c#指定区域屏幕截屏功能实现代码

//截取全屏图象
private void btnFullScreen_Click(object sender, EventArgs e)
{
    //创建图象，保存将来截取的图象
    Bitmap image = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
    Graphics imgGraphics = Graphics.FromImage(image);
    //设置截屏区域
    imgGraphics.CopyFromScreen(0, 0, 0, 0, new Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height));
    //保存
    SaveImage(image);
}
//保存图象文件
private void SaveImage(Image image)
{
    if (saveFileDialog.ShowDialog(this) == DialogResult.OK)
    {
string fileName = saveFileDialog.FileName;
string extension = Path.GetExtension(fileName);
if (extension == ".jpg")
{
    image.Save(fileName, ImageFormat.Jpeg);
}
else
{
    image.Save(fileName, ImageFormat.Bmp);
}
    }
}