如何使用linq和C＃获取存储过程的返回值？

Question

have a stored Procedure that do some operation and return 1 or 0 as below.

CREATE PROCEDURE dbo.UserCheckUsername11
(
    @Username nvarchar(50)
)
AS
BEGIN
SET NOCOUNT ON;

IF Exists(SELECT UserID FROM User WHERE username =@Username) 
    return 1
ELSE
    return 0
END

Using linq I tried to get return value. But i am getting the output as -1 always.

Below is my Linq code :

 using (PlanGenEntities3 entity2 = new PlanGenEntities3())
 {                
    var result = entity2.Entity_test_GetHoliday();
    string output = result.ToString();
 }

How to solve this ?

Answer 1

Just declare your scalar variable as a output parameter for SQL query, then in the code you could retrieve its value this way: ```

using (PlanGenEntities3 myContext = new PlanGenEntities3())            
{                
   var outputParameter = new System.Data.Objects.ObjectParameter("OutputParameterName", typeof(int));                
   myContext.Entity_test_GetHoliday(outputParameter );                
   Console.WriteLine(outputParameter.Value);            
}

```

I suppose there is way to access the default scalar output of your SP in the similar manor.

Answer 2

If he had it as an output parameter it would automatically show as a reference parameter of the proper corresponding data type in the LINQ call.

He wouldn't really need to create a parameter object to contain that.