C# 截取屏幕

/// <summary>
/// 截取屏幕
/// </summary>
/// <param name="x">起点x坐标</param>
/// <param name="y">起点y坐标</param>
/// <param name="width">截取宽度</param>
/// <param name="height">截取高度</param>
/// <returns></returns>
private void capturescreen(double x, double y, double width, double height)
{
    int ix = convert.toint32(x);
    int iy = convert.toint32(y);
    int iw = convert.toint32(width);
    int ih = convert.toint32(height);

    system.drawing.bitmap bitmap = new system.drawing.bitmap(iw, ih);
    system.drawing.graphics graphics = system.drawing.graphics.fromimage(bitmap);
    graphics.copyfromscreen(ix, iy, 0, 0, new system.drawing.size(iw, ih));
    graphics.dispose();
}