Converting Comparison<T> to IComparer<T>

Today, I was working with IComparers (mostly for my Demystifying IComparers blog post). I realized that there's a lot of use for IComparers when working with C# and Linq. I decided that I should dedicate an entire IComparer section to C# Icomparers.

I was working on fodder for several articles when I came across a little annoyance. There's not a Comparer class that takes a Comparison delegate as a constructor argument. Thus, I can call List.Sort() and pass a Comparison delegate or a lambda expression but I cannot create an IComparer that executes that delegate or lambda.

Dissatisfied with this state of affairs, I throw together this little class:

view plainprint?

1. public class ComparisonComparer<T> : IComparer<T>  
2. {  
3.     private readonly Comparison<T> _comparison;  
4.   
5.     public ComparisonComparer(Comparison<T> comparison)  
6.     {  
7.         _comparison = comparison;  
8.     }  
9.   
10.     public int Compare(T x, T y)  
11.     {  
12.         return _comparison(x, y);  
13.     }  
14. }  

public class ComparisonComparer<T> : IComparer<T>
{
    private readonly Comparison<T> _comparison;

    public ComparisonComparer(Comparison<T> comparison)
    {
        _comparison = comparison;
    }

    public int Compare(T x, T y)
    {
        return _comparison(x, y);
    }
}