在Entity Framework中重用现有的数据库连接字符串

public gioiashopEntities() : 
                base(BuildConnection(“SqlSessionServices”),"gioiashopEntities")
        {
            this.OnContextCreated();
        }

 
static System.Data.EntityClient.EntityConnection BuildConnection(string connectionStringName)
{
    string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings[connectionStringName].ConnectionString;
    System.Data.Metadata.Edm.MetadataWorkspace workspace = new System.Data.Metadata.Edm.MetadataWorkspace(new string[] { "res://*/" }, new System.Reflection.Assembly[] { System.Reflection.Assembly.GetExecutingAssembly() });
    System.Data.SqlClient.SqlConnection sqlConnection = new System.Data.SqlClient.SqlConnection(connectionString);
    return new System.Data.EntityClient.EntityConnection(workspace, sqlConnection);
}