DbMigration 外键删除修改

 public partial class _20151112 : DbMigration
    {
        public override void Up()
        {
            DropForeignKey("dbo.T_RoleProductModule", "Product_Id", "dbo.T_Product");
            DropIndex("dbo.T_RoleProductModule", new[] { "Product_Id" });
            AddColumn("dbo.T_RoleProductModule", "RoleProduct_Id", c => c.Int());
            CreateIndex("dbo.T_RoleProductModule", "RoleProduct_Id");
            AddForeignKey("dbo.T_RoleProductModule", "RoleProduct_Id", "dbo.T_RoleProduct", "Id");
            DropColumn("dbo.T_RoleProductModule", "Product_Id");
        }

        public override void Down()
        {
            AddColumn("dbo.T_RoleProductModule", "Product_Id", c => c.Int());
            DropForeignKey("dbo.T_RoleProductModule", "RoleProduct_Id", "dbo.T_RoleProduct");
            DropIndex("dbo.T_RoleProductModule", new[] { "RoleProduct_Id" });
            DropColumn("dbo.T_RoleProductModule", "RoleProduct_Id");
            CreateIndex("dbo.T_RoleProductModule", "Product_Id");
            AddForeignKey("dbo.T_RoleProductModule", "Product_Id", "dbo.T_Product", "Id");
        }
    }