.Net Bitmap class constructor (int, int) and (int, int, PixelFormat) throws ArgumentException on perfectly good arguments

Question

I have some code that does something like this (Irrelevant bits snipped):

void foo(Bitmap bmp1, Bitmap bmp2)
{
    Bitmap bmp3;
    if(something)
        bmp         


        

Answer 1

Anyone have any ideas?

Wrap the call that is throwing ArgumentException with a try-catch(Exception ex) and step into the exception block to see the raw exception. It should give you more detail, like which argument is supposedly invalid.

try
{
    bmp3 = new Bitmap(bmp1.Width, bmp1.Height + bmp2.Height);
}
catch (Exception ex)
{   
    throw;  // breakpoint here, examine "ex"
}