<PackageReference Include="NETStandard.Library" Version="2.0.2" />

System.Collections.ObjectModel.ReadOnlyDictionary<TKey, TValue>

public class ReadOnlyDictionary<TKey, TValue> : ICollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, IEnumerable, IDictionary<TKey, TValue>, IReadOnlyCollection<KeyValuePair<TKey, TValue>>, IReadOnlyDictionary<TKey, TValue>, ICollection, IDictionary
namespace System.Collections.ObjectModel { public class ReadOnlyDictionary<TKey, TValue> : ICollection<KeyValuePair<TKey, TValue>>, IEnumerable<KeyValuePair<TKey, TValue>>, IEnumerable, IDictionary<TKey, TValue>, IReadOnlyCollection<KeyValuePair<TKey, TValue>>, IReadOnlyDictionary<TKey, TValue>, ICollection, IDictionary { public sealed class KeyCollection : ICollection<TKey>, IEnumerable<TKey>, IEnumerable, IReadOnlyCollection<TKey>, ICollection { public int Count { get; } public void CopyTo(TKey[] array, int arrayIndex); public IEnumerator<TKey> GetEnumerator(); } public sealed class ValueCollection : ICollection<TValue>, IEnumerable<TValue>, IEnumerable, IReadOnlyCollection<TValue>, ICollection { public int Count { get; } public void CopyTo(TValue[] array, int arrayIndex); public IEnumerator<TValue> GetEnumerator(); } public int Count { get; } protected IDictionary<TKey, TValue> Dictionary { get; } public TValue this[TKey key] { get; } public KeyCollection Keys { get; } TValue IDictionary<TKey, TValue>.this[TKey key] { get; set; } object IDictionary.this[object key] { get; set; } public ValueCollection Values { get; } public ReadOnlyDictionary(IDictionary<TKey, TValue> dictionary); public bool ContainsKey(TKey key); public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator(); public bool TryGetValue(TKey key, out TValue value); } }