#542 – Conventions for Naming Type Parameters

You can name type parameters in generic classes and generic methods anything you like.  But you should typically follow the following naming conventions for naming type parameters:

  • Use a short descriptive name
  • Use “T” as the first letter of the type parameter
  • Use “T” alone as the type parameter if it is the only parameter and if a longer name would not make its use more clear

Here are a couple examples from the .NET Framework source code:

    class ReadOnlyDictionary<TKey, TValue> : IDictionary<TKey, TValue>
        IDictionary<TKey, TValue> dictionary;

        public ReadOnlyDictionary(IDictionary<TKey, TValue> dictionary)
            : this(dictionary, true)


        public static ReadOnlyCollection<T> AsReadOnly<T>(T[] array) {