C# lambda expressions and IComparer

Question

I am using lambda expressions to sort and search an array in C#. I don\'t want to implement the IComparer interface in my class, because I need to sort and search on multiple m

Answer 1

Well, one option is to create something like ProjectionComparer instead. I've got a version of that in MiscUtil - it basically creates an IComparer from a projection.

So your example would be:

int index = Array.BinarySearch(widgets, x,
                               ProjectionComparer.Create(x => x.foo));

Or you could implement your own extension methods on T[] to do the same sort of thing:

public static int BinarySearchBy(
    this TSource[] array,
    TSource value,
    Func keySelector)
{
    return Array.BinarySearch(array, value,
                              ProjectionComparer.Create(array, keySelector));
}