问题描述
我已经看到一些，当创建新的DbContext时，将实体框架连接字符串作为构造函数参数。但是当我将一个新的ADO.NET实体数据模型添加到一个项目（数据库中）时，DbContext只有一个无参数的构造函数。
I have seen some code sample that put an entity framework connection string as a constructor argument when creating a new DbContext. But when I added a new ADO.NET entity data model into a project (database first), the DbContext only has one parameterless constructor.
我错过了一步吗？我应该怎么做才能获得该构造函数？
Did I miss a step? What should I do to get that constructor?
Visual Studio 2012定位.net框架4.5实体框架5。
Visual Studio 2012 targeting .net framework 4.5 entity framework 5.
推荐答案
根据Arthur Vickers的建议，我将部分类扩展为接受连接字符串的构造函数。在C＃（非常类似于hege的答案）：
As per Arthur Vickers' suggestion, I am extending the partial class to have a constructor that accepts connection string. In C# (very similar to hege's answer):
public partial class MyEFEntities
{
public MyEFEntities(string connectionstring)
: base(connectionstring)
{
}
}
或在VB.Net中：
Partial Public Class MyEFEntities
Public Sub New(ConnectionString As String)
MyBase.New(ConnectionString)
End Sub
End Class
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