C# 在app.config中创建连接字符串attachdbfilename的相对路径

这是我的EF entities连接字符串，目前

AttachDbFile

字符串是数据库的完整路径，在我部署站点时无法工作。如何为我的

AttachDbFile

创建相对路径

<add name="demoDBEntities" connectionString="metadata=res://*/SalongModel.csdl|res://*/SalongModel.ssdl|res://*/SalongModel.msl;provider=System.Data.SqlClient;provider connection string='data source=(LocalDB)\v11.0;attachdbfilename=&quot;C:\Users\user\Documents\Visual Studio 2013\Projects\WebApplication3\SVCloginLib\App_Data\demoDB.mdf&quot;;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient" />

我试过最明显的方法：

<add name="demoDBEntities" connectionString="metadata=res://*/SalongModel.csdl|res://*/SalongModel.ssdl|res://*/SalongModel.msl;provider=System.Data.SqlClient;provider connection string='data source=(LocalDB)\v11.0;attachdbfilename=|DataDirectory|demoDB.mdf;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient" />

<add name="demoDBEntities" connectionString="metadata=res://*/SalongModel.csdl|res://*/SalongModel.ssdl|res://*/SalongModel.msl;provider=System.Data.SqlClient;provider connection string='data source=(LocalDB)\v11.0;attachdbfilename=&quot;.\App_Data\demoDB.mdf&quot;;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient" />

<add name="demoDBEntities" connectionString="metadata=res://*/SalongModel.csdl|res://*/SalongModel.ssdl|res://*/SalongModel.msl;provider=System.Data.SqlClient;provider connection string='data source=(LocalDB)\v11.0;attachdbfilename=&quot;~\App_Data\demoDB.mdf&quot;;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient" /> 

还有更多，都给我：

基础提供程序在打开时失败

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它用于c#Rest服务，如果有任何不同

您可以使用

|DataDirectory |

值指定项目中的

App#u Data

文件夹。但是，您确实需要用斜线分隔该值：

<add name="demoDBEntities" connectionString="metadata=res://*/SalongModel.csdl|res://*/SalongModel.ssdl|res://*/SalongModel.msl;provider=System.Data.SqlClient;provider connection string='data source=(LocalDB)\v11.0;attachdbfilename=|DataDirectory|\demoDB.mdf;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient" />

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它适用于c#Rest服务，如果它有任何不同，请将该代码添加到您的

应用程序_Start

例程中。我刚刚收到大量错误。我的项目文件夹中没有global.asax.cs。您可以添加

global.asax

文件，并将该行代码复制到正确的例程中。但是，您必须复制错误才能获得这些错误。

<add name="demoDBEntities" connectionString="metadata=res://*/SalongModel.csdl|res://*/SalongModel.ssdl|res://*/SalongModel.msl;provider=System.Data.SqlClient;provider connection string='data source=(LocalDB)\v11.0;attachdbfilename=|DataDirectory|\demoDB.mdf;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework'" providerName="System.Data.EntityClient" />

AppDomain.CurrentDomain.SetData("DataDirectory",
    Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData));