using System; using System.Collections; using System.Reflection; namespace NUnit.Framework.Constraints { public sealed class NUnitComparer : IComparer { public static NUnitComparer Default => new NUnitComparer(); public int Compare(object x, object y) { if (x == null) { if (y != null) return -1; return 0; } if (y == null) return 1; if (Numerics.IsNumericType(x) && Numerics.IsNumericType(y)) return Numerics.Compare(x, y); if (x is IComparable) return ((IComparable)x).CompareTo(y); if (y is IComparable) return -((IComparable)y).CompareTo(x); Type type = x.GetType(); Type type2 = y.GetType(); MethodInfo method = type.GetMethod("CompareTo", new Type[1] { type2 }); if (method != (MethodInfo)null) return (int)method.Invoke(x, new object[1] { y }); method = type2.GetMethod("CompareTo", new Type[1] { type }); if (method != (MethodInfo)null) return -(int)method.Invoke(y, new object[1] { x }); throw new ArgumentException("Neither value implements IComparable or IComparable<T>"); } } }