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  1. using System;
  2. using System.Globalization;
  3. using System.Collections.Generic;
  4.  
  5. public class Test
  6. {
  7.        public abstract class Parent : IComparable<Parent> {
  8.     public string Title;
  9.     public Parent(string title){this.Title = title;}
  10.  
  11.     public int CompareTo(Parent other){
  12.         return this.Title.CompareTo(other.Title);
  13.     }
  14. }
  15.  
  16. public class Child : Parent {
  17.     public Child() : base("") { }
  18.     public Child(string title):base(title){}
  19. }
  20.  
  21.  
  22. 	public static void Main()
  23. 	{
  24.        List<Child> children = new List<Child>();
  25.         children.Add(new Child() { Title = "ABC" });
  26.         children.Add(new Child() { Title = "BAB" });
  27.         children.Add(new Child() { Title = "ADE" });
  28.         children.Sort(); //Fails with "Failed to compare two elements in the array."
  29.       foreach(var c in children)
  30.             Console.WriteLine(c.Title);
  31. 	}
  32. }
Runtime error #stdin #stdout 0.03s 36400KB
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Standard input is empty
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Standard output is empty
https://ideone.com/rZ0rVL
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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