/// <summary>
/// Try to get a first and single occurrency value from all <see cref="ConcurrentDictionary{TKey, TValue}.Values"/> entries.
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="collection"></param>
/// <param name="predicate"></param>
/// <param name="value"></param>
/// <exception cref="InvalidOperationException"></exception>
/// <returns></returns>
public static bool TryGetValueSingle <TKey, TValue>(this ConcurrentDictionary <TKey, TValue> collection, Predicate <TKey> predicate, out TValue value)
{
var result = collection.EntryWhereAsParallel(entry => predicate.Invoke(entry.Key));
if (result == null)
{
value = default;
return(false);
}
value = result[0].Value;
return(true);
}
/// <summary>
/// Try to get all occurrency values from all <see cref="ConcurrentDictionary{TKey, TValue}.Keys"/> entries.
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="collection"></param>
/// <param name="predicate"></param>
/// <exception cref="InvalidOperationException"></exception>
/// <returns></returns>
public static TKey[] KeyFromValueWhereAsParallel <TKey, TValue>(this ConcurrentDictionary <TKey, TValue> collection, Predicate <TValue> predicate)
{
if (collection == null)
{
throw new InvalidOperationException("Collection must be not null.");
}
var result = collection.EntryWhereAsParallel(entry => predicate.Invoke(entry.Value));
if (result == null)
{
return(Array.Empty <TKey>());
}
return(result.Select(entry => entry.Key).ToArray());
}
/// <summary>
/// Try to get a first and single occurrency key from all <see cref="ConcurrentDictionary{TKey, TValue}.Keys"/> entries.
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="collection"></param>
/// <param name="predicate"></param>
/// <param name="key"></param>
/// <exception cref="InvalidOperationException"></exception>
/// <returns></returns>
public static bool TryGetKeySingle <TKey, TValue>(this ConcurrentDictionary <TKey, TValue> collection, Predicate <TValue> predicate, out TKey key)
{
if (collection == null)
{
throw new InvalidOperationException("Collection must be not null.");
}
var result = collection.EntryWhereAsParallel(entry => predicate.Invoke(entry.Value));
if (result == null)
{
key = default;
return(false);
}
key = result[0].Key;
return(true);
}
