IReadOnlyDictionary.cs

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using System.Diagnostics.CodeAnalysis;
 
namespace System.Collections.Generic;
 
public interface IReadOnlyDictionary<TKey, TValue> : IReadOnlyCollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, IEnumerable
{
    TValue this[TKey key] { get; }
 
    IEnumerable<TKey> Keys { get; }
 
    IEnumerable<TValue> Values { get; }
 
    bool ContainsKey(TKey key);
 
    bool TryGetValue(TKey key, [MaybeNullWhen(false)] out TValue value);
}