1、添加命名空间

using System.Runtime.InteropServices;

2、添加DLL引用

/// <summary>
/// 控制鼠标指针显示和隐藏
/// </summary>
public class MousePointer
{
    /// <summary>
    /// 调用系统API函数操作鼠标指针
    /// </summary>
    /// <param name="status">0表示隐藏鼠标指针,1表示显示鼠标指针</param>
    [DllImport("user32.dll", EntryPoint = "ShowCursor", CharSet = CharSet.Auto)]
    public static extern void ShowCursor(int status);
}``