How to Call a T-SQL User-Defined Function from C#?

Summoning SQL Defined Functions from C

Calling SQL Defined Functions (UDFs) from C# can seem like a labyrinthine pursuit, but with the proper incantations, you can establish communion between your C# code and the database's arcane workings.

Your TSQL scalar function, TCupom, stands ready to unveil the total values associated with a given order, but to invoke its powers from C#, you'll need to adjust your approach.

The Summoning Spell

The initial code snippet attempts to invoke the UDF using a stored procedure syntax, but UDFs demand a different approach: inline SQL. Modify your command initialization as follows:

SqlCommand Totalf = new SqlCommand("SELECT dbo.Tcupom(@code)", conex1);

This query summons the Tcupom function explicitly and provides its parameter, @code.

The Final Invocation

With the spell complete, your revised code should resemble this:

public void TotalCupom(int cupom)
{ 
    float SAIDA;           
    SqlDataAdapter da2 = new SqlDataAdapter();
    if (conex1.State == ConnectionState.Closed)
    {
        conex1.Open();
    }
    SqlCommand Totalf = new SqlCommand("SELECT dbo.Tcupom(@code)", conex1);
    SqlParameter code1 = new SqlParameter("@code", SqlDbType.Int);
    code1.Value = cupom;
    SAIDA = Totalf.ExecuteScalar();

    return SAIDA;
}

Now, your C# code channels the power of your TSQL UDF, allowing you to uncover the hidden depths of order totals.

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