Dictionary and KeyValuePair关系

简单一句话： Dictionary 是由 KeyValuePair结构组成的集合

The Dictionary<TKey, TValue>.Enumerator.Current property
returns an instance of this type.

The foreach statement of the C# language (for each in C++, For Each in Visual Basic) requires the type of
the elements in the collection. Since each element of a collection based on IDictionary<TKey,
TValue> is a key/value pair, the element type is not the type of the key or the type of the value. Instead, the element type is KeyValuePair<TKey,
TValue>. For example:

C++

foreach( KeyValuePair<string, string> kvp in myDictionary )

{

    Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);

}

The foreach statement is a wrapper around the enumerator, which allows only reading from, not writing to, the collection.

巴特西

Dictionary and KeyValuePair关系

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