asp.net访问网络路径方法(模拟用户登录)

public class identityscope : idisposable
{
    // obtains user token
    [dllimport("advapi32.dll", setlasterror = true)]
    static extern bool logonuser(string pszusername, string pszdomain, string pszpassword,int dwlogontype, int dwlogonprovider, ref intptr phtoken);
    // closes open handes returned by logonuser
    [dllimport("kernel32.dll", charset = charset.auto)]
    extern static bool closehandle(intptr handle);

    [dllimport("advapi32.dll")]
    static extern bool impersonateloggedonuser(intptr htoken);
    [dllimport("advapi32.dll")]
    static extern bool reverttoself();
    const int logon32_provider_default = 0;
    const int logon32_logon_newcredentials = 9;//域ò控?中d的?需è要a用?:interactive = 2
    private bool disposed;
    /// <summary>
    /// 登?录?
    /// </summary>
    /// <param name="susername">用?户§名?</param>
    /// <param name="sdomain">域ò名?，?如?果?不?在ú域ò中d就í使1用?机ú器÷ip地?址·</param>
    /// <param name="spassword">密ü码?</param>
    public identityscope(string susername, string sdomain, string spassword)
    {
      // initialize tokens
      intptr pexistingtokenhandle = new intptr(0);
      intptr pduplicatetokenhandle = new intptr(0);
      try
      {
        // get handle to token
        bool bimpersonated = logonuser(susername, sdomain, spassword,logon32_logon_newcredentials, logon32_provider_default, ref pexistingtokenhandle);
        if (true == bimpersonated)
        {
          if (!impersonateloggedonuser(pexistingtokenhandle))
          {
            int nerrorcode = marshal.getlastwin32error();
            throw new exception("impersonateloggedonuser error;code=" + nerrorcode);
          }
        }
        else
        {
          int nerrorcode = marshal.getlastwin32error();
          throw new exception("logonuser error;code=" + nerrorcode);
        }
      }
      finally
      {
        // close handle(s)
        if (pexistingtokenhandle != intptr.zero)
          closehandle(pexistingtokenhandle);
        if (pduplicatetokenhandle != intptr.zero)
          closehandle(pduplicatetokenhandle);
      }
    }
    protected virtual void dispose(bool disposing)
    {
      if (!disposed)
      {
        reverttoself();
        disposed = true;
      }
    }
    public void dispose()
    {
      dispose(true);
    }
  }

using (identityscope c = new identityscope("administrator", "192.168.0.1", "11111"))
{
 string[] filelist = system.io.directory.getdirectories(@"\192.168.0.1foldername");
}