asp.net-mvc-4 - DevTrends.MvcDonutCaching.KeyGenerator.GenerateKey 中的 NullReferenceException

Question

我遇到了@Aviv 在这篇文章中描述的问题:
http://www.devtrends.co.uk/blog/donut-output-caching-in-asp.net-mvc-3#125

我在这里和 Codeplex 上查找错误但没有找到。

环境是中等信任!

路线

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
    routes.IgnoreRoute("{*favicon}", new { favicon = @"(.*/)?favicon.ico(/.*)?" });
    routes.IgnoreRoute("elmah.axd");

    routes.MapRoute(
        "Default", // Route name
        "{controller}/{action}/{id}", // URL with parameters
        new { controller = "Home", action = "Index", id = UrlParameter.Optional }, // Parameter defaults
        new[] { "LetsGo.Controllers" }
    );
}

Controller

[DonutOutputCache(CacheProfile = "StaticPage")]
public ActionResult Index()
{
        return View(_themeParty.Repository.Query().Published(true).ToList());
}

[ChildActionOnly]
[DonutOutputCache(CacheProfile = "DataCache")]
public PartialViewResult Subsidiaries() { return PartialView(_subsidiaries.Repository.Query().Published().ToList()); }

网页配置

<caching>
    <outputCacheSettings>
    <outputCacheProfiles>
        <add name="DataCache" enabled="true" duration="10800" varyByParam="*" />
        <add name="StaticPage" enabled="true" duration="21600" varyByParam="*" />
        <add name="ByHeader" enabled="true" duration="300" varyByHeader="*" />
    </outputCacheProfiles>
    </outputCacheSettings>
</caching>

_Layout.cshtml

...
 @Html.Action("Subsidiaries", "Home", new { area = "" })
...

完全错误

Server Error in '/LetsGo' Application.

Object reference not set to an instance of an object.

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.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   DevTrends.MvcDonutCaching.KeyGenerator.GenerateKey(ControllerContext context, CacheSettings cacheSettings) +777
   DevTrends.MvcDonutCaching.DonutOutputCacheAttribute.ExecuteCallback(ControllerContext context, Boolean hasErrors) +43
   System.Web.Mvc.ControllerActionInvoker.InvokeExceptionFilters(ControllerContext controllerContext, IList`1 filters, Exception exception) +168
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +652
   System.Web.Mvc.Controller.ExecuteCore() +161
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +304
   System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +61
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +19
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +461
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +370

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272

Answer 1

似乎有一个错误:

http://mvcdonutcaching.codeplex.com/workitem/2533