What do nested generics mean in c #?

Question

A bit of a fundamental question, but nonetheless that seems to stun me.

Given the "nested generic":

IEnumerable<KeyValuePair<TKey, TValue>>

Is this a statement that IEnumerable can have common types that themselves are KeyValuePair?

Thank,

Scott

Answer 1

Yes. The KeyValuePair type expects two typical types. We can either fill them out by pointing to specific types:

IEnumerable<KeyValuePair<string, int>>

Or we can populate them using other common parameters already specified by the external class:

class Dictionary<TKey, TValue> : IEnumerable<KeyValuePair<TKey, TValue>>

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Answer 2

, "IEnumerable /". :

IEnumberable<KeyValuePair<string, string>> reallyComplicatedDictionary =
    new IEnumerable<KeyValuePair<string, string>>();

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Answer 3

, IEnumerable, KeyValuePair<TKey, TValue> ( TKey TValue).

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Answer 4

IEnumerable<KeyValuePair<string, int>>

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