MVC自学知识点

KeyValuePair<TKey, TValue> 是个结构

public interface IDictionary<TKey, TValue> : ICollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, IEnumerable
{
    // Methods
    void Add(TKey key, TValue value);
    bool ContainsKey(TKey key);
    bool Remove(TKey key);
    bool TryGetValue(TKey key, out TValue value);

    // Properties
    TValue this[TKey key] { get; set; }
    ICollection<TKey> Keys { get; }
    ICollection<TValue> Values { get; }
}

public struct KeyValuePair<TKey, TValue>
{
    private TKey key;
    private TValue value;
    public KeyValuePair(TKey key, TValue value);
    public TKey Key { get; }
    public TValue Value { get; }
    public override string ToString();
}