Array、List、Dictionaryの速度比較

IEnumerable<T> datas;
// 何かデータ取得処理
･･･

var sw = new Stopwatch();
sw.Start();
var array = datas.ToArray();
sw.Stop();
Console.WriteLine("Array変換：{0}", sw.Elapsed);

sw.Reset();
sw.Start();
var list = datas.ToList();
sw.Stop();
Console.WriteLine("List変換：{0}", sw.Elapsed);

sw.Reset();
sw.Start();
var dictionary = datas.ToDictionary(x => x.Id);
sw.Stop();
Console.WriteLine("Dictionary変換：{0}", sw.Elapsed);

// 検索キー取得
var Id = datas.OrderBy(x => Guid.NewGuid()).First().Id;

Console.WriteLine("Id：{0}", Id);

sw.Reset();
sw.Start();
var data1 = array.First(x => x.Id == Id);
sw.Stop();
Console.WriteLine("Array検索：{0}", sw.Elapsed);

sw.Reset();
sw.Start();
var data2 = list.First(x => x.Id == Id);
sw.Stop();
Console.WriteLine("List検索：{0}", sw.Elapsed);

sw.Reset();
sw.Start();
var data3 = dictionary[Id];
sw.Stop();
Console.WriteLine("Dictionary検索：{0}", sw.Elapsed);