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