0

我使用 asp.net mvc，控制器和存储库可以正常工作。

这是存储库：

public IEnumerable<ReadingListMediaChannel> GetReadingListsById(int readingListId)
        {
            try
            {
                var x = NeptuneUnitOfWork.ReadingList.FindByID(readingListId).ReadingListMediaChannels.ToList();
                return x;
            }
            catch (Exception ex)
            {
                Logger.Error("GetReadingLists - failed to retrieve reading lists.", ex);
                throw;
            }
        }

当计算完成并且我试图返回 2067 个对象的 JsonResult 但我得到以下异常：

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.


[ObjectDisposedException: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.]
   System.Data.Objects.ObjectContext.EnsureConnection() +11448512
   System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +66
   System.Data.Objects.DataClasses.EntityReference`1.Load(MergeOption mergeOption) +229
   System.Data.Objects.DataClasses.RelatedEnd.DeferredLoad() +497
   System.Data.Objects.Internal.LazyLoadBehavior.LoadProperty(TItem propertyValue, String relationshipName, String targetRoleName, Boolean mustBeNull, Object wrapperObject) +157
   System.Data.Objects.Internal.<>c__DisplayClass7`2.<GetInterceptorDelegate>b__2(TProxy proxy, TItem item) +149
   System.Data.Entity.DynamicProxies.ReadingListMediaChan_AA75ADD44097B0AF40DBB84D6E509EE9D2EA11F705268633DBD1D4743DEEA37B.get_MediaChannel() +151

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
   System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) +0
   System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) +229
   System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +193
   System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) +35
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeCustomObject(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +733
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +1968
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +166
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeEnumerable(IEnumerable enumerable, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat) +195
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValueInternal(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +1923
   System.Web.Script.Serialization.JavaScriptSerializer.SerializeValue(Object o, StringBuilder sb, Int32 depth, Hashtable objectsInUse, SerializationFormat serializationFormat, MemberInfo currentMember) +166
   System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj, SerializationFormat serializationFormat) +114
   System.Web.Mvc.JsonResult.ExecuteResult(ControllerContext context) +282
   System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() +33
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +726368
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +265
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +726324
   System.Web.Mvc.Controller.ExecuteCore() +159
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +334
   System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +62
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +15
   System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +52
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +606
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288
4

2 回答 2

3

堆栈跟踪中的以下行：

System.Data.Objects.Internal.LazyLoadBehavior.LoadProperty(

表示他的问题与对延迟加载的属性的访问有关，然后在会话关闭后访问。

于 2013-05-24T11:44:03.990 回答
0

而不是返回使用慢 JavascriptSerializer 的 JsonResult，而是直接使用其他一些序列化器和序列化器到 Response.OutputStream。

在当前使用 Newtonsoft.Json 的示例中

public void Test()
{
    var sampleData = new {foo = "bar"};

    var serializer = new JsonSerializer();

    Response.ContentType = "application/json";
    using (var textWriter = new StreamWriter(Response.OutputStream))
    {
        serializer.Serialize(textWriter, sampleData);
    }
}
于 2013-05-24T11:40:28.807 回答