Provides additional comparison mechanisms
This allows you to provide ordering of your class on several fields or properties, ascending or descending order on the same field or both.
IComparable - Provides a comparer check (for sorting) when there is only on way ot ordering the objects (implemented inside the class)
IComparer - Allows you to define and use multiple comparer checks (implemented outside the class)
When you implement the IComparer there are two steps.
First declare a class that implements IComparer
private class SortAscendingHelper : IComparer
int IComparer.Compare(object a, object b)
myobject = my1 (myObject)a;
myobject = my2 (myObject)b;
if (my1.MySortProperty > my2.MySortProperty)
if (my1.MySortProperty < my2.MySortProperty)
Second implement the Compare method.
public static IComparer sortAscending()
return (IComparer) new SortAsecendingHelper();
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