77 lines
2.9 KiB
C#
77 lines
2.9 KiB
C#
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namespace Unosquare.Swan
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{
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using System;
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using System.Collections.Generic;
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/// <summary>
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/// Extension methods.
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/// </summary>
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public static partial class Extensions
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{
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/// <summary>
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/// Gets the value if exists or default.
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/// </summary>
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/// <typeparam name="TKey">The type of the key.</typeparam>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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/// <param name="dict">The dictionary.</param>
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/// <param name="key">The key.</param>
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/// <param name="defaultValue">The default value.</param>
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/// <returns>
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/// The value of the provided key or default.
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/// </returns>
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/// <exception cref="ArgumentNullException">dict.</exception>
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public static TValue GetValueOrDefault<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, TValue defaultValue = default)
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{
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if (dict == null)
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throw new ArgumentNullException(nameof(dict));
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return dict.ContainsKey(key) ? dict[key] : defaultValue;
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}
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/// <summary>
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/// Adds a key/value pair to the Dictionary if the key does not already exist.
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/// If the value is null, the key will not be updated.
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///
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/// Based on <c>ConcurrentDictionary.GetOrAdd</c> method.
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/// </summary>
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/// <typeparam name="TKey">The type of the key.</typeparam>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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/// <param name="dict">The dictionary.</param>
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/// <param name="key">The key.</param>
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/// <param name="valueFactory">The value factory.</param>
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/// <returns>The value for the key.</returns>
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public static TValue GetOrAdd<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, Func<TKey, TValue> valueFactory)
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{
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if (dict == null)
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throw new ArgumentNullException(nameof(dict));
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if (!dict.ContainsKey(key))
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{
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var value = valueFactory(key);
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if (Equals(value, default)) return default;
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dict[key] = value;
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}
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return dict[key];
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}
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/// <summary>
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/// Executes the item action for each element in the Dictionary.
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/// </summary>
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/// <typeparam name="TKey">The type of the key.</typeparam>
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/// <typeparam name="TValue">The type of the value.</typeparam>
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/// <param name="dict">The dictionary.</param>
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/// <param name="itemAction">The item action.</param>
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/// <exception cref="ArgumentNullException">dict.</exception>
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public static void ForEach<TKey, TValue>(this IDictionary<TKey, TValue> dict, Action<TKey, TValue> itemAction)
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{
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if (dict == null)
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throw new ArgumentNullException(nameof(dict));
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foreach (var kvp in dict)
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{
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itemAction(kvp.Key, kvp.Value);
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}
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}
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}
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}
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