无法创建对象上下文 [英] Unable to create object context

问题描述

在ASP.NET MVC中使用Entity框架时，我得到无法创建对象上下文错误。

I'm getting the Unable to create object context error when using Entity framework in ASP.NET MVC.

每当我将 POST 给控制器时，我没有收到回复。我尝试直接访问控制器的方法 / Data / GetAll ，并收到此错误：

Every time I POST to the controller I'm not getting a response back. I tried going directly to the method of the controller /Data/GetAll, and receive this error:

在配置中找不到指定的命名连接是
，
不打算与$ b一起使用$ b EntityClient提供者，或无效。
描述：执行
当前Web请求期间发生未处理的异常
。请查看
堆栈跟踪，了解有关
错误的更多信息，以及
中的代码。

The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid. 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.

异常详细信息：
System.ArgumentException：
指定的命名连接是在配置中找不到
，而不是
用于
EntityClient提供者，或无效。

Exception Details: System.ArgumentException: The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid.

引发异常的代码段：

Code Snippet that throws exception:

public class TrackItContextCreator {
    public ObjectContext Create() {
        ObjectContext context = new ObjectContext("name=TrackItDBEntities");

        context.DefaultContainerName = "TrackItDBEntities";

        return context;
    }
}

Web.config

Web.config

<add name="TrackItDBEntities" connectionString="metadata=res://*
/EntityFramework.TrackItDBModel.csdl|res://*/EntityFramework.TrackItDBModel.ssdl|res:
//*/EntityFramework.TrackItDBModel.msl;provider=System.Data.SqlClient;provider
 connection string=&quot;Data Source=host;User ID=myuseracc;Password=******;
MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient" />

我可能缺少什么？

推荐答案

从评论中，我想我知道问题是什么。

From the comments, I think I know what the problem is.

如果模型在单独的程序集中，以确保在 app.config / web.config 中指定连接字符串 / em>使用模型的程序集。我猜你只有在模特儿项目中。

If the model is in a separate assembly, you basically have to make sure that the connection string is specified in the app.config/web.config of every assembly that uses the model. I'm guessing that you only have it in the model project.

请参阅这个问题为另一个例子，而 MSDN上的这个线程。涉及模型的两个类似问题都在单独的项目/组件中。我99％确定这与您的问题有关。

See this question for another example, and this thread on MSDN. Both similar issues involving models being in separate projects/assemblies. I'm 99% sure that this is related to your issue.

这篇关于无法创建对象上下文的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！