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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.ComponentModel;
using System.Diagnostics;
using System.Text;
namespace System.Collections.Generic
// Provides the Create factory method for KeyValuePair<TKey, TValue>.
public static class KeyValuePair
// Creates a new KeyValuePair<TKey, TValue> from the given values.
public static KeyValuePair<TKey, TValue> Create<TKey, TValue>(TKey key, TValue value) =>
new KeyValuePair<TKey, TValue>(key, value);
/// <summary>Used by KeyValuePair.ToString to reduce generic code</summary>
internal static string PairToString(object? key, object? value) =>
string.Create(null, stackalloc char[256], $"[{key}, {value}]");
// A KeyValuePair holds a key and a value from a dictionary.
// It is used by the IEnumerable<T> implementation for both IDictionary<TKey, TValue>
// and IReadOnlyDictionary<TKey, TValue>.
[System.Runtime.CompilerServices.TypeForwardedFrom("mscorlib, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public readonly struct KeyValuePair<TKey, TValue>
private readonly TKey key; // Do not rename (binary serialization)
private readonly TValue value; // Do not rename (binary serialization)
public KeyValuePair(TKey key, TValue value)
this.key = key;
this.value = value;
public TKey Key => key;
public TValue Value => value;
public override string ToString()
return KeyValuePair.PairToString(Key, Value);
public void Deconstruct(out TKey key, out TValue value)
key = Key;
value = Value;