我該如何排序列表 <Tuple<int, double> &gt;

Question

您好，感謝您閱讀此帖。

我有一個以這種方式創建的列表

List<Tuple<int, double>> Ratings = new List<Tuple<int, double>>();

讓我們說清單的價值如下

Index      int     double

[0]        1       4,5
[1]        4       1,0
[2]        3       5,0
[3]        2       2,5

如何對列表進行排序，以便最高的雙值？ 像這樣

Index      int     double
[0]        3       5,0
[1]        1       4,5
[2]        2       2,5
[3]        4       1,0

Answer 1

Ratings.OrderByDescending(t => t.Item2);

Answer 2

你可以簡單地使用

Ratings = Ratings.OrderByDescending (t => t.Item2).ToList();

Answer 3

您是否嘗試過使用列表中的Sort方法，intellisense應該向您建議它，它有點自然：

Ratings.Sort((x, y) => y.Item2.CompareTo(x.Item2));
// at this stage the Ratings list will be sorted as desired

Answer 4

List<Tuple<int, double>> Ratings = new List<Tuple<int, double>>();

                    Ratings.Add(new Tuple<int, double>(1, 4.5));
                    Ratings.Add(new Tuple<int, double>(4, 1.0));
                    Ratings.Add(new Tuple<int, double>(3, 5.0));
                    Ratings.Add(new Tuple<int, double>(2, 2.5));

                    var list = Ratings.OrderByDescending(c => c.Item2).ToList();

Answer 5

var comparer = Comparer<Tuple<int, double>>.Create((x, y) => -1 * x.Item2.CompareTo(y.Item2));
Ratings.Sort(comparer);