Reading a return value from store procedure

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I am trying to read the result from a store procedure.
This is the Store Procedure:

ALTER PROCEDURE [dbo].[VALIDAR_CLIENTE_FACTURA]  
@CTE_NUMERO AS VARCHAR(12) OUTPUT
AS  
BEGIN  
 DECLARE @FECHAINICIO DATE  
 DECLARE @FECHAFIN DATE  
  
 SET @FECHAFIN = '2018-01-19'  
 SET @FECHAINICIO = '2016-01-19'  

 SET  @CTE_NUMERO=(
 SELECT   
  CASE WHEN   
   COUNT(*)>=1  
   THEN 'FACTURA VALIDA'   
   ELSE 'FACTURA NO VALIDA' END Resultado  
  FROM CLIENTES AS C   
 INNER JOIN FACTURAS AS F  
 ON F.CTE_NUMERO_EPS=C.CTE_NUMERO_EPS   
 WHERE REPLACE(C.CTE_NUMERO_EPS,'-','') = REPLACE(@CTE_NUMERO,'-','')  
 AND CAST(C.CTE_FECHA_INGRESO  AS DATE) BETWEEN @FECHAINICIO AND @FECHAFIN   
 AND CAST(F.FAC_FECHA  AS DATE) BETWEEN @FECHAINICIO AND @FECHAFIN)   
 
 RETURN @CTE_NUMERO

Here is my code in c#

[HttpGet("{numero}")]
       public async Task<ActionResult<string>> Get(string numero)
       {
           var Result="";
           var output = new SqlParameter();
           output.ParameterName = "@Salida";
           output.SqlDbType = System.Data.SqlDbType.Char;
           output.Direction = System.Data.ParameterDirection.Output;

           Result = await _contextInvoice.Database.ExecuteSqlRawAsync
               ("EXEC validar_cliente_factura @CTE_NUMERO={0},@Salida={1}", numero,output);

           return Result;
       }

But i can not, this line:

Result = await _contextInvoice.Database.ExecuteSqlRawAsync
               ("EXEC validar_cliente_factura @CTE_NUMERO={0},@Salida={1}", numero,output);

says: can not convert int to string, where is the error

What I have tried:

I had read examples, i had tried without the output parameter and return and int.

Posted 4-Aug-22 6:56am

Luis M. Rojas

Updated 5-Aug-22 3:08am

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Comments

PIEBALDconsult 4-Aug-22 19:12pm

If the Procedure has only one parameter, why provide it two?
And why try to pass values in?
"EXEC validar_cliente_factura @CTE_NUMERO={0},@Salida={1}"

2 solutions

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Gerry Schmitz · Answer 1 · 2022-08-04T08:16:00

Solution 1

You initialized Result as a string (var Result = ""); at the very least, it should be var Result = 0; (to create an int).

var Result = await ... etc. would have worked also.

But it begs the whole point: why use var when you know it is an int and just get confused otherwise.

And then there's (Task<actionresult<int>>), or did you want to convert an actual int to a string?

Posted 4-Aug-22 8:16am

Gerry Schmitz

Updated 4-Aug-22 8:18am

v2

Comments

Luis M. Rojas 4-Aug-22 14:20pm

Hello,
The result(the store procedure) has return a string: FACTURA VALIDA or FACTURA INVALIDA

Luis M. Rojas · Answer 2 · 2022-08-05T03:08:00

Again, thanks to all of you.
The solution was in front of my eyes:

var r = await _contextInvoice.Database.ExecuteSqlRawAsync
               ("EXEC validar_cliente_factura CTE_NUMERO,@RESPUESTA OUTPUT", numero,output);
)

The value i wanted was here: output. Just have to ask for it in this way
(string)output.Value