KeyValuePair.cs

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using System.ComponentModel;
using System.Diagnostics;
using System.Runtime.CompilerServices;
 
namespace System.Collections.Generic;
 
public static class KeyValuePair
{
    public static KeyValuePair<TKey, TValue> Create<TKey, TValue>(TKey key, TValue value)
    {
        return new KeyValuePair<TKey, TValue>(key, value);
    }
 
    internal static string PairToString(object key, object value)
    {
        IFormatProvider formatProvider = null;
        IFormatProvider provider = formatProvider;
        Span<char> initialBuffer = stackalloc char[256];
        DefaultInterpolatedStringHandler handler = new DefaultInterpolatedStringHandler(4, 2, formatProvider, initialBuffer);
        handler.AppendLiteral("[");
        handler.AppendFormatted<object>(key);
        handler.AppendLiteral(", ");
        handler.AppendFormatted<object>(value);
        handler.AppendLiteral("]");
        return string.Create(provider, initialBuffer, ref handler);
    }
}
[Serializable]
[TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public readonly struct KeyValuePair<TKey, TValue>
{
    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    private readonly TKey key;
 
    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    private readonly TValue value;
 
    public TKey Key => key;
 
    public TValue Value => value;
 
    public KeyValuePair(TKey key, TValue value)
    {
        this.key = key;
        this.value = value;
    }
 
    public override string ToString()
    {
        return KeyValuePair.PairToString(Key, Value);
    }
 
    [EditorBrowsable(EditorBrowsableState.Never)]
    public void Deconstruct(out TKey key, out TValue value)
    {
        key = Key;
        value = Value;
    }
}