存储过程代码错误

Question

I have this C# code calling a stored procedure:

using (SqlConnection myConnection = new SqlConnection(Utility.ConnString))
{
    myConnection.Open();

    using (SqlCommand myCommand = new SqlCommand(AddScanLocation_Proc, myConnection))
    {
        myCommand.Parameters.AddWithValue("@LocationQr", string.IsNullOrEmpty(LocationQr) ? "" : LocationQr);
        myCommand.Parameters.AddWithValue("@LocationNfc", string.IsNullOrEmpty(LocationNfc) ? "" : LocationNfc);
        myCommand.Parameters.AddWithValue("@LocationMachineName", LocationMachineName);
        myCommand.Parameters.AddWithValue("@LocationName", LocationName);
        myCommand.Parameters.AddWithValue("@IsLastStop", IsLastStop);
        myCommand.Parameters.AddWithValue("@Active", Active);

        IAsyncResult res = myCommand.BeginExecuteNonQuery();

        while (!res.IsCompleted) { }

        int response = myCommand.EndExecuteNonQuery(res);

        if (response > 0)
            toReturn = true;
   }
}

Every time I execute the code, I get an error telling me

Procedure or function 'AddScanLocation' expects parameter '@LocationMachineName', which was not supplied.

I have debugged the code for hours and everything is typed correctly, and the variable is not null or empty, but it keeps throwing an error

any advice would be greatly appreciated!

Answer 1

Try check first if all your variables (including LocalMachineName ) has values before call block code for execute your stored procedure.

Checking you code, you posted:

myCommand.Parameters.AddWithValue("@LocationQr", string.IsNullOrEmpty(LocationQr) ? "" : LocationQr);

Why not do the same with LocalMachineName too?

PS: Try use test values if the variable LocalMachineName doesn't allow null values.

Answer 2

Plain and simply: you haven't told ADO.NET that you're executing a stored procedure !

Add this line:

using (SqlCommand myCommand = new SqlCommand(AddScanLocation_Proc, myConnection))
{
    myCommand.CommandType = CommandType.StoredProcedure;

    ...... 

and then everything should work just fine.