Implementing custom IComparer with string

by

This should do what you want:

var example = new string[]{"c", "a", "d", "b"};
var comparer = new CustomStringComparer(StringComparer.CurrentCulture);
Array.Sort(example, comparer);

...

class CustomStringComparer : IComparer<string>
{
    private readonly IComparer<string> _baseComparer;
    public CustomStringComparer(IComparer<string> baseComparer)
    {
        _baseComparer = baseComparer;
    }

    public int Compare(string x, string y)
    {
        if (_baseComparer.Compare(x, y) == 0)
            return 0;

        // "b" comes before everything else
        if (_baseComparer.Compare(x, "b") == 0)
            return -1;
        if (_baseComparer.Compare(y, "b") == 0)
            return 1;

        // "c" comes next
        if (_baseComparer.Compare(x, "c") == 0)
            return -1;
        if (_baseComparer.Compare(y, "c") == 0)
            return 1;

        return _baseComparer.Compare(x, y);
    }
}

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