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(); 
  } 
}