将窗体捕获到图像中

Question

I know this question has been answered before. But none of the answers are correct. How can I capture the image of a windows form and save it. I use this:

Bitmap bmp = new Bitmap(this.Width, this.Height);
this.DrawToBitmap(bmp, new Rectangle(Point.Empty, bmp.Size));
bmp.Save(@"C://Desktop//sample.png",ImageFormat.Png);

but get the error:

A generic error occurred in GDI+

I have also read about this error but none of the suggestions work for me! Please help

Answer 1

The problem is in bmp.Save(@"C://Desktop//sample.png",ImageFormat.Png); .

First it must be @"C:\\Desktop\\sample.png", you don't need to escape anything with verbatim string .

Second make sure the path is correct and you have permission to write to.

Third as Sayse point out dispose the bitmap.

using(Bitmap bmp = new Bitmap(this.Width, this.Height))
{
    this.DrawToBitmap(bmp, new Rectangle(Point.Empty, bmp.Size));
    bmp.Save(@"C:\Desktop\sample.png",ImageFormat.Png); // make sure path exists!
}

Answer 2

Your path is in wrong format. Should be:

bmp.Save("C:\\Desktop\\sample.png",ImageFormat.Png);

What is more - check if the folder exists