c# - 错误 : This operation would create an incorrectly structured document

Question

我一直在尝试安装 Entity Framework 6，但它总是返回错误

error: This operation would create an incorrectly structured document.

我已经卸载了对这个位置提到的每个 dll 的所有引用。 http://entityframework.codeplex.com/wikipage?title=Updating%20Applications%20to%20use%20EF6

疯狂的是，我可以创建一个新项目，创建一个 webAPI 程序，并尝试添加 Entity Framework 6，但我得到了同样的错误，即使在删除了对 System.Data.Entity.dll 的所有引用之后 我已经做了几天，需要认真的帮助。

我该怎么做才能安装 Entity Framework 6？

注意:它只会将 find 安装到类库中，而不是 WebApi 或 MVC 应用程序。

---

如果有帮助，这里有一些更详细的错误信息。

PM> Install-Package EntityFramework -Version 6.0.0
Installing 'EntityFramework 6.0.0'.
Successfully installed 'EntityFramework 6.0.0'.
Adding 'EntityFramework 6.0.0' to AC.
Successfully added 'EntityFramework 6.0.0' to AC.
System.InvalidOperationException: This operation would create an incorrectly structured document.
   at System.Xml.Linq.XDocument.ValidateDocument(XNode previous, XmlNodeType allowBefore, XmlNodeType allowAfter)
   at System.Xml.Linq.XDocument.ValidateNode(XNode node, XNode previous)
   at System.Xml.Linq.XContainer.AddNodeSkipNotify(XNode n)
   at System.Xml.Linq.XContainer.AddContentSkipNotify(Object content)
   at System.Xml.Linq.XContainer.Add(Object content)
   at System.Data.Entity.Migrations.Extensions.XContainerExtensions.GetOrCreateElement(XContainer container, String elementName, XAttribute[] attributes)
   at System.Data.Entity.ConnectionFactoryConfig.ConfigFileManipulator.AddOrUpdateConfigSection(XDocument config, Version entityFrameworkVersion)
   at System.Data.Entity.ConnectionFactoryConfig.InitializeEntityFrameworkCommand.<>c__DisplayClass3.<Execute>b__1(XDocument c)
   at System.Data.Entity.ConnectionFactoryConfig.ConfigFileProcessor.ProcessConfigFile(ProjectItem configItem, IEnumerable`1 manipulators)
   at System.Data.Entity.ConnectionFactoryConfig.InitializeEntityFrameworkCommand.<>c__DisplayClass3.<Execute>b__0(ProjectItem i)
   at System.Data.Entity.ConnectionFactoryConfig.ConfigFileFinder.FindConfigFiles(ProjectItems items, Action`1 action)
   at System.Data.Entity.ConnectionFactoryConfig.InitializeEntityFrameworkCommand.Execute()
   at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
Uninstalling 'EntityFramework 6.0.0'.
Successfully uninstalled 'EntityFramework 6.0.0'.
Install failed. Rolling back...
Install-Package : This operation would create an incorrectly structured document.
At line:1 char:16
+ Install-Package <<<<  EntityFramework -Version 6.0.0
    + CategoryInfo          : NotSpecified: (:) [Install-Package], RuntimeException
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

Answer 1

我遇到了同样的问题。事实证明，我正在将 EF 添加到我的一个非常古老的项目中，并且 web.config 为 <configuration /> 定义了这个命名空间。元素:

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">

删除命名空间声明 ( xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0") 有助于解决这个问题。