[EF]获取返回值

当存储过程包含输出参数时，可以进一步传入out形式的SqlParameter对象以获取输出参数，参考以下的存储过程：

CREATE PROCEDURE [dbo].[SetSPriceById]
	@P1 int = 0 ,
	@P2 int = 0 , 
	@P3 int = 0 ,
	@P4 int OUT
AS
	UPDATE Product SET SPrice = @P1 WHERE Id > @P2 AND Id < @P3
	SET @P4 = @@ROWCOUNT

//using StoredProcedureOut.Model; //using System.Data.SqlClient;

using (var context = new KTStoreContext())
            {
                string sp = "SetSPriceById @P1,@P2, @P3,@P4 OUT";
                SqlParameter[] parameters = {
                    new SqlParameter("P1", 100),
                    new SqlParameter("P2", 10),
                    new SqlParameter("P3", 15),
                     new SqlParameter("P4", System.Data.SqlDbType.Int) {
                         Direction = System.Data.ParameterDirection.Output
                     }
                };
                context.Database.ExecuteSqlCommand(sp, parameters);
                Console.WriteLine("变更数据项数：{0}",parameters[3].Value.ToString());

                Console.ReadLine();
            }