inbuilt Data Structure in C#, which can hold pair like Key, Value, Value

Question

I am looking for a inbuilt Data Structure in C#, which can hold pair like Key, Value, Value.

For Example for Dictionary in C# we have Key and Value. Similarly I am Looking a inbuilt data structure, which holds Key, Value, Value. It should be generic.

Answer 1

How about Tuple<T1, T2, T3> ?

It even supports up to 8 values.

Answer 2

Dictionary<T1, Tuple<T2, T3>> works, as @Mant101 said in the comments. or Dictionary<T1, KeyValuePair<T2, T3>> if there is also a key-value relationship between T2 and T3