Havret

using System;
using System.Threading.Tasks;

namespace System.Collections.Concurrent
{
    public static class ConcurrentDictionaryExtensions
    {
        /// <summary>
        /// Provides an alternative to <see cref="ConcurrentDictionary{TKey, TValue}.GetOrAdd(TKey, Func{TKey, TValue})"/> that disposes values that implement <see cref="IDisposable"/>.
        /// </summary>