How does List.IndexOf() perform comparisons on custom objects?

Question

I wrote a class of account objects and hold a static List of those account objects. My program loops through each account in the list, performing some

Answer 1

You can use a custom Predicate for your class, such as:

public class Account
{
  public string name;
  public string password;
  public string newInfo;

  public class IndexOfName
  {
    private string _match = "";

    public IndexOfName()
    {
    }

    public Predicate Match(string match)
    {
      this._match = match;
      return IsMatch;
    }

    private bool IsMatch(Account matchTo)
    {
      if (matchTo == null)
      {
        return false;
      }
      return matchTo.Equals(this._match);
    }
  }
}

Then you can use it as follow:

Account.IndexOf indexOf = new Account.IndexOf();
int index;
if ((index = AccountList.FindIndex(indexOf.Match("john"))) > 0)
{
  // do something with John
}
if ((index = AccountList.FindIndex(indexOf.Match("jane"))) > 0)
{
  // do something with Jane
}

You could even change the IndeOfName class to use a flag to switch between the type of info you are looking for. Ex: name or newInfo.