使用DI工具unity创建EF ObjectContext对象

Question

我尝试使用下面的脚本在容器中注册类型，它运行良好

 Container.RegisterType<System.Data.Objects.ObjectContext,
              ExSS.Repository.MyEntity>( "myentity", new InjectionConstructor());

，但是，当我尝试使用 xml 配置时：

<alias alias="ObjectContext" 
        type="System.Data.Objects.ObjectContext,System.Data.Entity" />
<alias alias="MyEntity" type="ExSS.Repository.MyEntity,ExSS.Repository"/>
<register type="ExSS.Repository.MyEntity,ExSS.Repository" mapTo="MyEntity" 
        name="myentity">
    <constructor></constructor>
</register>

它不起作用。错误消息是：

The type name or alias ObjectContext could not be resolved. Please check your 
configuration file and verify this type name. 

描述：

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. 

异常详细信息：

System.InvalidOperationException: The type name or alias ObjectContext could 
not be resolved. Please check your configuration file and verify this type name.

堆栈跟踪是：

[InvalidOperationException: The type name or alias ObjectContext could not be resolved. Please check your configuration file and verify this type name.]
   Microsoft.Practices.Unity.Configuration.ConfigurationHelpers.TypeResolverImpl.ResolveType(String typeNameOrAlias, Boolean throwIfResolveFails) +200
   Microsoft.Practices.Unity.Configuration.ConfigurationHelpers.TypeResolver.ResolveType(String typeNameOrAlias) +59
   Microsoft.Practices.Unity.Configuration.RegisterElement.GetRegisteringType() +70
   Microsoft.Practices.Unity.Configuration.RegisterElement.ConfigureContainer(IUnityContainer container) +111
   Microsoft.Practices.Unity.Configuration.ContainerConfiguringElement.ConfigureContainerInternal(IUnityContainer container) +39
   Microsoft.Practices.Unity.Configuration.<>c__DisplayClass1.<ConfigureContainer>b__0(ContainerConfiguringElement element) +42
   Microsoft.Practices.ObjectBuilder2.EnumerableExtensions.ForEach(IEnumerable`1 sequence, Action`1 action) +200
   Microsoft.Practices.Unity.Configuration.ContainerElement.ConfigureContainer(IUnityContainer container) +269
   Microsoft.Practices.Unity.Configuration.UnityConfigurationSection.Configure(IUnityContainer container, String configuredContainerName) +133
   Microsoft.Practices.Unity.Configuration.UnityContainerExtensions.LoadConfiguration(IUnityContainer container, UnityConfigurationSection section, String containerName) +70

任何人都可以给出一些建议吗？非常感谢

Answer 1

找到原因，与CLR无法正确加载程序集System.Data.Entity有关。应添加 publicktokenkey 以及文化和版本。以下配置有效：

<alias alias="ObjectContext" type="System.Data.Objects.ObjectContext, System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" /> 
<alias alias="MyEntity" type="ExSS.Repository.MyEntity, ExSS.Repository"/> 
<register type="ObjectContext" mapTo="MyEntity" name="myentity"> 
  <constructor /> 
</register>

Answer 2

你的配置是错误的。应该是：

<alias alias="ObjectContext" type="System.Data.Objects.ObjectContext, System.Data.Entity" />
<alias alias="MyEntity" type="ExSS.Repository.MyEntity, ExSS.Repository"/>
<register type="ObjectContext" mapTo="MyEntity" name="myentity">
    <constructor />
</register>