4

所以我刚刚在我的 MVC3 站点上实现了一个基本控制器，以便在加载每个视图之前执行一些操作。特别是我想要一些可以作为一种母版页代码的东西。一旦我滚动它并使我的所有控制器都从我的基本控制器继承，我会收到此错误：

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.



[NullReferenceException: Object reference not set to an instance of an object.]
System.Web.Mvc.Controller.PossiblyLoadTempData() +11
System.Web.Mvc.Controller.ExecuteCore() +38
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +50
System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8970061
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184

我阅读了一些您需要覆盖 CreateTempDataProvider() 并返回某些内容或其他内容的地方，但我不太清楚这样做的代码。我对 .NET 比较陌生，之前还没有覆盖任何东西，所以我不知道该怎么做。如果您以前遇到过这种情况，或者知道该怎么做，请帮助！

这是我的基本控制器以及我迄今为止所做的覆盖尝试无济于事：

 public class BaseController : Controller
{
    protected override void Initialize(System.Web.Routing.RequestContext requestContext)
    {

        string document = Path.Combine(HttpRuntime.AppDomainAppPath, "quote.xml");
        string _quote = "";
        string _author = "";
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(document);

        XmlNode Quote = xmlDoc.SelectSingleNode("quote/text");
        XmlNode Author = xmlDoc.SelectSingleNode("quote/author");

        _quote = Quote.InnerText;
        _author = Author.InnerText;

        ViewData["Quote"] = _quote;
    }

    protected override ITempDataProvider CreateTempDataProvider()
    {
        return base.CreateTempDataProvider();
    }
}

这是我开始调试时尝试运行的控制器（如果需要，不知道）：

public class BlogController : BaseController
{
    private DarkRobotEntities1 db = new DarkRobotEntities1();

    //
    // GET: /Blog/

    public ViewResult Index()
    {
        var posts = db.Posts.Include(p => p.Blog).Include(p => p.Comments);
        return View(posts.ToList());
    }
...
}
4

1 回答 1

12

您需要base.Initialize()在重写方法的顶部调用Initialize()以初始化基Controller类。

否则，PossiblyLoadTempData()将永远不会设置 by 使用的属性。

于 2012-06-11T02:20:54.260 回答