数据库优先或模型优先不支持来自DbContext的DbModelBuilder或EDMX。错误引发行context.Business_Type.ToList(); [英] Database First or Model First is not supported DbModelBuilder or EDMX from a DbContext .the error raises on line context.Business_Type.ToList();
问题描述
我首先使用Model(sql server)作为我的MVC项目。如果我想在没有任何断点的情况下推送F5,则会因为第一次调用方法根据上下文查询数据库而引发错误。
错误是:
"不支持创建DbModelBuilder或从使用Database First或Model First创建的DbContext编写EDMX。 EDMX只能从不使用现有DbCompiledModel创建的Code First DbContext中获得。我使用EF.4和
我通过图表更新我的模型。
*但是如果我使用F10 / F11它会成功通过该行,其余的则通过在上下文中查询它的方法与F5一起使用。
问题仅在于第一种调用方法。
  BApp_Entities上下文;
      public RepositoryBusinessType()
      {
          context = new BApp_Entities();
      }
&NBSP; &NBSP; &NBSP; public IList< Models.Business_Type> GetAll()
&NBSP; &NBSP; &NBSP; {
&NBSP; &NBSP; &NBSP; &NBSP; &NBSP; return context.Business_Type.ToList();
&NBSP; &NBSP; &NBSP; }
context是我模型的一个实例,然后我需要进行查询以检索我的数据,例如:context.Business_Type.ToList();
错误引发行context.Business_Type.ToList();
I use Model first(sql server) for my MVC project. If I want to push F5 without any break point it raises an error for for first calling method to query the database base on context.
The error is:
"Creating a DbModelBuilder or writing the EDMX from a DbContext created using Database First or Model First is not supported. EDMX can only be obtained from a Code First DbContext created without using an existing DbCompiledModel." I use EF.4 and
I update my model through diagram.
*But if I use F10/F11 it passes that line successfully and for the rest methods which query on context it works fine with F5.
The problem is only with the first calling method.
BApp_Entities context;
public RepositoryBusinessType()
{
context = new BApp_Entities();
}
public IList<Models.Business_Type> GetAll()
{
return context.Business_Type.ToList();
}
context is a instance of my model,then I need to make a query to retrieve my data,like:context.Business_Type.ToList();
the error raises on line context.Business_Type.ToList();
推荐答案
嗨David Rikardson,
Hi David Rikardson,
请打开您的模型(Edmx文件)右键单击空位 - >从数据库更新模型 - >选择修改后的表格以在模型中更新。
Please open your model (Edmx file) right click empty place -> Update Model from database -> choose the modified table to update them in model.
如果问题仍然存在,请您分享一个简单的示例,通过OneDrive重现问题。
If the issue still exists, could you please share a simple sample to reproduce the issue via OneDrive.
致以最诚挚的问候,
张龙
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