应用程序配置文件中的连接字符串“MyConnection”不包含必需的providerName属性。 [英] The connection string 'MyConnection' in the application's configuration file does not contain the required providerName attribute."

问题描述

我使用实体框架代码首先，

我的连接字符串在配置文件中：

My connection string is in a configuration file:

<connectionStrings>
    <clear/>
    <add name="ApplicationServices" connectionString="Data Source=PC-X;Initial Catalog=MYdb;Integrated Security=True"/>
  </connectionStrings>

当我尝试访问数据（应该创建数据库的东西）会下降，出现以下错误：

When I try to access the data (something that should create the DB) is falling with the following error:

The connection string 'ApplicationServices' in the application's configuration file does not contain the required providerName attribute."

我缺少什么？

推荐答案

在 connectionString 属性（假设您使用SQL）之后，您缺少以下代码：

You're missing the following piece of code after the connectionString attribute (assuming that you're using SQL):

providerName =System.Data.SqlClient

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