一些背景知识:

我有一个具有以下结构的 DLL 项目:

Rivworks.Model (project)  
  \Negotiation (folder)  
      Model.edmx (model from DB #1)  
  \NegotiationAutos (folder)  
      Model.edmx (model from DB #2)  

我已将连接字符串从该项目的 app.config 移至 web.config 文件。它们不在 ConnectionString 部分。相反，我有一个静态类，它使用部分 web.config 并将它们作为 AppSettings.[settingName] 公开给我的应用程序。

<FeedAutosEntities_connString>metadata=res://*/;provider=System.Data.SqlClient;provider connection string='Data Source=db4;Initial Catalog=RivFeeds;Persist Security Info=True;User ID=****;Password=&quot;****&quot;;MultipleActiveResultSets=True'</FeedAutosEntities_connString>
<RivWorkEntities_connString>metadata=res://*/NegotiationAutos.NegotiationAutos.csdl|res://*/NegotiationAutos.NegotiationAutos.ssdl|res://*/NegotiationAutos.NegotiationAutos.msl;provider=System.Data.SqlClient;provider connection string='Data Source=db2;Initial Catalog=RivFramework_Dev;Persist Security Info=True;User ID=****;Password=&quot;****&quot;;MultipleActiveResultSets=True'</RivWorkEntities_connString>

我有 2 个类，每个 Context 一个，它们看起来像这样:

namespace RivWorks.Model
{
    public class RivWorksStore
    {
        private RivWorks.Model.Negotiation.Entities _dbNegotiation;

        public RivWorksStore(string connectionString, string metadata, string provider)
        {
            EntityConnectionStringBuilder entityBuilder = new EntityConnectionStringBuilder();
            entityBuilder.ConnectionString = connectionString;
            entityBuilder.Metadata = "res://*/";    // metadata;
            //entityBuilder.Provider = provider;
            _dbNegotiation = new RivWorks.Model.Negotiation.Entities(entityBuilder.ConnectionString);
        }

        public RivWorks.Model.Negotiation.Entities NegotiationEntities()
        {
            return _dbNegotiation;
        }
    }
}

namespace RivWorks.Model
{
    public class FeedStoreReadOnly
    {
        private RivWorks.Model.NegotiationAutos.Entities _dbFeed;

        public FeedStoreReadOnly(string connectionString, string metadata, string provider)
        {
            EntityConnectionStringBuilder entityBuilder = new EntityConnectionStringBuilder();
            entityBuilder.ConnectionString = connectionString;
            entityBuilder.Metadata = "res://*/";    // metadata;
            //entityBuilder.Provider = provider;
            _dbFeed = new RivWorks.Model.NegotiationAutos.Entities(entityBuilder.ConnectionString);
        }

        public RivWorks.Model.NegotiationAutos.Entities ReadOnlyEntities()
        {
            return _dbFeed;
        }
    }
}

您会注意到元数据正在被重写为一个简短的版本。

当我在每个类中注释掉该行时，我收到此错误:

Unable to load the specified metadata resource.

当我在每个类中留下该行时，我收到此错误:

Schema specified is not valid. Errors:

Negotiation.Model.csdl(3,4) : error 0019: The EntityContainer name must be unique. An EntityContainer with the name 'Entities' is already defined.

我知道这很简单，很明显。欢迎任何建议...

最佳答案

劫持它，因为它是错误消息的最高谷歌结果。

万一其他人在仅使用单个模型/上下文时遇到此问题:我曾经遇到过这个问题，因为包含模型/上下文的程序集已重命名并且具有以前名称的副本保留在应用程序的 bin 目录中。解决方案是删除旧的程序集文件。

关于c# - EntityContainer 名称必须是唯一的。已定义名称为 'Entities' 的 EntityContainer，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2060278/