已添加具有相同键的项目 - 仅在发布模式下
本文关键字:布模式 模式 添加 项目 | 更新日期: 2023-09-27 18:31:32
专家,
我在运行时第一次使用实体框架函数时就得到了这个 System.ArgumentException(已经添加了具有相同键的项目)。奇怪的是:如果我使用调试模式,它可以正常工作。编译相同的代码后,在发布模式下不做任何更改后,它会立即崩溃,但本文顶部提到了异常。
有谁知道更多关于这种奇怪的行为?我该如何解决它?我无法向我的客户推出调试版本:(
此时会引发异常:
try
{
var blub = context.ExecuteStoreQuery<int>(QueryString);
}
catch (Exception ex)
{
// ...
}
堆栈跟踪:
System.ArgumentException: An item with the same key has already been added.
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boo
lean add)
at System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadRelationshi
pTypes()
at System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadTypesFromAs
sembly()
at System.Data.Metadata.Edm.ObjectItemAssemblyLoader.Load()
at System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.Load()
at System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boo
lean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData)
at System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boo
lean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData)
at System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boo
lean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData)
at System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boo
lean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData)
at System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boo
lean loadReferencedAssemblies, KnownAssembliesSet knownAssemblies, EdmItemCollec
tion edmItemCollection, Action`1 logLoadMessage, Object& loaderCookie, Dictionar
y`2& typesInLoading, List`1& errors)
at System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(Object
ItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAs
semblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage)
at System.Data.Metadata.Edm.MetadataWorkspace.ImplicitLoadAssemblyForType(Typ
e type, Assembly callingAssembly)
at System.Data.Objects.ObjectContext.ExecuteStoreQueryInternal[TElement](Stri
ng commandText, String entitySetName, MergeOption mergeOption, Object[] paramete
rs)
首先,确保即使你做了一个干净的发布版本,也会遇到错误(我的意思是在运行构建之前没有二进制文件,只有源代码)。如果没有,请修复项目设置(例如,隔离调试和发布生成目标文件夹)。
如果错误只发生一次,之后应用程序运行正常,则一定有一些同步问题。虽然这很奇怪,因为元数据加载似乎是同步的。但无论如何,EF 对象都不是线程安全的。不要在跨线程方案中使用它们。
如果上面说的没有帮助,那么也许我的研究结果会对你有所帮助。下面是与错误相关的 EF 源代码摘录:
//----------------------------------------------------------------------
// <copyright file="ObjectItemAttributeAssemblyLoader.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner [....]
// @backupOwner [....]
//---------------------------------------------------------------------
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Objects.DataClasses;
using System.Diagnostics;
using System.Reflection;
namespace System.Data.Metadata.Edm
{
/// <summary>
/// Class for representing a collection of items for the object layer.
/// Most of the implemetation for actual maintainance of the collection is
/// done by ItemCollection
/// </summary>
internal sealed class ObjectItemAttributeAssemblyLoader :
ObjectItemAssemblyLoader
{
// ...
/// <summary>
/// This method loads all the relationship type that this entity takes part in
/// </summary>
/// <param name="entityType"></param>
/// <param name="context"></param>
private void LoadRelationshipTypes()
{
foreach (EdmRelationshipAttribute roleAttribute in
SourceAssembly.GetCustomAttributes(typeof(EdmRelationshipAttribute), false /*inherit*/))
{
// Check if there is an entry already with this name
if (TryFindNullParametersInRelationshipAttribute(roleAttribute))
{
// don't give more errors for these same bad parameters
continue;
}
bool errorEncountered = false;
// return error if the role names are the same
if (roleAttribute.Role1Name == roleAttribute.Role2Name)
{
SessionData.EdmItemErrors.Add(new EdmItemError(
System.Data.Entity.Strings.SameRoleNameOnRelationshipAttribute(roleAttribute.RelationshipName, roleAttribute.Role2Name),
null));
errorEncountered = true;
}
if (!errorEncountered)
{
AssociationType associationType = new AssociationType(
roleAttribute.RelationshipName, roleAttribute.RelationshipNamespaceName,
roleAttribute.IsForeignKey, DataSpace.OSpace);
SessionData.TypesInLoading.Add(associationType.FullName, associationType);
TrackClosure(roleAttribute.Role1Type);
TrackClosure(roleAttribute.Role2Type);
// prevent lifting of loop vars
string r1Name = roleAttribute.Role1Name;
Type r1Type = roleAttribute.Role1Type;
RelationshipMultiplicity r1Multiplicity = roleAttribute.Role1Multiplicity;
AddTypeResolver(() =>
ResolveAssociationEnd(associationType, r1Name, r1Type, r1Multiplicity));
// prevent lifting of loop vars
string r2Name = roleAttribute.Role2Name;
Type r2Type = roleAttribute.Role2Type;
RelationshipMultiplicity r2Multiplicity = roleAttribute.Role2Multiplicity;
AddTypeResolver(() =>
ResolveAssociationEnd(associationType, r2Name, r2Type, r2Multiplicity));
// get assembly entry and add association type to the list of types in the assembly
Debug.Assert(!CacheEntry.ContainsType(associationType.FullName), "Relationship type must not be present in the list of types");
CacheEntry.TypesInAssembly.Add(associationType);
}
}
}
// ...
}
}
该方法中使用的唯一字典是 SessionData.TypesInLoading
。关键是RelationshipName
和RelationshipNamespaceName
的组合。有趣的是,注释说他们检查重复的键,但该方法TryFindNullParametersInRelationshipAttribute
只检查属性的属性是否null
。我想这是一个错误。
但更重要的是,所描述的错误一定发生了,因为程序集中的某个地方有多个EdmRelationshipAttribute
,RelationshipName
属性和RelationshipNamespaceName
属性的组合相等。可能有多种原因:
- EDMX 文件不正确。
- 不当复制的程序集,
- 发布配置将其生成结果输出到与调试配置相同的文件夹,
- 手动生成 EF 映射程序集时出错,
- 等。
不幸的是,抓住破裂关系的名字将非常困难。您可能必须在 System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadRelationshipTypes()
处设置断点并在反汇编中跟踪它。我会说这几乎是不可能的,因为Dictionary.Insert
方法即将被调用很多次。
如果所有这些仍然不能建议解决方案,那么您确实需要准备问题的重现并将其发布在此处。否则没有人能够提供帮助。