How can I create an alias for a generic class in C#?

Question

How can I do the following in C#? What is the right way to write the first line of this code snippet?

using KVP<K, V> = System.Collections.Generic.KeyValuePair<K, V>;

class C { KVP<int, string> x; }

as Eric Lippert stated [here](http://stackoverflow.com/q/3720222/303290) "This is an occasionally requested feature." which hasn't made it into production yet. — mbx, Jul 04 '13 at 13:35

Marc Gravell · Accepted Answer · 2009-01-11T20:58:54.053

40

You can't, basically. You can only use fixed aliases, such as:

using Foo = System.Collections.Generic.KeyValuePair<int, string>;

class C { Foo x; }

edited Jan 11 '09 at 20:58

answered Jan 11 '09 at 20:53

Marc Gravell

score 1 · Answer 2 · answered Jan 31 '16 at 10:22

In some cases you can go with inheritance:

public class MyList<T1, T2> : List<Tuple<IEnumerable<HashSet<T1>>, IComparable<T2>>> { }

public void Meth()
{
    var x = new MyList<int, bool>();
}

Though not in your particular case, as KeyValuePair is sealed :-(

2 Answers2