GuerreroTook GuerreroTook

Jan 23, 2007 at 2:41 PM

I'm a dot net developer, and i have a problem with anonymous methods i used i this code.

void OnTituloCambio(object sender, EventArgs e)

{

SuspendLayout();

if (InvokeRequired)

{

WaitCallback w = delegate(object o)

{

Text = gestor.Titulo;

};

Invoke(w);

}

else

{

Text = gestor.Titulo;

}

ResumeLayout();

}

But sometimes the application thow me a NullRefererenceException in Invoke(w), and the stack is in there,
   at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
   at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
   at System.Windows.Forms.Control.Invoke(Delegate method)
   at AlbumFotografico.Principal.OnTituloCambio(Object sender, EventArgs e) in C:\csharp\02\AlbumFotografico\Principal.cs:line 450.
So what happend here, whan i'm doing wrong?
Thanks a lot. Luis.
LostInTangent

Jan 24, 2007 at 4:27 PM

Why exactly are you using the anonymous method? I don't see the benefit in using the Invoke statement in this context.
GuerreroTook GuerreroTook

Jan 25, 2007 at 2:27 PM

LostInTangent wrote:

Why exactly are you using the anonymous method? I don't see the benefit in using the Invoke statement in this context.

Because anonymous method enables me to set the Text property in the same context, and for each property than i have to set asynchronously i have to got a delegate / method, and anonymous method is so fast. But my problem is so bad because i tried to use without anonymous method and doesn't work.
nightski

Jan 28, 2007 at 2:55 PM

Is it possible this is being called before gester is initialized?

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Problem with anonymous methods in C#

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