保持带图标的桌面截图

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.IO;

        private int _X, _Y;
        [StructLayout(LayoutKind.Sequential)]
        private struct ICONINFO
        {
            public bool fIcon;
            public Int32 xHotspot;
            public Int32 yHotspot;
            public IntPtr hbmMask;
            public IntPtr hbmColor;
        }
        [StructLayout(LayoutKind.Sequential)]
        private struct CURSORINFO
        {
            public Int32 cbSize;
            public Int32 flags;
            public IntPtr hCursor;
            public Point ptScreenPos;
        }  

        [DllImport("user32.dll", EntryPoint = "GetSystemMetrics")]
        private static extern int GetSystemMetrics(int mVal);
        [DllImport("user32.dll", EntryPoint = "GetCursorInfo")]
        private static extern bool GetCursorInfo(ref CURSORINFO cInfo);
        [DllImport("user32.dll", EntryPoint = "CopyIcon")]
        private static extern IntPtr CopyIcon(IntPtr hIcon);
        [DllImport("user32.dll", EntryPoint = "GetIconInfo")]
        private static extern bool GetIconInfo(IntPtr hIcon, out ICONINFO iInfo);

  private Bitmap CaptureDesktop()//抓取带鼠标的桌面

        {
            try
            {
                int _CX = 0, _CY = 0;
                Bitmap _Source = new Bitmap(GetSystemMetrics(0), GetSystemMetrics(1));
                using (Graphics g = Graphics.FromImage(_Source))
                {

                    g.CopyFromScreen(0, 0, 0, 0, _Source.Size);
                    g.DrawImage(CaptureCursor(ref _CX, ref _CY), _CX, _CY);
                    g.Dispose();
                }
                _X = (800 - _Source.Width) / 2;
                _Y = (600 - _Source.Height) / 2;
                return _Source;
            }
            catch
            {
                return null;
            }

        }

 private Bitmap CaptureCursor(ref int _CX, ref int _CY)
        {
            IntPtr _Icon;
            CURSORINFO _CursorInfo = new CURSORINFO();
            ICONINFO _IconInfo;
            _CursorInfo.cbSize = Marshal.SizeOf(_CursorInfo);
            if (GetCursorInfo(ref _CursorInfo))
            {
                if (_CursorInfo.flags == 0x00000001)
                {
                    _Icon = CopyIcon(_CursorInfo.hCursor);

                    if (GetIconInfo(_Icon, out _IconInfo))
                    {
                        _CX = _CursorInfo.ptScreenPos.X - _IconInfo.xHotspot;
                        _CY = _CursorInfo.ptScreenPos.Y - _IconInfo.yHotspot;
                        return Icon.FromHandle(_Icon).ToBitmap();
                    }
                }
            }
            return null;
        }