无法访问ASP.NET配置工具

Question

当我想访问ASP.NET配置工具时，它会显示以下错误消息：

There is a problem with your selected data store. This can be caused by an invalid server name or credentials, or by insufficient permission. It can also be caused by the role manager feature not being enabled. Click the button below to be redirected to a page where you can choose a new data store. 

The following message may help in diagnosing the problem: Unable to connect to SQL Server database.

我能做什么。 在访问之前，是否应该设置任何配置？

我正在使用带有内置连接字符串的ASP.Net MVC4项目。

<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-AccountPortal-20131128183241;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-AccountPortal-20131128183241.mdf" providerName="System.Data.SqlClient" />

Answer 1

您应先从web.config文件访问connection string ，然后再继续操作。

web.config文件 ：

<connectionStrings>
  <add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-AccountPortal-20131128183241;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-AccountPortal-20131128183241.mdf" providerName="System.Data.SqlClient" />
</connectionStrings>

来自代码 ：访问连接字符串，位于web.config文件中

string connectionstring = System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;