将文件上传到网络共享服务器的方法

1，在文件服务器上，创建一个本地帐户，比如登录名：upload，密码：upload，注意在创建的时候选择“密码永不过期”，去掉勾选“用户下次登录时须更改密码”的选项；
2，在要共享的文件夹上点右键，选择“属性”-“安全”，增加upload帐户可以写入的权限；
3，在要共享的文件夹上点右键，选择“共享”，共享此文件夹，并在“权限”按钮点击后添加帐户upload可修改；
4，在另外一台 Web 服务器上，创建登录名和密码与上面完全相同的本地帐户。
5，在web.config里，启用模拟：      

web.config里添加的代码

< identity impersonate ="true" userName ="upload" password ="upload" />

6，在网站文件夹和Temporary ASP.NET Files文件夹上设置帐户upload读写权限
7，在ASP.NET的上传文件里写：

C# 代码

protected void Button1_Click( object sender, EventArgs e)
{
   string fileName = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
  FileUpload1.SaveAs( @" //192.168.3.1/free/ " + fileName);
}

8，显示上传的文件：
在IIS里创建虚拟目录，指向“另一台计算机上的共享”，“连接为”输入上面创建的帐户名和密码。即可以http://www.mengxianhui.com/upload/hello.jpg进行访问。

注意： 在VS里面直接运行可能会报告
Could not load file or assembly 'WebApplication1' or one of its dependencies. 拒绝访问。
这是因为你模拟的帐户没有权限导致的，你可以发布到IIS看效果。

 下面是一段使用程序进行模拟的方法，出自 http://2leggedspider.wordpress.com/2007/05/28/upload-files-to-unc-share-using-asp-net/ ：

C# 代码

using System.Security.Principal;
using System.Runtime.InteropServices;

namespace FileUploadUNCShare
{
     public partial class _Default : System.Web.UI.Page
    {

         public const int LOGON32_LOGON_INTERACTIVE = 2 ;
         public const int LOGON32_PROVIDER_DEFAULT = 0 ;

        WindowsImpersonationContext impersonationContext;

        [DllImport( " advapi32.dll " )]
         public static extern int LogonUserA(String lpszUserName,
            String lpszDomain,
            String lpszPassword,
             int dwLogonType,
             int dwLogonProvider,
             ref IntPtr phToken);
        [DllImport( " advapi32.dll " , CharSet = CharSet.Auto, SetLastError = true )]
         public static extern int DuplicateToken(IntPtr hToken,
             int impersonationLevel,
             ref IntPtr hNewToken);

        [DllImport( " advapi32.dll " , CharSet = CharSet.Auto, SetLastError = true )]
         public static extern bool RevertToSelf();

        [DllImport( " kernel32.dll " , CharSet = CharSet.Auto)]
         public static extern bool CloseHandle(IntPtr handle);

         private bool ImpersonateUser(String userName, String domain, String password)
        {
            WindowsIdentity tempWindowsIdentity;
            IntPtr token = IntPtr.Zero;
            IntPtr tokenDuplicate = IntPtr.Zero;

             if (RevertToSelf())
            {
                 if (LogonUserA(userName, domain, password, LOGON32_LOGON_INTERACTIVE,
                    LOGON32_PROVIDER_DEFAULT, ref token) != 0 )
                {
                     if (DuplicateToken(token, 2 , ref tokenDuplicate) != 0 )
                    {
                        tempWindowsIdentity = new WindowsIdentity(tokenDuplicate);
                        impersonationContext = tempWindowsIdentity.Impersonate();
                         if (impersonationContext != null )
                        {
                            CloseHandle(token);
                            CloseHandle(tokenDuplicate);
                             return true ;
                        }
                    }
                }
            }
             if (token != IntPtr.Zero)
                CloseHandle(token);
             if (tokenDuplicate != IntPtr.Zero)
                CloseHandle(tokenDuplicate);
             return false ;
        }

         private void UndoImpersonation()
        {
            impersonationContext.Undo();
        }

         protected void Page_Load( object sender, EventArgs e)
        {

        }

         protected void Button1_Click( object sender, EventArgs e)
        {
             if (ImpersonateUser( " upload " , "" , " upload " ))
            {

                 if ((FileUpload1.PostedFile != null ) && (FileUpload1.PostedFile.ContentLength & gt; 0 ))
                {
                     string fileName = System.IO.Path.GetFileName(FileUpload1.PostedFile.FileName);
                     string folderPath = @" //MyUNCShare/MyFolder/ " ;

                     string locationToSave = folderPath + " // " + fileName;
                     try
                    {
                        FileUpload1.PostedFile.SaveAs(locationToSave);
                        Response.Write( " The file has been uploaded. " );
                    }
                     catch (Exception ex)
                    {
                        Response.Write( " Error: " + ex.Message);
                    }
                }
                 else
                {
                    Response.Write( " Please select a file to upload. " );
                }

                UndoImpersonation();
            }
             else
            {
                Response.Write( " Failed " );
            }

        }
    }
}