MVC4将带有linq的存储过程输出返回到sql

Question

I have a similar issue with thread below ASP.NET MVC4 return output from a stored procedure with Entity Framework

I have tried same thing but I am getting the error:

Cannot assign void to an implicitly-typed local variable on

Here is my procedure:

create PROCEDURE [dbo].[usp_UpdateValuesInTables]  
(  
    @s_clientid int,
    @success int output
)  
AS  
BEGIN  
    Begin Try
        BEGIN TRAN  
            ---- sql statements
        COMMIT TRAN 
        set @success=1 
    End Try
    Begin Catch
        ROLLBACK TRAN  
        set @success=0  
    End Catch
END 

and c# code

int? success = null;
var successCode = Context.usp_UpdateValuesInTables(Convert.ToInt32(obj.SourceClientDropDown),ref success);

Why am I getting that error?

If I try to replace var with int then I am getting error

Can not implicitly convert type void to int

Answer 1

try this:

int? success = null;
Context.usp_UpdateValuesInTables(Convert.ToInt32(obj.SourceClientDropDown),ref success);
var successCode = success; //success is the returned result.

Answer 2

Your issue is that the Stored Procedure doesn't actually return a value, but Entity Framework isn't aware of the Void return. you need to make sure you use SET NOCOUNT ON in the stored procedure so that Entity Framework can determine the Void return and map a default value in.