托管environment.impersonate无法与服务器上的System.DirectoryServices.AccountManagement一起使用

Question

您好，我想检索属于登录用户的组，我尝试了以下代码，但它在服务器上不起作用。

   using (System.Web.Hosting.HostingEnvironment.Impersonate())
   {  
    string userName = HttpContext.Current.User.Identity.Name;
           PrincipalContext domain = new PrincipalContext(ContextType.Domain);
    UserPrincipal User = new UserPrincipal(domain);
    User = UserPrincipal.FindByIdentity(domain, userName);
    var strUnAuthorised = "";
    if (User != null)
    {
        PrincipalSearchResult<Principal> gp = User.GetGroups();
        foreach (Principal p in gp)
        {
            if (p.DisplayName == "xyz")
            {
                IsInGroup = true;
                break;
            }
        }
    }
}

此后，当我尝试从服务器读取一个 xml 文件时，我收到未经授权的错误。请帮助我，我很挣扎