C#双击文件只让同一个程序打开文件

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Form1.cs代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
using System.Runtime.InteropServices;
namespace Mydoc
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static void SaveReg(string p_Filename, string p_FileTypeName)
        {
            RegistryKey _RegKey = Registry.ClassesRoot.OpenSubKey("", true);              //打开注册表

            RegistryKey _VRPkey = _RegKey.OpenSubKey(p_FileTypeName);
            if (_VRPkey != null) _RegKey.DeleteSubKey(p_FileTypeName, true);
            _RegKey.CreateSubKey(p_FileTypeName);
            _VRPkey = _RegKey.OpenSubKey(p_FileTypeName, true);
            _VRPkey.SetValue("", "Exec");

_VRPkey = _RegKey.OpenSubKey("Exec", true);
if (_VRPkey != null) _RegKey.DeleteSubKeyTree("Exec"); //如果等于空就删除注册表DSKJIVR

            _RegKey.CreateSubKey("Exec");
            _VRPkey = _RegKey.OpenSubKey("Exec", true);
            _VRPkey.CreateSubKey("shell");
            _VRPkey = _VRPkey.OpenSubKey("shell", true);                      //写入必须路径
            _VRPkey.CreateSubKey("open");
            _VRPkey = _VRPkey.OpenSubKey("open", true);
            _VRPkey.CreateSubKey("command");
            _VRPkey = _VRPkey.OpenSubKey("command", true);
            string _PathString = "/"" + p_Filename + "/" /"%1/"";
            _VRPkey.SetValue("", _PathString);                                    //写入数据

        }
        public static void DelReg(string p_FileTypeName)
        {
            RegistryKey _Regkey = Registry.ClassesRoot.OpenSubKey("", true);

            RegistryKey _VRPkey = _Regkey.OpenSubKey(p_FileTypeName);
            if (_VRPkey != null) _Regkey.DeleteSubKey(p_FileTypeName, true);
            if (_VRPkey != null) _Regkey.DeleteSubKeyTree("Exec");

}

private void Form1_Load(object sender, EventArgs e)
{

            SaveReg(Application.ExecutablePath,".task");
            string[] argv=Environment.GetCommandLineArgs();
            if (argv.GetLength(0) == 2)
            {
                MessageBox.Show(argv[1]);
            }
        }
        protected override void DefWndProc(ref System.Windows.Forms.Message m)
        {
            switch (m.Msg)
            {
                case 0x004A:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();
                    mystr = (COPYDATASTRUCT)m.GetLParam(mytype);
                    MessageBox.Show(mystr.lpData);
                    break;
                default:
                    base.DefWndProc(ref m);
                    break;
            }
        }
    }
    public struct COPYDATASTRUCT
    {
        public IntPtr dwData;
        public int cbData;
        [MarshalAs(UnmanagedType.LPStr)]
        public string lpData;

}
}

Programe.cs代码：

using System.Collections.Generic;
using System.Linq;
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
using System.Threading;
namespace Mydoc
{
    static class Program
    {
        public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;
        }

        [DllImport("User32.dll",EntryPoint="SendMessage")]
                private static extern int SendMessage(
                int hWnd, // handle to destination window
                int Msg, // message
                int wParam, // first message parameter
                ref COPYDATASTRUCT lParam // second message parameter
                );

        [DllImport("User32.dll",EntryPoint="FindWindow")]
                private static extern int FindWindow(string lpClassName,string
                lpWindowName);

        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            bool bExist=true;

            Mutex MyMutex = new Mutex(true, "ONLYONETASK", out bExist);
            if (!bExist)
            {
                string[] cmds=Environment.GetCommandLineArgs();
                if (cmds.Length == 2)
                {
                    int WINDOW_HANDLER = FindWindow(null, @"Form1");
                    if (WINDOW_HANDLER != 0)
                    {
                        COPYDATASTRUCT cds;
                        cds.dwData = (IntPtr)100;
                        cds.lpData = cmds[1];
                        cds.cbData = cmds[1].Length*2;
                        SendMessage(WINDOW_HANDLER, 0x004A, 0, ref cds);

                    }
                }
            }
            else
            {

                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Form1());
            }
        }
    }
}

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