Generic Comparer

Have you ever had to write a comparer for a specific type, only to be frustrated when you needed to write a second and third comparer for other types? Fear not, a generic comparer can take care of this for you!

/// <summary>
/// Compares two objects of any type.
/// </summary>
/// <typeparam name="T">The type to be compared.</typeparam>
public class GenericComparer<T> : IComparer<T>
{
    // The compare method
    private readonly Func<T, T, int> _compareMethod = null;

    /// <summary>
    /// The constructor.
    /// </summary>
    /// <param name="compareMethod">The compare method.</param>
    public GenericComparer(Func<T, T, int> compareMethod)
    {
        // Sanitize
        if (compareMethod == null)
        {
            throw new ArgumentNullException("compareMethod");
        }

        _compareMethod = compareMethod;
    }

    /// <summary>
    /// Compares two objects.
    /// </summary>
    /// <param name="x">The first object.</param>
    /// <param name="y">The second object.</param>
    /// <returns>Less than 0 if x is less than y, greater than 
    /// 0 if x is greater than y, 0 if they are equal.</returns>
    public int Compare(T x, T y)
    {
        return _compareMethod(x, y);
    }
}

Just pass a method to the constructor that takes 2 objects of type T and returns an int, and you’re all set!

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