EF中执行存储过程，获取output返回值

EF不能直接支持执行存储过程，于是使用转化成执行SQL语句的形式，却怎么也获取不到output的值，折腾的好久，终于解决了，分享下曲折的经历：

        public int AddVote(int titleId, int blockId, int typeId)

        {

            List<SqlParameter> paramArray = new List<SqlParameter>();

            paramArray.Add(new SqlParameter("@titleId", titleId));

            paramArray.Add(new SqlParameter("@blockId", blockId));

            paramArray.Add(new SqlParameter("@typeId", typeId));

            SqlParameter param = new SqlParameter("@num", SqlDbType.Int);

            param.Direction = ParameterDirection.Output;

            paramArray.Add(param);

                        

            using (RPDBContext db = new RPDBContext())

            {

                try

                {

                    db.Database.ExecuteSqlCommand("EXEC [AddVote] @blockId,@titleId,@typeId,@num out", paramArray.ToArray());

                }

                catch (Exception ex)

                {

                    throw;

                }

                int result = (int)paramArray[3].Value;

                return result;

            }

        }

存储过程测试实例：

USE [HY_ReplyComment]

GO

/****** 对象:  StoredProcedure [dbo].[AddVote]    脚本日期: 06/10/2014 22:27:11 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO



-- =============================================

-- Author:        <Author,,Name>

-- Create date: <Create Date,,>

-- Description:    <Description,,>

-- =============================================

CREATE PROCEDURE [dbo].[AddVote] 

    @blockId int,

    @titleId int,

    @typeId int,

    @num int output

AS

BEGIN

    -- SET NOCOUNT ON added to prevent extra result sets from

    -- interfering with SELECT statements.

    SET NOCOUNT ON;



    SELECT @num = Count(1) FROM [Vote] WHERE TitleId = @titleId AND BlockId = @blockId



END

其实很简单了，这样就可以获取到返回值@num为output的值了，首先是写成了如下的形式，一直获取的是null值，一直报错：

db.Database.ExecuteSqlCommand("EXEC [AddVote] @blockId,@titleId,@typeId,@num", paramArray.ToArray());
记得"EXEC [AddVote] @blockId,@titleId,@typeId,@num" 标明@num为out类型参数，太不智能了⊙﹏⊙b汗


谢谢以下链接的：http://www.tuicool.com/articles/zquiYf