Custom Object Formatting : Custom Format « Development « C# / CSharp Tutorial

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

using System;

class Employee: IFormattable
{
    int    id;
    string    firstName;
    string    lastName;

    public Employee(int id, string firstName, string lastName)
    {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
    }
    public string ToString (string format, IFormatProvider fp) 
    {
        if ((format != null) && (format.Equals("F")))
            return(String.Format("{0}: {1}, {2}", id, lastName, firstName));
        else
            return(id.ToString(format, fp));
    }
}

class MainClass
{
    public static void Main()
    {
        Employee fred = new Employee(123, "First", "Last");
        Console.WriteLine("No format: {0}", fred);
        Console.WriteLine("Full format: {0:F}", fred);
    }
}

No format: 123
Full format: 123: Last, First