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DrawToBitmap - System.ArgumentException: parameter is not valid

Im creates Label, and sometimes Im uses .DrawToBitmap(). I don’t know why, but after I run my program for a while (and often calling .DrawToBitmap()), I get an exception:

System.ArgumentException: Parameter is not valid.
   at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
   at System.Drawing.Bitmap..ctor(Int32 width, Int32 height)

Somehow I can not often call this function. If I strongly tried this:

while(true)
{

  System.Windows.Forms.Label label = new Label();

  label.Font = new Font("Arial", 20);
  label.Text = "test";

  try
  {
    Bitmap image = new Bitmap(300, 500);
    label.DrawToBitmap(image, label.ClientRectangle);
  }
  catch (Exception e)
  {
    Console.WriteLine(e);
  }
}

I received an exception after 5-6 seconds (1000-2000 calls). What is the problem? How to avoid this?

Edit: Thank you guys for the idea with Dispose()- somehow everything works fine if I use it on Label. Even if I do not use it in Bitmap, that’s fine. Both answers are great, I can only accept 1 of them :(

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2 answers

, GDI + . , :

 label.Font = new Font("Arial", 20);

Font IDisposable, Dispose(). Bitmap. , GDI .

. , Font Bitmap, using. , GDI , , .

, , , Dispose() , ( , ). , using, Dispose() , :

using(var b = new Bitmap(w, h))
{
    // use 'b' for whatever
} // b.Dispose() is called for you
+6

GDI + , . , . , . , .

Dispose() . , . Bitmap, , , . , .

, , :

using (Bitmap image = new Bitmap(300, 500)) {
    label.DrawToBitmap(image, label.ClientRectangle);
}
+4

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