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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.
// See the LICENSE file in the project root for more information.
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)
{
return new KeyValuePair<TKey, TValue>(key, value);
}
/// <summary>
/// Used by KeyValuePair.ToString to reduce generic code
/// </summary>
internal static string PairToString(object? key, object? value)
{
var s = new ValueStringBuilder(stackalloc char[64]);
s.Append('[');
if (key != null)
{
s.Append(key.ToString());
}
s.Append(", ");
if (value != null)
{
s.Append(value.ToString());
}
s.Append(']');
return s.ToString();
}
}
// 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>.
[Serializable]
[System.Runtime.CompilerServices.TypeForwardedFrom("mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public readonly struct KeyValuePair<TKey, TValue>
{
[DebuggerBrowsable(DebuggerBrowsableState.Never)]
private readonly TKey key; // Do not rename (binary serialization)
[DebuggerBrowsable(DebuggerBrowsableState.Never)]
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);
}
[EditorBrowsable(EditorBrowsableState.Never)]
public void Deconstruct(out TKey key, out TValue value)
{
key = Key;
value = Value;
}
}
}
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