Bitmap.LockBits Does Not Behave as Expected

Question

I am using  Compact Framework 2.0 / Windows Mobile 5.0 Emulator

When I try to use Lockbits with a Rectangle smaller than the full size of the Bitmap

Lockbits thows a System.ArgumentException "Value does not fall within the expected range."

Lockbits does not do this in a windows desktop application

//This Works

Bitmap bmp = new Bitmap(128,128, PixelFormat.Format24bppRgb);

Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);

PixelFormat pf = PixelFormat.Format24bppRgb;

BitmapData bmpData = bmp.LockBits(rect, ImageLockMode.ReadWrite,pf);

//If I Try to use a Rectangle not the Full Size of the Bitmap

//I Get a System.ArgumentException "Value does not fall within the expected range."

Bitmap bmp = new Bitmap(128,128, PixelFormat.Format24bppRgb);

Rectangle rect = new Rectangle(0, 0, bmp.Width/2, bmp.Height/2);

PixelFormat pf = PixelFormat.Format24bppRgb;

BitmapData bmpData = bmp.LockBits(rect, ImageLockMode.ReadWrite,pf);

 

Answer 1

That is by design limitation on devices.

Answer 2

Thanks  Ilya

I will find another way

It does not indicate that in the reference