Question

What is a C#’s analog of std::pair in C++? I found System.Web.UI.Pair class, but I’d prefer something template-based.

Answer 1

Tuples are available since .NET4.0 and support generics:

Tuple<string, int> t = new Tuple<string, int>('Hello', 4); 

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In previous versions you can use System.Collections.Generic.KeyValuePair<K, V> or a solution like the following:

public class Pair<T, U> {     public Pair() {     }      public Pair(T first, U second) {         this.First = first;         this.Second = second;     }      public T First { get; set; }     public U Second { get; set; } }; 

And use it like this:

Pair<String, int> pair = new Pair<String, int>('test', 2); Console.WriteLine(pair.First); Console.WriteLine(pair.Second); 

This outputs:

test 2 

Or even this chained pairs:

Pair<Pair<String, int>, bool> pair = new Pair<Pair<String, int>, bool>(); pair.First = new Pair<String, int>(); pair.First.First = 'test'; pair.First.Second = 12; pair.Second = true;  Console.WriteLine(pair.First.First); Console.WriteLine(pair.First.Second); Console.WriteLine(pair.Second); 

That outputs:

test 12 true