Winform应用程序如何使用自定义的鼠标图片

class MouseStyle
{
  [DllImport("user32.dll")]
  public static extern IntPtr SetCursor(IntPtr cursorHandle);


  static MouseStyle()
  {
    InitMouseStyle();
  }

  private static void InitMouseStyle()
  {
    if (Hand == null)
    {
      Hand = SetCursor("Image//Hand.png");
    }
    if (Arrow == null)
    {
      Arrow = SetCursor("Image//Arrow.png");
    }
  }
  /// <summary>
  /// 鼠标手型样式
  /// </summary>
  public static Cursor Hand = null;

  /// <summary>
  /// 鼠标指针样式
  /// </summary>
  public static Cursor Arrow = null;

  /// <summary>
  /// 设置鼠标样式
  /// </summary>
  /// <param name="fileName">自定义的鼠标样式文件</param>
  /// <returns>鼠标样式</returns>
  private static Cursor SetCursor(string fileName)
  {
    //文件的绝对路径，在debug下
    var path = System.IO.Path.GetFullPath(fileName) ;

    //画图
    Bitmap bit = (Bitmap)Bitmap.FromFile(path, true);
    Bitmap myNewCursor = new Bitmap(bit.Width, bit.Height);
    Graphics g = Graphics.FromImage(myNewCursor);
    g.Clear(Color.FromArgb(0, 0, 0, 0));

    //箭头和手型有点不一样
    if (System.IO.Path.GetFileName(fileName).Equals("Hand.png"))
    {
      g.DrawImage(bit, bit.Width / 2 - 15, bit.Height / 2, bit.Width / 2, bit.Height / 2);
    }
    else
    {
      g.DrawImage(bit, bit.Width / 2 - 15, bit.Height / 2, bit.Width / 2, bit.Height / 2);
    }

    Cursor cursor;
    //获取图片的句柄
    try
    {
      cursor = new Cursor(myNewCursor.GetHicon());
    }
    catch
    {
      cursor = new Cursor(Icon.FromHandle(myNewCursor.GetHicon()).Handle);
    }

    //释放资源
    g.Dispose();

    return cursor;
  }
}

/// <summary>
/// 设置鼠标样式
/// </summary>
/// <param name="col">控件</param>
public static void SetMouseStyle(Control col)
{
  InitMouseStyle();

  //设置窗体鼠标为箭头
  if (col is Form)
  {
    ((Form)col).Cursor = Arrow;
  }

  //遍历控件，如果控件是箭头或默认，就改为自定义的箭头
  //如果是手型就改为自定义的手型
  foreach (Control con in col.Controls)
  {
    if (con.Cursor == Cursors.Hand)
    {
      con.Cursor = Hand;
    }
    if (con.Cursor == Cursors.Arrow || con.Cursor == Cursors.Default)
    {
      con.Cursor = Arrow;
    }

    //递归遍历
    SetMouseStyle((Control)con);
  }
}

[DllImport("User32.DLL")]
public static extern bool SetSystemCursor(IntPtr hcur, uint id);
public const uint OCR_NORMAL = 32512;
public const uint OCR_HAND = 32649;
public const uint OCR_IBEAM = 32513;
//速查 https://docs.microsoft.com/zh-cn/windows/win32/api/winuser/nf-winuser-setsystemcursor?redirectedfrom=MSDN
//OCR_APPSTARTING：标准箭头和小的沙漏；32650
//OCR_NORMAL：标准箭头 32512
//OCR_CROSS：交叉十字线光标： 32515
//OCR_HAND：手的形状（WindowsNT5.0和以后版本） 32649
//OCR_HELP：箭头和向东标记； 32651
//OCR_IBEAM：I形梁； 32513
//OCR_NO：斜的圆 32648
//OCR_SIZEALL：四个方位的箭头分别指向北、南、东、西 32646
//OCR_SIZENESEW：双箭头分别指向东北和西南； 32643
//OCR_SIZENS：双箭头，分别指向北和南 32645
//OCR_SIZENWSE：双箭头分别指向西北和东南； 32642
//OCR_SIZEWE：双箭头分别指向西和东 32644
//OCR_UP：垂直箭头： 32516
//OCR_WAIT：32514 沙漏返回值：如果成功，返回非零值；如果失败，返回值为零。

[DllImport("User32.DLL")]
public static extern bool SystemParametersInfo(uint uiAction, uint uiParam,
 IntPtr pvParam, uint fWinIni);
public const uint SPI_SETCURSORS = 87;
public const uint SPIF_SENDWININICHANGE = 2;

private void button1_Click(object sender, EventArgs e)
{
  //设置
  SetSystemCursor(Cursors.WaitCursor.CopyHandle(), OCR_NORMAL);
  SetSystemCursor(Cursors.WaitCursor.CopyHandle(), OCR_IBEAM);
  //..可以根据情况加
}

private void button2_Click(object sender, EventArgs e)
{
  //恢复
  SystemParametersInfo(SPI_SETCURSORS, 0, IntPtr.Zero, SPIF_SENDWININICHANGE);
}