csharp [AddOrUpdate]あれば更新，なければ添加#ExtensionMethod

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public static TValue AddOrUpdate<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, TValue addValue, Func<TKey, TValue, TValue> updateValueFactory)
  => dict[key] = dict.TryGetValue(key, out TValue result) ? updateValueFactory(key, result) : addValue;

public static TValue AddOrUpdate<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, TValue addValue, Func<TValue, TValue> updateValueFactory)
  => dict[key] = dict.TryGetValue(key, out TValue result) ? updateValueFactory(result) : addValue;

public static TValue AddDefaultOrUpdate<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, Func<TKey, TValue, TValue> updateValueFactory)
  => dict.AddOrUpdate(key, default(TValue), updateValueFactory);

public static TValue AddDefaultOrUpdate<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, Func<TValue, TValue> updateValueFactory)
  => dict.AddOrUpdate(key, default(TValue), updateValueFactory);

public static TValue AddOrUpdate<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, Func<TKey, TValue> addValueFactory, Func<TKey, TValue, TValue> updateValueFactory)
  => dict[key] = dict.TryGetValue(key, out TValue result) ? updateValueFactory(key, result) : addValueFactory(key);

public static TValue AddOrUpdate<TKey, TValue>(this IDictionary<TKey, TValue> dict, TKey key, Func<TValue> addValueFactory, Func<TValue, TValue> updateValueFactory)
  => dict[key] = dict.TryGetValue(key, out TValue result) ? updateValueFactory(result) : addValueFactory();

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