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BOOK: Beginning Visual C# 2010
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Old May 4th, 2012, 09:24 AM
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Default Chapter 11 Sorting Question

In chapter 11, there is a Try It Out section about using Sorting with IComparable.

Below is the line that called the sorting method
Console.WriteLine("People sorted with default comparer (by age):");
When I debugged it, that line goes to CompareTo method just like the book explained, but I don't understand how the CompareTo method ended up sorting the ArrayList. I just do not see how this happens even after I debug the code. Can anyone explain why the code below works to sort the ArrayList? I do not see that the code change the position of the items in the ArrayList.

public int CompareTo(object obj)
      if (obj is Person)
        Person otherPerson = obj as Person;
        return this.Age - otherPerson.Age;
        throw new ArgumentException("Object to compare to is not a Person object.");

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