C#: Getting maximum and minimum values of arbitrary properties of all items in a list

Question

I have a specialized list that holds items of type IThing:

public class ThingList : IList
{...}

public interface IThing
{
    Decimal         


        

Answer 1

How about a generalised .Net 2 solution?

public delegate A AggregateAction( A prevResult, B currentElement );

public static Tagg Aggregate( 
    IEnumerable source, Tagg seed, AggregateAction func )
{
    Tagg result = seed;

    foreach ( Tcoll element in source ) 
        result = func( result, element );

    return result;
}

//this makes max easy
public static int Max( IEnumerable source )
{
    return Aggregate( source, 0, 
        delegate( int prev, int curr ) { return curr > prev ? curr : prev; } );
}

//but you could also do sum
public static int Sum( IEnumerable source )
{
    return Aggregate( source, 0, 
        delegate( int prev, int curr ) { return curr + prev; } );
}