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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.
/*============================================================
**
** Interface: KeyValuePair
**
**
**
**
** Purpose: Generic key-value pair for dictionary enumerators.
**
**
===========================================================*/
namespace System.Collections.Generic {
using System;
using System.Text;
// 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);
}
}
// 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]
public struct KeyValuePair<TKey, TValue> {
private TKey key;
private TValue value;
public KeyValuePair(TKey key, TValue value) {
this.key = key;
this.value = value;
}
public TKey Key {
get { return key; }
}
public TValue Value {
get { return value; }
}
public override string ToString() {
StringBuilder s = StringBuilderCache.Acquire();
s.Append('[');
if( Key != null) {
s.Append(Key.ToString());
}
s.Append(", ");
if( Value != null) {
s.Append(Value.ToString());
}
s.Append(']');
return StringBuilderCache.GetStringAndRelease(s);
}
// BLOCKED (do not add now): [EditorBrowsable(EditorBrowsableState.Never)]
public void Deconstruct(out TKey key, out TValue value)
{
key = Key;
value = Value;
}
}
}
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