ComparerLibrary.cs

using System;
using System.Collections.Generic;

public static class ComparerLibrary
{
    public static readonly IntComparer intEqComparer = new IntComparer();
    public static readonly StringComparer stringEqComparer = new StringComparer();
    public static readonly DuplicateFloatKeyComparer dupKeyFloatComparer = new DuplicateFloatKeyComparer();

    [Serializable]
    public class DuplicateFloatKeyComparer : IComparer<float>
    {
        public int Compare(float f1, float f2)
        {
            int num = f1.CompareTo(f2);
            return num == 0 ? 1 : num;
        }
    }

    [Serializable]
    public class IntComparer : IEqualityComparer<int>
    {
        public bool Equals(int i1, int i2) => i1.Equals(i2);

        public int GetHashCode(int i) => i.GetHashCode();
    }

    [Serializable]
    public class StringComparer : IEqualityComparer<string>
    {
        public bool Equals(string s1, string s2) => s1.Equals(s2);

        public int GetHashCode(string s) => s.GetHashCode();
    }
}