获取C#中的键值对列表的所有可能组合 [英] Getting all possible combinations of a List of KeyValue Pairs in C#

问题描述

我有一个像这样的键值对:

I have a key value pair like this:

var accounts = new List<KeyValuePair<int,int>>();

，帐户内容如下:

{[4,10000]}
{[4,19000]}
{[4,11000]}
{[4,12000]}
{[4,13036]}
{[4,47100]}
{[5,19300]}
{[5,32900]}
{[5,95800]}
{[6,95800]}

如何获得accounts中的键值对的所有可能的组合，使得我拥有:

How can I get all possible combinations of the key value pairs in accounts such that I have:

[{4,10000},{5,19300},{6,95800}],
[{4,10000},{5,32900},{6,95800}].....

包含最终结果的数据结构对我而言并不重要，我只是想尽可能高效地实现这一目标

The data structure containing the final result is not of much importance to me, I'm just interested in achieving this as efficiently as possible

推荐答案

经过短暂搜索，我发现您可以使用

after a short search i found that you can do it using the CartesianProduct Extension Method from Eric Lippert's Blog:

var result = list.GroupBy(t => t.Key).CartesianProduct();

正在执行的操作:

static IEnumerable<IEnumerable<T>> CartesianProduct<T>(
  this IEnumerable<IEnumerable<T>> sequences) 
{ 
  IEnumerable<IEnumerable<T>> emptyProduct = new[] { Enumerable.Empty<T>() }; 
  return sequences.Aggregate( 
    emptyProduct, 
    (accumulator, sequence) => 
      from accseq in accumulator 
      from item in sequence 
      select accseq.Concat(new[] {item})); 
}

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