icomparer - w3toppers.com

Implementing custom IComparer with string

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” … Read more

difference between IComparable and IComparer [duplicate]

As the name suggests, IComparable<T> reads out I’m comparable. IComparable<T> when defined for T lets you compare the current instance with another instance of same type. IComparer<T> reads out I’m a comparer, I compare. IComparer<T> is used to compare any two instances of T, typically outside the scope of the instances of T. As to … Read more

When to use IComparable Vs. IComparer

Well they are not quite the same thing as IComparer<T> is implemented on a type that is capable of comparing two different objects while IComparable<T> is implemented on types that are able to compare themselves with other instances of the same type. I tend to use IComparable<T> for times when I need to know how … Read more

Using IComparer for sorting

You need to implement the strongly type interface (MSDN). public class CoordinatesBasedComparer : IComparer<Point> { public int Compare(Point a, Point b) { if ((a.x == b.x) && (a.y == b.y)) return 0; if ((a.x < b.x) || ((a.x == b.x) && (a.y < b.y))) return -1; return 1; } } BTW, I think you use … Read more

Use own IComparer with Linq OrderBy

Your comparer looks wrong to me. You’re still just sorting in the default text ordering. Surely you want to be parsing the two numbers and sorting based on that: public int Compare(Object stringA, Object stringB) { string[] valueA = stringA.ToString().Split(“https://stackoverflow.com/”); string[] valueB = stringB.ToString().Split(“https://stackoverflow.com/”); if (valueA.Length != 2 || valueB.Length != 2) { stringA.ToString().CompareTo(stringB.ToString()); } … Read more