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我正在将 .NET Framework 4.0 站点从 1 个 Web 主机转移到另一个。现有主机上的站点似乎按预期工作。但是，在将站点文件和数据库传输到新主机并修复 web.config 连接字符串以指向新数据库后，尝试访问从数据库中提取的页面时出现错误。

我没有编写该站点，但它似乎使用了代码优先设置。

Server Error in '/' Application.
An item with the same key has already been added.
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.ArgumentException: An item with the same key has already been added.

Source Error:


Line 130:                if ((_Jobs == null))
Line 131:                {
Line 132:                    _Jobs = base.CreateObjectSet<Job>("Jobs");
Line 133:                }
Line 134:                return _Jobs;

传输文件后，我尝试从新数据库服务器重建 edmx 文件。我知道我的连接字符串正在工作，因为我编写了一个小测试，通过相同的连接字符串连接到数据库并且它能够检索数据。

从工作状态复制代码库后，我对代码库所做的唯一更改是对 web.config 的数据库连接字符串。

旧主机与新主机的唯一真正显着区别是旧主机使用 SQLEXPRESS（未知版本），而新主机使用 MSSQL 2008。

堆栈跟踪：

[ArgumentException: An item with the same key has already been added.]
   System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) +52
   System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +9378779
   System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadRelationshipTypes() +650
   System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadTypesFromAssembly() +17
   System.Data.Metadata.Edm.ObjectItemAssemblyLoader.Load() +25
   System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.Load() +4
   System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData) +160
   System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, KnownAssembliesSet knownAssemblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage, Object& loaderCookie, Dictionary`2& typesInLoading, List`1& errors) +166
   System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage) +316
   System.Data.Metadata.Edm.ObjectItemCollection.ImplicitLoadAssemblyForType(Type type, EdmItemCollection edmItemCollection) +84
   System.Data.Metadata.Edm.MetadataWorkspace.ImplicitLoadAssemblyForType(Type type, Assembly callingAssembly) +151
   System.Data.Objects.ObjectContext.GetTypeUsage(Type entityCLRType) +35
   System.Data.Objects.ObjectContext.GetEntitySetForNameAndType(String entitySetName, Type entityCLRType, String exceptionParameterName) +33
   System.Data.Objects.ObjectContext.CreateObjectSet(String entitySetName) +66
   PR.PRModel.PREntities.get_Jobs() in \\n5200-2\iis7_www\p\e\personallyrecommended.com.au\www\App_Code\PRModel.Designer.cs:132
   Careers.LoadJob() in \\n5200-2\iis7_www\p\e\personallyrecommended.com.au\www\Careers.aspx.cs:24
   Careers.Page_Load(Object sender, EventArgs e) in \\n5200-2\iis7_www\p\e\personallyrecommended.com.au\www\Careers.aspx.cs:16
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207


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

连接字符串：

<connectionStrings>
<add name="PREntities" connectionString="metadata=res://*/App_Code.PRModel.csdl|res://*/App_Code.PRModel.ssdl|res://*/App_Code.PRModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=myserver.com;Initial Catalog=mydatabase;Persist Security Info=True;User ID=username;Password=password;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient" />
<add name="ConnectionStringDB" connectionString="Data Source=myserver.com;Initial Catalog=mydatabase;Persist Security Info=True;User ID=username;Password=password" providerName="System.Data.SqlClient" />
</connectionStrings>
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