Advantages/Disadvantages of different implementations for Comparing Objects

Question

This questions involves 2 different implementations of essentially the same code.

First, using delegate to create a Comparison method that can be used as a parameter whe

Answer 1

In your case, advantage of having an IComparer over Comparision delegate, is that you can also use it for the Sort method, so you don't need a Comparison delegate version at all.

Another useful thing you can do is implementing a delegated IComparer implementation like this:

public class DelegatedComparer : IComparer
{
  Func _comparision;
  public DelegatedComparer(Func comparision)
  {
    _comparision = comparision;
  }
  public int Compare(T a,T b) { return _comparision(a,b); }
}

list.Sort(new DelegatedComparer((foo1,foo2)=>foo1.Bar.CompareTo(foo2.Bar));

and a more advanced version:

public class PropertyDelegatorComparer : DelegatedComparer
{
  PropertyDelegatorComparer(Func projection)
    : base((a,b)=>projection(a).CompareTo(projection(b)))
}