C# ASP.NET MVC4中的Active Directory字段-未处理的异常

我需要实现一个从AD中检索某些字段的类。我遵循了以下说明：。但我从第行收到一个未处理的异常：

return (UserPrincipalExtended)FindByIdentityWithType(context, typeof(UserPrincipalExtended), identityValue)

我的控制器代码如下所示：

using System.Threading.Tasks;
using System.Net;
using System.Data.Entity;
using System.DirectoryServices.AccountManagement;
(...)

public class HomeController : Controller
{
   private FormsEntities db = new FormsEntities();

   public async Task<ActionResult> Index()
   {          
        UserPrincipalExtended user = UserPrincipalExtended.FindByIdentity(
        new PrincipalContext(ContextType.Domain), User.Identity.Name);          

        var title = user.Title;        
        ViewBag.Message = title;

        return View();
   }

---

显示正确的用户。此外，我还尝试操作对象类型[DirectoryObjectClassuser]，但没有任何结果。

首先，我建议将PrincipalContext放入一个using{…}中？堵塞以确保正确处理

另外：无论何时调用进入Active Directory或数据库的方法，或调用web服务，您都需要确保实际返回的内容是有效的！不要盲目地认为电话成功了——也许它成功了——也许它没有成功——检查是否成功

所以我会这样写这个索引方法：

public async Task<ActionResult> Index()
{          
    using (PrincipalContext ctx = new PrincipalContext(ContextType.Domain))
    {
        UserPrincipalExtended user = UserPrincipalExtended.FindByIdentity(ctx, User.Identity.Name);          

        // check FOR NULL ! 
        // Defensive programming 101 - ALWAYS check, NEVER just assume!
        if (user != null) 
        {
            var title = user.Title;        
            ViewBag.Message = title;
        }
        else 
        {
            // handle the case that NO user was found !
            ViewBag.Message = "(no user found)";
        }
    }

    return View();
}

---

我已经检查过null==UserPrincipalExtend.FindByIdentity new PrincipalContextContextType.Domain，User.Identity.Name{抛出新的异常some exception；}但异常仍然发生谢谢，但没有结果。我明白了！对于那些有类似问题的用户，您需要像这样放置用户对象：使用HostingEnvironment.Impersonate{UserPrincipal user=UserPrincipal.FindByIdentitynew PrincipalContextContextType.Domain，user.Identity.Name；

public async Task<ActionResult> Index()
{          
    using (PrincipalContext ctx = new PrincipalContext(ContextType.Domain))
    {
        UserPrincipalExtended user = UserPrincipalExtended.FindByIdentity(ctx, User.Identity.Name);          

        // check FOR NULL ! 
        // Defensive programming 101 - ALWAYS check, NEVER just assume!
        if (user != null) 
        {
            var title = user.Title;        
            ViewBag.Message = title;
        }
        else 
        {
            // handle the case that NO user was found !
            ViewBag.Message = "(no user found)";
        }
    }

    return View();
}