EF 怎么调用存储过程并获得output参数

1、MVC4的项目，自动会把存储过程在项目中映射为函数。

2、存储过程：

　　

ALTER PROCEDURE [dbo].[P_FindAnZhiRen]
     @tempP_ID int output  
    ,@Member_ID int
    ,@Is_Right bit 
AS


set @tempP_ID =@Member_ID 
BEGIN


if @Is_Right =0
begin
    While(Exists(select 1 from tbMemberInfo where Parent_ID=@tempP_ID and Is_Right=0))
    begin
        select @tempP_ID=Member_ID from tbMemberInfo where Parent_ID=@tempP_ID and Is_Right=0
    end     
end 


if @Is_Right =1
begin
    if(Exists(select 1 from tbMemberInfo where Parent_ID=@tempP_ID and Is_Right=1))
    begin
        select @tempP_ID=Member_ID from tbMemberInfo where Parent_ID=@tempP_ID and Is_Right=1
    end
    
    While(Exists(select 1 from tbMemberInfo where Parent_ID=@tempP_ID and Is_Right=0))
    begin
        select @tempP_ID=Member_ID from tbMemberInfo where Parent_ID=@tempP_ID and Is_Right=0
    end     
end 

END

项目代码：

　　

            var tempP_ID = new ObjectParameter("tempP_ID", typeof(Int32));
            var result = db.P_FindAnZhiRen(tempP_ID, 1, false );
            var result1 = tempP_ID.Value;

result1就是output的值