c# save System.Drawing.Graphics to file

问题

I have a System.Drawing.Graphics took from a picturebox.

basically I draw some lines over a background image stored into the picturebox now I wish save a png that contains the background image and everything is drawn over there...

is there a way to do this? thanks in advance

回答1:

If you are drawing these lines on the Paint event then you need to create a BitMap with the BackgroundImage and call your paint function with the Bitmap's Graphics, and then call Bitmap.Save().

        Bitmap bmp = new Bitmap(MyPictureBox.BackgroundImage);
        var g = Graphics.FromImage(bmp);
        MyPictureBox.OnPaint(new System.Windows.Forms.PaintEventArgs(g, bmp.GetBounds());

回答2:

Yep, use the Image.Save method on your PictureBox's Image:

pictureBox.Image.Save(fullnameOfYourImage, System.Drawing.Imaging.ImageFormat.Png);

回答3:

Pretty sure you can convert to a Bitmap and save it?

See this article:

Saving System.Drawing.Graphics to a png or bmp

来源：https://stackoverflow.com/questions/11621726/c-sharp-save-system-drawing-graphics-to-file