winform 文件上传（将本地文件上传到指定的服务器（HttpWebRequest方法））

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace UploadFiles
{
    [ComImport GuidAttribute（“CB5BDC81-93C1-11CF-8F20-00805F2CD064“）]
    [InterfaceTypeAttribute（ComInterfaceType.InterfaceIsIUnknown）]
    interface IobjectSafety
    {
        [PreserveSig]
        int GetInterfaceSafetyOptions（
            ref Guid riid
            [MarshalAs（UnmanagedType.U4）] ref int pdwSupportedOptions
            [MarshalAs（UnmanagedType.U4）] ref int pdwEnabledOptions
            ）;

        [PreserveSig（）]
        int SetInterfaceSafetyOptions（
            ref Guid riid
            [MarshalAs（UnmanagedType.U4）] int dwOptionSetMask
            [MarshalAs（UnmanagedType.U4）] int dwEnabledOptions
            ）;

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2016-06-26 10:47  UploadFiles\
     文件        1967  2016-06-26 10:43  UploadFiles.sln
     目录           0  2016-05-10 17:04  UploadFiles\bin\
     目录           0  2016-05-10 17:03  UploadFiles\bin\Debug\
     目录           0  2016-05-10 17:26  UploadFiles\bin\Release\
     文件       11776  2016-06-26 10:47  UploadFiles\bin\Release\UploadFiles.dll
     文件       22016  2016-06-26 10:47  UploadFiles\bin\Release\UploadFiles.pdb
     文件        1980  2016-06-26 10:47  UploadFiles\bin\Release\UploadFiles.tlb
     文件         813  2016-05-10 17:06  UploadFiles\IobjectSafety.cs
     目录           0  2016-06-26 10:47  UploadFiles\obj\
     目录           0  2016-05-10 17:05  UploadFiles\obj\Debug\
     文件         789  2016-05-10 17:05  UploadFiles\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        5225  2016-05-10 17:06  UploadFiles\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     目录           0  2016-05-10 17:03  UploadFiles\obj\Debug\TempPE\
     目录           0  2016-06-26 10:47  UploadFiles\obj\Release\
     文件         791  2016-06-26 10:34  UploadFiles\obj\Release\DesignTimeResolveAssemblyReferences.cache
     文件        5984  2016-06-26 10:34  UploadFiles\obj\Release\DesignTimeResolveAssemblyReferencesInput.cache
     目录           0  2016-05-10 17:07  UploadFiles\obj\Release\TempPE\
     文件        1572  2016-06-26 10:43  UploadFiles\obj\Release\UploadFiles.csproj.FileListAbsolute.txt
     文件         780  2016-06-26 10:47  UploadFiles\obj\Release\UploadFiles.csproj.GenerateResource.Cache
     文件       11776  2016-06-26 10:47  UploadFiles\obj\Release\UploadFiles.dll
     文件       22016  2016-06-26 10:47  UploadFiles\obj\Release\UploadFiles.pdb
     文件         180  2016-06-26 10:47  UploadFiles\obj\Release\UploadFiles.UploadFiles.resources
     文件         633  2016-06-26 10:47  UploadFiles\obj\UploadFiles.csproj.UnmanagedRegistration.cache
     目录           0  2016-05-10 17:03  UploadFiles\Properties\
     文件        1435  2016-05-10 17:17  UploadFiles\Properties\AssemblyInfo.cs
     文件        9348  2016-06-26 10:47  UploadFiles\UploadFiles.cs
     文件        2649  2016-05-10 17:17  UploadFiles\UploadFiles.csproj
     文件        4288  2016-06-26 10:47  UploadFiles\UploadFiles.Designer.cs
     文件        5817  2016-06-26 10:47  UploadFiles\UploadFiles.resx
     目录           0  2016-06-26 10:47  UploadTool\
............此处省略69个文件信息