edmx的构造函数:

public DecorationMSEntities() : base(myConfig.DataBaseConnectionString, "DecorationMSEntities")

        {

            this.ContextOptions.LazyLoadingEnabled = true;

            OnContextCreated();

        }

EF连接字符串模板类: 

 public class myConfig

    {

     public static string DataBaseConnectionString

       {

               return

                   EFConnectionStringModle("EFname", @"(local)\instance",

                   "yourDbName","sa","yourpassword"); }

       }

       private static string EFConnectionStringModle(string EntityName,string DBsoure,string DBname, string ID, string Password)

       {

           return string.Concat("metadata=res://*/",

               EntityName, ".csdl|res://*/",

               EntityName, ".ssdl|res://*/",

               EntityName, ".msl;provider=System.Data.SqlClient;provider connection string='Data Source=",

               DBsoure, ";Initial Catalog=",

               DBname,";Persist Security Info=True;User ID=",

               ID, ";Password=",

               Password, ";MultipleActiveResultSets=True'");

          

       }