ToDictionaryBatching

ToDictionaryBatching.cs

public static class DictionaryPerfomanceExtensions
{
    public static void ToDictionaryBatching<T, TKey1>(this T[] array,
        Func<T, TKey1> keySelector1, out Dictionary<TKey1, T> dictionary1
        )
    {
        dictionary1 = new Dictionary<TKey1, T>(array.Length);

        for (int i = 0; i < array.Length; i++)
        {
            dictionary1.Add(keySelector1(array[i]), array[i]);
        }
    }

    public static void ToDictionaryBatching<T, TKey1, TKey2>(this T[] array,
        Func<T, TKey1> keySelector1, out Dictionary<TKey1, T> dictionary1,
        Func<T, TKey2> keySelector2, out Dictionary<TKey2, T> dictionary2
        )
    {
        dictionary1 = new Dictionary<TKey1, T>(array.Length);
        dictionary2 = new Dictionary<TKey2, T>(array.Length);

        for (int i = 0; i < array.Length; i++)
        {
            dictionary1.Add(keySelector1(array[i]), array[i]);
            dictionary2.Add(keySelector2(array[i]), array[i]);
        }
    }

    public static void ToDictionaryBatching<T, TKey1, TKey2, TKey3>(this T[] array,
        Func<T, TKey1> keySelector1, out Dictionary<TKey1, T> dictionary1,
        Func<T, TKey2> keySelector2, out Dictionary<TKey2, T> dictionary2,
        Func<T, TKey3> keySelector3, out Dictionary<TKey3, T> dictionary3
        )
    {
        dictionary1 = new Dictionary<TKey1, T>(array.Length);
        dictionary2 = new Dictionary<TKey2, T>(array.Length);
        dictionary3 = new Dictionary<TKey3, T>(array.Length);

        for (int i = 0; i < array.Length; i++)
        {
            dictionary1.Add(keySelector1(array[i]), array[i]);
            dictionary2.Add(keySelector2(array[i]), array[i]);
            dictionary3.Add(keySelector3(array[i]), array[i]);
        }
    }

    public static void ToDictionaryBatching<T, TKey1, TKey2, TKey3, TKey4>(this T[] array,
        Func<T, TKey1> keySelector1, out Dictionary<TKey1, T> dictionary1,
        Func<T, TKey2> keySelector2, out Dictionary<TKey2, T> dictionary2,
        Func<T, TKey3> keySelector3, out Dictionary<TKey3, T> dictionary3,
        Func<T, TKey4> keySelector4, out Dictionary<TKey4, T> dictionary4
        )
    {
        dictionary1 = new Dictionary<TKey1, T>(array.Length);
        dictionary2 = new Dictionary<TKey2, T>(array.Length);
        dictionary3 = new Dictionary<TKey3, T>(array.Length);
        dictionary4 = new Dictionary<TKey4, T>(array.Length);

        for (int i = 0; i < array.Length; i++)
        {
            dictionary1.Add(keySelector1(array[i]), array[i]);
            dictionary2.Add(keySelector2(array[i]), array[i]);
            dictionary3.Add(keySelector3(array[i]), array[i]);
            dictionary4.Add(keySelector4(array[i]), array[i]);
        }
    }
}