Question

我有一个连接到sqlexpress的c＃.net 4.0应用程序。我想进行更改，以便连接到localDB。我将重用相同的mdf。

目前，配置文件包含以下条目

 <configuration>
 <configSections>
 <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />

 </configSections>
 <startup>
  <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />
 </startup>

   <entityFramework>
     <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
     <parameters>
      <parameter value="Data Source=.\EMSERVER; Integrated Security=True; MultipleActiveResultSets=True" />
     </parameters>
    </defaultConnectionFactory>
   <providers>
       <provider invariantName="System.Data.SqlClient"   type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
  </providers>
 </entityFramework>

还在代码中

string providerName =＆＃34; System.Data.SqlClient＆＃34 ;;

        // Initialize the connection string builder for the
        // underlying provider.
        SqlConnectionStringBuilder sqlBuilder =
        new SqlConnectionStringBuilder();

        // Set the properties for the data source.
        sqlBuilder.DataSource = serverName;
        sqlBuilder.InitialCatalog = databaseName;
        sqlBuilder.IntegratedSecurity = true;
        sqlBuilder.Enlist = true;
        sqlBuilder.MultipleActiveResultSets = true;

        // Build the SqlConnection connection string.
        string providerString = sqlBuilder.ToString();

        // Initialize the EntityConnectionStringBuilder.
        EntityConnectionStringBuilder entityBuilder =
        new EntityConnectionStringBuilder();

        //Set the provider name.
        entityBuilder.Provider = providerName;

        // Set the provider-specific connection string.
        entityBuilder.ProviderConnectionString = providerString;

        // Set the Metadata location.
        entityBuilder.Metadata = @"res://*/TrendDataModel.csdl|
        res://*/TrendDataModel.ssdl|
        res://*/TrendDataModel.msl";

        return entityBuilder.ToString();

我们应该同时拥有代码和app.config吗？如何更改它以连接到c：\ temp中的test.mdf文件。或者我是否足以直接在代码中更改连接字符串？

Answer 1

EF提供了两种类型的DbContext / ObjectContext构造函数方法。

其中一个采用连接字符串的名称（来自配置文件），另一个采用EntityConnection实例，它是ConnectionString的包装器。这样你就可以使用其中一种。

http://msdn.microsoft.com/en-us/data/dn456849

为Entityframework设置localDB

1 个答案: