如何在c#中模拟鼠标/按钮单击

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

    [StructLayout(LayoutKind.Sequential)]
    struct INPUT
    {
        public int type;
        public MOUSEINPUT mi;
    }

    [StructLayout(LayoutKind.Sequential)]
    struct MOUSEINPUT
    {
        public int dx;
        public int dy;
        public uint mouseData;
        public uint dwFlags;
        public uint time;
        public IntPtr dwExtraInfo;
    }

    const int INPUT_MOUSE = 0;
    const int MOUSEEVENTF_LEFTDOWN = 0x0002;
    const int MOUSEEVENTF_LEFTUP = 0x0004;

    static void Main()
    {
        // 模拟鼠标左键按下
        INPUT[] input = new INPUT[1];
        input[0].type = INPUT_MOUSE;
        input[0].mi.dx = 0;
        input[0].mi.dy = 0;
        input[0].mi.mouseData = 0;
        input[0].mi.dwFlags = MOUSEEVENTF_LEFTDOWN;
        input[0].mi.time = 0;
        input[0].mi.dwExtraInfo = IntPtr.Zero;
        SendInput(1, input, Marshal.SizeOf(typeof(INPUT)));

        // 模拟鼠标左键释放
        input[0].mi.dwFlags = MOUSEEVENTF_LEFTUP;
        SendInput(1, input, Marshal.SizeOf(typeof(INPUT)));
    }
}