How do I sort an array of custom classes?

Question

I have a class with 2 strings and 1 double (amount).

class Donator

• string name
• string comment
• double amount

Now I have a A

Answer 1

By implementing IComparable and then use Array.Sort.

public class Donator : IComparable {
    public string name;
    public string comment;
    public double amount;

    public int CompareTo(object obj) {
        // throws invalid cast exception if not of type Donator
        Donator otherDonator = (Donator) obj; 

        return this.amount.CompareTo(otherDonator.amount);
    }
}

Donator[] donators;  // this is your array
Array.Sort(donators); // after this donators is sorted