no overload for matches delegate system eventhandler

Question

As I m pretty new to C   I struggle with the following piece of code  When I click to button  knop   the method  klik  has to be executed  The method has to draw the Bitmap  b   generated by  DrawMandel  on the form  But I constantly get the error  no overload for matches delegate  system eventhandler    using System  using System Windows Forms  using System Drawing   class Mandelbrot   Form        public Bitmap b      public Mandelbrot                  Button knop          knop   new Button                    knop Location   new Point 370  15                   knop Size   new Size 50  30           knop Text    OK                    this Text    Mandelbrot 1 0           this ClientSize   new Size 800  800           knop Click    this klik          this Controls Add knop                       public void klik PaintEventArgs pea  EventArgs e            Bitmap c   this DrawMandel            Graphics gr   pea Graphics          gr DrawImage b  150  200             public Bitmap DrawMandel                   function that creates the bitmap         return b            static void Main             Application Run new Mandelbrot

User · Answer

Yes there is a problem with Click event handler (klik) - First argument must be an object type and second must be EventArgs.

public void klik(object sender, EventArgs e) {
  //
}

If you want to paint on a form or control then use CreateGraphics method.

public void klik(object sender, EventArgs e) {
    Bitmap c = this.DrawMandel();
    Graphics gr = CreateGraphics();  // Graphics gr=(sender as Button).CreateGraphics();
    gr.DrawImage(b, 150, 200);
}

User · Answer

Change the klik method as follows   public void klik object pea  EventArgs e        Bitmap c   this DrawMandel        Button btn   pea as Button      Graphics gr   btn CreateGraphics        gr DrawImage b  150  200

User · Answer

You need to change public void klik PaintEventArgs pea  EventArgs e  to public void klik object sender  System EventArgs e  because there is no Click event handler with parameters PaintEventArgs pea  EventArgs e

User · Answer

You need to wrap button click handler to match the pattern    public void klik object sender  EventArgs e

[c#] no overload for matches delegate 'system.eventhandler'

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