Topic: Why List<T>.Contains() and List<T>.Exists() both failed?

[gile]

Anyhow, I am very aware that I can never change a List when iterating it, not for loop or foreach loop. Haha.

You can't with foreach (a foreach iteration variable cannot be assigned), but you can with for.

Code - C#: [Select]

1.         static void Main()
2.         {
3.             List<int> lst = new List<int>(4) { 0, 1, 2, 3 };
4.             Print(lst);
5.             for (int i = 0; i < lst.Count; i++)
6.             {
7.                 lst[i] += 10;
8.             }
9.             Print(lst);
10.             Console.ReadKey();
11.         }
12.  
13.         static void Print<T>(IEnumerable<T> collection)
14.         {
15.             foreach (T item in collection)
16.             {
17.                 Console.WriteLine(item);
18.             }
19.         }

[waterharbin]

Hi,gile.Thanks for that. I feel like I was an export on computer science already.Haha. You people do teach me a lot.