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我只是想在.Net 4.0 上从 EF 4.3 升级到 EF 5

当我使用运行迁移时，update-database我得到了这个：

System.Data.MetadataException: Schema specified is not valid. Errors: 
(0,0) : warning 0005: Could not find schema information for the attribute 'Namespace'.
(0,0) : warning 0005: Could not find schema information for the attribute 'Provider'.
(0,0) : warning 0005: Could not find schema information for the attribute 'ProviderManifestToken'.
(0,0) : warning 0005: Could not find schema information for the attribute 'Alias'.
(0,0) : error 0010: The element Schema in namespace http://schemas.microsoft.com/ado/2009/11/edm/ssdl was unexpected for the root element. The expected Schema in one of the following namespaces: http://schemas.microsoft.com/ado/2006/04/edm/ssdl, http://schemas.microsoft.com/ado/2009/02/edm/ssdl.
   at System.Data.Metadata.Edm.StoreItemCollection.Loader.ThrowOnNonWarningErrors()
   at System.Data.Metadata.Edm.StoreItemCollection.Loader.LoadItems(IEnumerable`1 xmlReaders, IEnumerable`1 sourceFilePaths)
   at System.Data.Metadata.Edm.StoreItemCollection.Init(IEnumerable`1 xmlReaders, IEnumerable`1 filePaths, Boolean throwOnError, DbProviderManifest& providerManifest, DbProviderFactory& providerFactory, String& providerManifestToken, Memoizer`2& cachedCTypeFunction)
   at System.Data.Metadata.Edm.StoreItemCollection..ctor(IEnumerable`1 xmlReaders)
   at System.Data.Entity.Migrations.Extensions.XDocumentExtensions.GetStoreItemCollection(XDocument model, DbProviderInfo& providerInfo)
   at System.Data.Entity.Migrations.Infrastructure.EdmModelDiffer.Diff(XDocument sourceModel, XDocument targetModel, String connectionString)
   at System.Data.Entity.Migrations.DbMigrator.IsModelOutOfDate(XDocument model, DbMigration lastMigration)
   at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
   at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
   at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
   at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
   at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.RunCore()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
Schema specified is not valid. Errors: 
(0,0) : warning 0005: Could not find schema information for the attribute 'Namespace'.
(0,0) : warning 0005: Could not find schema information for the attribute 'Provider'.
(0,0) : warning 0005: Could not find schema information for the attribute 'ProviderManifestToken'.
(0,0) : warning 0005: Could not find schema information for the attribute 'Alias'.
(0,0) : error 0010: The element Schema in namespace http://schemas.microsoft.com/ado/2009/11/edm/ssdl was unexpected for the root element. The expected Schema in one of the following namespaces: http://schemas.microsoft.com/ado/2006/04/edm/ssdl, http://schemas.microsoft.com/ado/2009/02/edm/ssdl.

在.Net 4.0上有什么办法可以通过这个吗？我知道 EF 5 的某些功能在 .Net 4 上不可用。但我无法升级到 .Net 4.5 或 VS 2012，因为我的 SSD 只有 60GB，目前它只有 4GB 可用空间，所以 VS2012 安装程序赢了不要让我安装它（即使在其他驱动器上）。

Web.config 参考了这个：

<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
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1 回答 1

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当您使用 .NET Framework 4 更新数据库时，存储在数据库中的模型似乎具有 v3 架构。.NET Framework 4 中的 EF 组件不理解 v3（仅 v2）架构，因此会出现错误。我相信您需要迁移到 .NET Framework 4.5 和 VS2012。

于 2013-01-07T21:16:01.743 回答