Namespaces and visibility.

[CornedBee]

I'm trying to derive my own class from System.Drawing.Image which represents a bitmap stored in a DirectDraw offscreen surface.

But when I compile it gives me the error
'System.Drawing.Image.Image()' is inaccessible due to its protection level
for every constructor of my class.

Now I would normally guess that this means the constructor is protected, internal or private. But:
It can't be protected, my derived class would have access to it.
It can't be private, else no class could be derived from Image (there's no friend keyword in C#, right?).
It can't be internal, because a) I placed my image class in System.Drawing and b) System.Drawing.Imaging.Metafile is derived from Image and has access.

Why does it deny me the access? How can I solve this problem?

public class DdImage : System.Drawing.Image
{
	//...
	public new int Flags
	{
		get
		{
			return 0;
		}
	}

	public new Guid[] FrameDimensionsList
	{
		get
		{
			return null;
		}
	}
	// etc.
}

[DevGrp]

Because System.Drawing.Image is an abstract class.

[CornedBee]

I know that. I'm deriving from it. I never call any Image constructor explicitly. But the compiler gives me errors!

[CornedBee]

Ok, as it is I'll assume Image is somehow guarded in it's namespace (still seems strange to me).

Damn, that would have been nice.

[hellswraith]

You might want to use the Bitmap class instead. I think there is the same functionality and you can create an instance of it.

[PT Exorcist]

public new int Flags
	{
		get
		{
			return 0;
		}
	}

what does this do? proprieties aren't in the format of:
<access> <type> <name> ? what does the new do?

[kovan]

this MIGHT help...

http://radio.weblogs.com/0111551/sto...ctClasses.html

[DevGrp]

what does this do? proprieties aren't in the format of:
<access> <type> <name> ? what does the new do?

The new keyword is there to hide a member with the same name in the base class.

[CornedBee]

Yep, it won't allow me nothing, it won't allow me override, so I have to use new.

Bitmap does too much of its own. I don't want it allocating memory behind my back.

[CornedBee]

Originally posted by kovan
this MIGHT help...

http://radio.weblogs.com/0111551/sto...ctClasses.html

Thanks, but it didn't.

[CornedBee]

Could it be that I have to implement ALL public methods and properties from Image, even when they are derived from another class (MarshallByRefObject or Object)?