET to C#

Hi, I'm migrating some code from VB.NET to C# (3.5).

I find structurs like:

Public Event DataLoaded(ByVal sender As Object, ByVal e As EventArgs)

Protected Sub Mag_Button_Load_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Mag_Button_Load.Click
[..]
        RaiseEvent DataLoaded(Me, EventArgs.Empty)
End Sub
[..]

'Other Class
Private Sub LoadData(ByVal sender As Object, ByVal e As System.EventArgs) Handles oData.DataLoaded
[..]
End Sub

What is the most streight-forward to translate such behavour in C#? Thanks

From stackoverflow
  • I recommend using the Telerik Code Converter as a start.

    C# does not have that easy automatic attaching of event handlers by means of the "Handles" keyword like VB.NET does.

    //EventHandler declaration
    public event EventHandler  DataLoaded;
    protected void Mag_Button_Load_Click(object sender, EventArgs e)
    {
    
        //Raise Event
        if (DataLoaded != null) {
         DataLoaded(this, EventArgs.Empty);
        }
    }
    

    Also, You need to assign your event handlers to the objects like this:

    Button1.Click += Button1_Click;
    
    protected void Button1_Click(object sender, EventArgs e)
    {
      //do something.
    }
    

    However C# does have the succinct ability of doing this as well:

    Button1.Click += (sender, e)=>
    {
        //do something
    }
    
    Jon Skeet : I think you've either forgotten the => for a lambda expression in the last piece of code (or the delegate keyword and parameter types for an anonymous method).
    Jose Basilio : @Jon - Thank you for the correction!

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