如何在C＃中获取存储过程输出参数

Question

I am trying to get the value of output parameter of a stored procedure in c# function. when i execute the SP i am getting correct result in sql server but i can't get in c#. Can you please tell me how can i get the output value in c#. Below is the function i am trying to get the output value in C# DAC.

public DataSet GetOrderItemPictureByOrderId(int orderID, int PageIndex)
    {
        DataSet dtOrder = new DataSet();

        /// Connect to database.
        Database db = DatabaseFactory.CreateDatabase(CONNECTION_NAME);
        using (DbCommand cmd = db.GetStoredProcCommand("uspGetOrderItemPicturePageWise"))
        {
            /// Set parameter values.
            db.AddInParameter(cmd, "@OrderID", DbType.Int32, orderID);
            db.AddInParameter(cmd, "@PageIndex", DbType.Int32, PageIndex);
            db.AddInParameter(cmd, "@PageSize", DbType.Int32, 6);
            db.AddOutParameter(cmd, "@RecordCount", DbType.Int32, 4);

            try
            {
                dtOrder = db.ExecuteDataSet(cmd);
                string outputValue = cmd.Parameters["@RecordCount"].Value.ToString(); // here i want to get the output value and want to return the value to main code 
            }
            catch (Exception ex)
            {
                LogErrors.WriteError(ex);
            }
        }
        return dtOrder;
    }
}

Here i am calling the function :-

 DataSet _ds = _orderPicDAC.GetOrderItemPictureByOrderId(OrderID, PageIndex);  

My Store Procedure :--

 CREATE PROCEDURE [dbo].[uspGetOrderItemPicturePageWise]    
      @OrderID int,    
      @PageIndex INT = 1    
      ,@PageSize INT = 10    
      ,@RecordCount INT OUTPUT    
AS    
BEGIN    
      SET NOCOUNT ON;    
      SELECT ROW_NUMBER() OVER    
      (    
            ORDER BY [PictureId] ASC    
      )AS RowNumber,    
      Orderid,    
      GenericFieldID,    
      ItemImage    
     INTO #Results    
      FROM [OrderPictures]    
      WHERE OrderID = @OrderID  
      SELECT @RecordCount = COUNT(*)    
      FROM #Results    

      SELECT * FROM #Results    
      WHERE RowNumber BETWEEN(@PageIndex -1) * @PageSize + 1 AND(((@PageIndex -1) * @PageSize + 1) + @PageSize) - 1    

      DROP TABLE #Results    
END

Thanks for your help in advance.

Answer 1

If you want to get value of output parameter outside the method without changing the return type of the method, you may use out parameters in C#.

Change your method definition like below:

public DataSet GetOrderItemPictureByOrderId(int orderID, int PageIndex, out string outputValue)
{
    //code here
    outputValue = db.GetParameterValue(cmd, "@RecordCount");
    //code here

}

and then call this method

 string outvalue;
 DataSet _ds = _orderPicDAC.GetOrderItemPictureByOrderId(OrderID, PageIndex,out outvalue;);  

You will have the value in outvalue variable.

Answer 2

You can try with below

using (SqlConnection con = new SqlConnection(dc.Con))
{
using (SqlCommand cmd = new SqlCommand("SP_ADD", con))
{
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@OrderID", DbType.Int32, orderID);
    con.Open();
    cmd.ExecuteNonQuery();
}            
}