无边框窗体Winform四周阴影效果 C#完美实现

实现Winform窗体四边阴影效果，在非Win7系统依然可以有阴影效果，附带源码，这是个多窗口组合的效果。

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 CCWin;

namespace Irregular
{
    public partial class FrmMain : SkinMain
    {
        public FrmMain（）
        {
            InitializeComponent（）;
        }
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2013-04-30 00:11  窗体四边阴影\
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\
     文件        1501  2013-04-30 00:04  窗体四边阴影\Irregular\FrmMain.Designer.cs
     文件         381  2013-04-30 00:04  窗体四边阴影\Irregular\FrmMain.cs
     文件        5817  2013-04-30 00:04  窗体四边阴影\Irregular\FrmMain.resx
     文件        4318  2013-04-30 00:04  窗体四边阴影\Irregular\Irregular.csproj
     文件         492  2013-01-31 18:19  窗体四边阴影\Irregular\Program.cs
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\Properties\
     文件        1360  2012-12-24 00:08  窗体四边阴影\Irregular\Properties\AssemblyInfo.cs
     文件        4115  2012-12-26 00:27  窗体四边阴影\Irregular\Properties\Resources.Designer.cs
     文件        7171  2012-12-26 00:27  窗体四边阴影\Irregular\Properties\Resources.resx
     文件        1094  2012-12-24 00:08  窗体四边阴影\Irregular\Properties\Settings.Designer.cs
     文件         249  2012-12-24 00:08  窗体四边阴影\Irregular\Properties\Settings.settings
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\Resources\
     文件      788429  2012-12-24 00:14  窗体四边阴影\Irregular\Resources\DL.png
     文件      141440  2012-12-26 00:27  窗体四边阴影\Irregular\Resources\DemoDlgBg2.png
     文件        5681  2012-12-25 13:47  窗体四边阴影\Irregular\Resources\Vista Aero.png
     文件      283984  2012-12-24 00:14  窗体四边阴影\Irregular\Resources\bj.png
     文件       43675  2012-12-24 00:14  窗体四边阴影\Irregular\Resources\iphoe122.png
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\bin\
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\bin\Debug\
     文件     1561088  2013-04-30 00:04  窗体四边阴影\Irregular\bin\Debug\Irregular.exe
     文件       24064  2013-04-30 00:04  窗体四边阴影\Irregular\bin\Debug\Irregular.pdb
     文件       11600  2013-04-30 00:04  窗体四边阴影\Irregular\bin\Debug\Irregular.vshost.exe
     文件       22528  2013-04-30 00:03  窗体四边阴影\Irregular\bin\Debug\SkinForm.dll
     文件       40448  2013-04-30 00:03  窗体四边阴影\Irregular\bin\Debug\SkinForm.pdb
     目录           0  2018-02-02 17:38  窗体四边阴影\Irregular\bin\Release\
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\obj\
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\obj\x86\
     目录           0  2013-04-30 00:11  窗体四边阴影\Irregular\obj\x86\Debug\
     文件       17315  2013-04-29 23:05  窗体四边阴影\Irregular\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
............此处省略75个文件信息