不明な例外が発生しています。基本的に、次のコードは 2000 個のアイテムのみをループしますが、最後に到達するまでに数分かかり、opResult = uow.Commit();その時点で失敗したと表示されます。私は完全に困惑しています。誰でも助けてもらえますか？
public OperationResult PopulateReadingList(int readingListID, PrePopulateType dataType, GroupType[] groups)
{
var opResult = new OperationResult();
var listItemsToReturn = new List<ReadingListItem>();
try
{
Func<short?, Lookup_Countries> getCountry = c => NeptuneUnitOfWork.Countries.FindByID(c);
Func<string, bool> isEmptyString = string.IsNullOrEmpty;
using (var uow = NeptuneUnitOfWork)
{
var predicate = BuildPredicate(groups);
var items = uow.ReadingList.FindWhere(r=>r.ID==readingListID).SelectMany(m=> m.ReadingListMediaChannels).Where(predicate).ToList();
foreach (var readingListMediaChannel in items)
{
string value = string.Empty;
var country = getCountry(readingListMediaChannel.MediaChannel.CountryID);
switch (dataType)
{
case PrePopulateType.Country:
value = country != null?country.Name:string.Empty;
break;
case PrePopulateType.Region:
value = country != null?country.Lookup_SubRegions.Lookup_Regions.Name : string.Empty;
break;
case PrePopulateType.SubRegion:
value = country != null ? country.Lookup_SubRegions.Name:string.Empty;
break;
case PrePopulateType.MediaType:
value = readingListMediaChannel.MediaChannel.MediaType.Name;
break;
default:
break;
}
foreach (var group in groups)
{
switch (group)
{
case GroupType.Group1:
if (isEmptyString(readingListMediaChannel.Group1))
{
readingListMediaChannel.Group1 = value;
}
break;
case GroupType.Group2:
if (isEmptyString(readingListMediaChannel.Group2))
{
readingListMediaChannel.Group2 = value;
}
break;
case GroupType.Group3:
if (isEmptyString(readingListMediaChannel.Group3))
{
readingListMediaChannel.Group3 = value;
}
break;
case GroupType.Group4:
if (isEmptyString(readingListMediaChannel.Group4))
{
readingListMediaChannel.Group4 = value;
}
break;
case GroupType.Group5:
if (isEmptyString(readingListMediaChannel.Group5))
{
readingListMediaChannel.Group5 = value;
}
break;
default:
break;
}
}
listItemsToReturn.Add(new ReadingListItem
{
Group1 = readingListMediaChannel.Group1,
Group2 = readingListMediaChannel.Group2,
Group3 = readingListMediaChannel.Group3,
Group4 = readingListMediaChannel.Group4,
Group5 = readingListMediaChannel.Group5,
MediaCode = readingListMediaChannel.MediaChannel.NeptuneMediaID,
MediaID = readingListMediaChannel.MediaChannelID,
MediaName = readingListMediaChannel.MediaChannel.Name,
MediaTypeID = readingListMediaChannel.MediaChannel.MediaTypeID,
MediaTypeName = readingListMediaChannel.MediaChannel.MediaType.Name
});
}
opResult = uow.Commit();
}
}
catch (Exception ex)
{
Logger.Error(ex);
opResult.Success = false;
opResult.SetExceptionProperties(ex);
}
return opResult;
}
以下は、このレポを呼び出すコントローラーによって返されるエラー メッセージです。
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:
[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