JD2022-TU1/main/tools/framework/JD.Collections/Extensions/KeyedCollectionExtensions.cs

using JD.Collections.Interfaces;

namespace JD.Collections.Extensions
{
    /// <summary>
    /// Adds behavior on KeyedCollection based on features of the interface.
    /// </summary>
    public static class KeyedCollectionExtensions
    {
        /// <summary>
        /// Returns the value corresponding to the given key in the dictionary or the default value if the key is not in the dictionary.
        /// </summary>
        public static TValue ValueOrDefault<TKey, TValue>(this IKeyedCollection<TKey, TValue> collection, TKey key)
        {
            TValue result;
            collection.TryGetValue(key, out result);
            return result;
        }

        /// <summary>
        /// Returns the value corresponding to the given key in the dictionary or the default value if the key is not in the dictionary.
        /// </summary>
        public static bool TryGetValue<TKey, TValue>(this System.Collections.ObjectModel.KeyedCollection<TKey, TValue> collection, TKey key, out TValue value)
        {
            if (collection.Contains(key))
            {
                value = collection[key];
                return true;
            }
            value = default(TValue);
            return false;
        }
    }
}