asp.net实现访问局域网共享目录下文件的解决方法


            本文以实例讲述了asp.net实现访问局域网共享目录下文件的解决方法，完整代码如下所示：





using System; 

using System.Collections; 

using System.Configuration; 

using System.Data; 

using System.Linq; 

using System.Web; 

using System.Web.Security; 

using System.Web.UI; 

using System.Web.UI.HtmlControls; 

using System.Web.UI.WebControls; 

using System.Web.UI.WebControls.WebParts; 

using System.Xml.Linq; 

using System.IO; 

using System.Security.Principal; 

using System.Runtime.InteropServices; 

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); 

  public void Page_Load(Object s, EventArgs e) 

  { 

    if (impersonateValidUser("lucas", "Workgroup", "lcas")) 

    { 

      string path = @"//zhehui001/lu"; 

      foreach (string f in Directory.GetFiles(path)) 

      { 

        Response.Write(f); 

      } 

      undoImpersonation(); 

    } 

    else 

    { 

      //Your impersonation failed. Therefore, include a fail-safe mechanism here. 

    } 

  } 

  private bool impersonateValidUser(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(); 

  } 

}