c# - List>的组合

Question

我有一个这种类型的列表> 包含这个

List<int> A = new List<int> {1, 2, 3, 4, 5};
List<int> B = new List<int> {0, 1};
List<int> C = new List<int> {6};
List<int> X = new List<int> {....,....};

我想要这样的所有组合

1-0-6
1-1-6
2-0-6
2-1-6
3-0-6

等等。

根据您的说法，使用 Linq 可以解决这个问题吗？

Answer 1

它与 this answer 非常相似我给了另一个问题:

var combinations = from a in A
                   from b in B
                   from c in C
                   orderby a, b, c
                   select new List<int> { a, b, c };

var x = combinations.ToList();

对于可变数量的输入，现在添加了泛型:

var x = AllCombinationsOf(A, B, C);

public static List<List<T>> AllCombinationsOf<T>(params List<T>[] sets)
{
    // need array bounds checking etc for production
    var combinations = new List<List<T>>();

    // prime the data
    foreach (var value in sets[0])
        combinations.Add(new List<T> { value });

    foreach (var set in sets.Skip(1))
        combinations = AddExtraSet(combinations, set);

    return combinations;
}

private static List<List<T>> AddExtraSet<T>
     (List<List<T>> combinations, List<T> set)
{
    var newCombinations = from value in set
                          from combination in combinations
                          select new List<T>(combination) { value };

    return newCombinations.ToList();
}