c#裁剪图片，根据指定坐标和宽度高度

public Bitmap CropImage(Bitmap source, Rectangle section)
{
    // An empty bitmap which will hold the cropped image
    Bitmap bmp = new Bitmap(section.Width, section.Height);

    Graphics g = Graphics.FromImage(bmp);

    // Draw the given area (section) of the source image
    // at location 0,0 on the empty bitmap (bmp)
    g.DrawImage(source, 0, 0, section, GraphicsUnit.Pixel);

    return bmp;
}

// 使用举例:

Bitmap source = new Bitmap(@"C:\tulips.jpg");
Rectangle section = new Rectangle(new Point(12, 50), new Size(150, 150));

Bitmap CroppedImage = CropImage(source, section);