Is there an easy way to create ordinals in C#?

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This page gives you a complete listing of all custom numerical formatting rules:

Custom numeric format strings

As you can see, there is nothing in there about ordinals, so it can’t be done using String.Format. However its not really that hard to write a function to do it.

public static string AddOrdinal(int num)
{
    if( num <= 0 ) return num.ToString();

    switch(num % 100)
    {
        case 11:
        case 12:
        case 13:
            return num + "th";
    }
    
    switch(num % 10)
    {
        case 1:
            return num + "st";
        case 2:
            return num + "nd";
        case 3:
            return num + "rd";
        default:
            return num + "th";
    }
}

Update: Technically Ordinals don’t exist for <= 0, so I’ve updated the code above. Also removed the redundant ToString() methods.

Also note, this is not internationalized. I’ve no idea what ordinals look like in other languages.

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