C#如何在窗口2关闭已经隐藏的窗口1？

/*-->思路（仅供参考）：先找到窗体的句柄（存放到mainHandle）-->再用SendMessage(mainHandle, 0x10, 0, 0);关闭窗体*/
using BCZG_WinFrom;
using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BCZG_WinFrom
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 获取窗体的句柄函数
        /// </summary>
        /// <param name="lpClassName">窗口类名</param>
        /// <param name="lpWindowName">窗口标题名</param>
        /// <returns>返回句柄</returns>
        [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
        /// <summary>
        /// 设置窗体状态（0：隐藏窗体，1：默认窗体，2：最小化窗体，3：最大化窗体，....）
        /// </summary>
        /// <param name="hwnd">窗体句柄</param>
        /// <param name="nCmdShow">状态</param>
        /// <returns></returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);
        /// <summary>
        ///
        /// </summary>
        /// <param name="hwnd">窗体句柄</param>
        /// <param name="wMsg">16进制0x10为关闭窗体</param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        [DllImport("user32.dll", EntryPoint = "SendMessageA")]
        public static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        IntPtr mainHandle = IntPtr.Zero;
        private void button1_Click(object sender, EventArgs e)
        {
            FormEg EgFrm1 = new FormEg();
            EgFrm1.Text = "测试窗体";
            EgFrm1.Show();
        }
        /// <summary>
        /// 隐藏窗体
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {
            // 获取查找窗体句柄(通过窗体标题名)
            mainHandle = FindWindow(null, "测试窗体");
            if (mainHandle != IntPtr.Zero)
            {
                Console.WriteLine("找到窗体");
                //通过句柄设置当前窗体状态（0：隐藏窗体，1：默认窗体，2：最小化窗体，3：最大化窗体，....）
                ShowWindow(mainHandle, 0);
            }else
            {
                MessageBox.Show("没有找到！");
            }

        }
        /// <summary>
        /// 关闭窗体
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            if(mainHandle!=IntPtr.Zero)
                SendMessage(mainHandle, 0x10, 0, 0);
            else
            {
                MessageBox.Show("没有可关闭的窗体！");
            }
        }
    }
}

[此贴子已经被作者于2019-1-6 21:30编辑过]