I was investigation my colors problem and I noticed this printed to my
console window:
"Gtk colorscheme read failure, using built-in colorscheme"
I investigated that code and found a probably bug. In the file
mcs/class/Managed.Windows.Forms/System.Windows.Forms/Theme.cs there is
this function, starting near line 207:
private void SetSystemColors(KnownColor kc, Color value)
{
if (update == null)
{
Type known_colors = Type.GetType("System.Drawing.KnownColors," +
Consts.AssemblySystem_Drawing);
if (known_colors != null)
{
update = known_colors.GetMethod("Update", BindingFlags.Static
| BindingFlags.Public);
}
}
if (update != null)
{
update.Invoke (null, new object[2] { (int)kc, value.ToArgb() });
}
}
Which uses reflection to invoke the KnownColors.Update method. In the
last line the "Color.ToArgb()" function returns an int. However, the
function signature of Update is:
public static void Update (int knownColor, uint color)
{
ArgbValues[knownColor] = color;
}
Which expects a uint as the second parameter, not an int. This throws a
System.ArgumentException. I verified that if the last line of
SetSystemColors is changed to
if (update != null)
{
update.Invoke (null, new object[2] { (int)kc,
(uint)value.ToArgb() });
}
Then the exception no longer happens, and the warning is no longer
printed to my console window when launching mono apps.
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