从EF4调用存储过程时返回值的问题

Question

I have written the following stored procedure in SQL Server 2008 :

ALTER Procedure [dbo].[usp_TodayNumberOfRegisteration] 
(
@TodayShamsiDate nvarchar
)
AS
Select COUNT(csci.Id) as cc1  FROM dbo.Complex_Service_Cart_Items csci INNER JOIN dbo.Complex_Service_Cart csc
ON csci.Id_Complex_Service_Cart=csc.Id
WHERE (csci.Id_Complex_Service='2cca1a67-34f4-4837-bebe-f3ba4c72b98d' or csci.Id_Complex_Service='8430cad2-dbb1-4425-bb8b-a7e158f688c4') 
and csc.TFIsPaymentComplete=1 
and csc.TFDateBackFromBankp= RTRIM( @TodayShamsiDate)

And I am calling it from C# codebehind via EF4 this way :

string shamsiDate = Date.getShamsiDate();
returnValue = Convert.ToString(db.getTodayNumberOfRegisteration(shamsiDate).First().Value);

where getTodayNumberOfRegisteration is a function I added to my edmx model .

Now here is the issue : when I execute the stored procedure in SQL Server and instead of

 and csc.TFDateBackFromBankp= RTRIM( @TodayShamsiDate)

I set something like :

 and csc.TFDateBackFromBankp= RTRIM( '1391/12/05')

This stored procedure returns a value of 6

But when I pass the parameter from C# codebehind and I get the return value '0'

Any help would be appreciated.

Answer 1

I normally do it like this: in the Add Function Import dialog, select your stored procedure and define that it returns a Collection Of Scalars: Int32 :

Then in your code, call it like this:

int value = db.getTodayNumberOfRegisteration(shamsiDate).First().Value;

This usually works just fine for me.

If you don't define it as returns a collection of: Int32 , it seems that the value you're getting back is really the return value from the stored procedure call, eg the number of rows that were affected by the stored procedure execution (0 or -1 for a SELECT , since you didn't actually insert, update or delete any rows):

Answer 2

I found the issue : I had set the parameter this way :

@TodayShamsiDate nvarchar

and I should have specified the length of nvarchar

@TodayShamsiDate nvarchar(10)

I did It and the problem is solved !