C# 屏蔽ALT+F4组合键关闭窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace CancelAltAndF4
{
    public partial class Frm_Main : Form
    {
        public Frm_Main（）
        {
            InitializeComponent（）;
        }

        private void Form1_KeyDown（object sender KeyEventArgs e）
        {
            if （e.Alt && e.KeyValue == 115）//如果按下的Alt和F4
                e.Handled = true;//不执行操作
        }
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件     256000  2016-12-22 03:30  CancelAltAndF4\CancelAltAndF4\bin\Debug\CancelAltAndF4.exe

     文件      34304  2016-12-22 03:30  CancelAltAndF4\CancelAltAndF4\bin\Debug\CancelAltAndF4.pdb

     文件      14328  2016-12-22 03:30  CancelAltAndF4\CancelAltAndF4\bin\Debug\CancelAltAndF4.vshost.exe

     文件        490  2016-12-22 03:29  CancelAltAndF4\CancelAltAndF4\bin\Debug\CancelAltAndF4.vshost.exe.manifest

     文件       3997  2016-12-21 17:48  CancelAltAndF4\CancelAltAndF4\CancelAltAndF4.csproj

     文件        561  2016-12-21 17:48  CancelAltAndF4\CancelAltAndF4\Frm_Main.cs

     文件       1944  2016-12-21 17:48  CancelAltAndF4\CancelAltAndF4\Frm_Main.designer.cs

     文件     377027  2016-12-21 17:49  CancelAltAndF4\CancelAltAndF4\Frm_Main.resx

     文件       3029  2016-12-22 03:29  CancelAltAndF4\CancelAltAndF4\obj\Debug\CancelAltAndF4.csproj.FileListAbsolute.txt

     文件        850  2016-12-22 03:28  CancelAltAndF4\CancelAltAndF4\obj\Debug\CancelAltAndF4.csproj.GenerateResource.Cache

     文件     256000  2016-12-22 03:28  CancelAltAndF4\CancelAltAndF4\obj\Debug\CancelAltAndF4.exe

     文件     247765  2016-12-22 03:30  CancelAltAndF4\CancelAltAndF4\obj\Debug\CancelAltAndF4.Frm_Main.resources

     文件      34304  2016-12-22 03:28  CancelAltAndF4\CancelAltAndF4\obj\Debug\CancelAltAndF4.pdb

     文件        180  2016-12-22 03:28  CancelAltAndF4\CancelAltAndF4\obj\Debug\CancelAltAndF4.Properties.Resources.resources

     文件       7038  2016-12-22 03:28  CancelAltAndF4\CancelAltAndF4\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件       4608  2016-12-22 04:17  CancelAltAndF4\CancelAltAndF4\obj\Debug\TempPE\Properties.Resources.Designer.cs.dll

     文件        498  2016-12-21 17:47  CancelAltAndF4\CancelAltAndF4\Program.cs

     文件       1360  2016-12-21 21:16  CancelAltAndF4\CancelAltAndF4\Properties\AssemblyInfo.cs

     文件       2868  2016-12-21 21:16  CancelAltAndF4\CancelAltAndF4\Properties\Resources.Designer.cs

     文件       5612  2016-12-21 21:16  CancelAltAndF4\CancelAltAndF4\Properties\Resources.resx

     文件       1114  2016-12-21 21:16  CancelAltAndF4\CancelAltAndF4\Properties\Settings.Designer.cs

     文件        249  2016-12-21 21:15  CancelAltAndF4\CancelAltAndF4\Properties\Settings.settings

     文件        932  2016-12-21 16:09  CancelAltAndF4\CancelAltAndF4.sln

     目录          0  2016-12-22 04:17  CancelAltAndF4\CancelAltAndF4\obj\Debug\Refactor

     目录          0  2016-12-22 04:17  CancelAltAndF4\CancelAltAndF4\obj\Debug\TempPE

     目录          0  2016-12-22 03:30  CancelAltAndF4\CancelAltAndF4\bin\Debug

     目录          0  2016-12-22 03:29  CancelAltAndF4\CancelAltAndF4\bin\Release

     目录          0  2016-12-22 04:17  CancelAltAndF4\CancelAltAndF4\obj\Debug

     目录          0  2016-12-22 03:29  CancelAltAndF4\CancelAltAndF4\bin

     目录          0  2016-12-22 03:27  CancelAltAndF4\CancelAltAndF4\obj

............此处省略6个文件信息