Create customized format for Complex : Custom Format « Development « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Development
3. Custom Format

using System;
using System.Text;
using System.Globalization;

public struct Complex : IFormattable
{
    public Complex( double real, double imaginary ) {
        this.real = real;
        this.imaginary = imaginary;
    }

    public string ToString( string format,IFormatProvider formatProvider ) {
        StringBuilder sb = new StringBuilder();

        if( format == "DBG" ) {
            sb.Append( this.GetType().ToString() + "\n" );
            sb.AppendFormat( "\treal:\t{0}\n", real );
            sb.AppendFormat( "\timaginary:\t{0}\n", imaginary );
        } else {
            sb.Append( "( " );
            sb.Append( real.ToString(format, formatProvider) );
            sb.Append( " : " );
            sb.Append( imaginary.ToString(format, formatProvider) );
            sb.Append( " )" );
        }

        return sb.ToString();
    }

    private double real;
    private double imaginary;
}

public class MainClass
{
    static void Main() {
        CultureInfo local = CultureInfo.CurrentCulture;
        CultureInfo germany = new CultureInfo( "de-DE" );

        Complex cpx = new Complex( 12.3456, 1234.56 );

        string strCpx = cpx.ToString( "F", local );
        Console.WriteLine( strCpx );

        strCpx = cpx.ToString( "F", germany );
        Console.WriteLine( strCpx );

        Console.WriteLine( "\nDebugging output:\n{0:DBG}", cpx );
    }
}

( 12.35 : 1234.56 )
( 12,35 : 1234,56 )

Debugging output:
Complex
        real:   12.3456
        imaginary:      1234.56