EasyDevCoreV4/EasyDevCore.Common/Helper/DictionaryHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EasyDevCore.Common
{
    /// <summary>
    /// 
    /// </summary>
    public static class DictionaryHelper
    {
        /// <summary>
        /// Tries to get a value in dictionary.
        /// </summary>
        /// <typeparam name="TKey">The type of the key.</typeparam>
        /// <typeparam name="TValue">The type of the value.</typeparam>
        /// <param name="dict">The dictionary.</param>
        /// <param name="key">The key.</param>
        /// <param name="defaultValue">The default value if key not exists.</param>
        /// <returns></returns>
        public static TValue GetOrDefault<TKey,TValue>(this IDictionary<TKey, TValue> dict, TKey key, TValue defaultValue)
        => dict.ContainsKey(key) ? dict[key] : defaultValue;

        /// <summary>
        /// Gets the or add.
        /// </summary>
        /// <typeparam name="TKey">The type of the key.</typeparam>
        /// <typeparam name="TValue">The type of the value.</typeparam>
        /// <param name="dict">The dictionary.</param>
        /// <param name="key">The key.</param>
        /// <param name="defaultValue">The default value will add and return if key not exits</param>
        /// <returns></returns>
        public static TValue GetOrAdd<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, TValue defaultValue)
        {
            if (!dict.ContainsKey(key))
            {
                dict[key] = defaultValue;
            }
            return (TValue)dict[key];
        }
    }
}