交织一系列电子邮件地址，避免具有相同域的项连续 [英] Interleave an array of email addresses avoiding items with same domain to be consecutive

问题描述

我正在寻找一种有效的方法来对一组电子邮件地址进行排序，以避免在C＃中具有相同域的项是连续的。

I'm looking for an efficient way of sorting an array of email addresses to avoid items with the same domain to be consecutive, in C#.

内部的电子邮件地址

示例：

给出一个包含以下内容的数组：以下条目：

Given an array with the following entries:

[e-mail]
[e-mail]
[e-mail]
[e-mail]

我想获得类似于以下内容：

I would like to obtain something similar to the following:

[e-mail]    
[e-mail]
[e-mail]
[e-mail]

推荐答案

借助扩展方法（从 https://stackoverflow.com/a/27533369/172769 窃取） ，您可以这样操作：

With the help of an extension method (stolen from https://stackoverflow.com/a/27533369/172769), you can go like this:

List<string> emails = new List<string>();
emails.Add("[e-mail]");
emails.Add("[e-mail]");
emails.Add("[e-mail]");
emails.Add("[e-mail]");

var q = emails.GroupBy(m => m.Split('@')[1]).Select(g => new List<string>(g)).Interleave();

Interleave 方法的定义为：

public static IEnumerable<T> Interleave<T>(this IEnumerable<IEnumerable<T>> source )
{
    var queues = source.Select(x => new Queue<T>(x)).ToList();
    while (queues.Any(x => x.Any())) {
        foreach (var queue in queues.Where(x => x.Any())) {
            yield return queue.Dequeue();
        }
    }
}

基本上，我们创建了组根据电子邮件地址的域部分，将每个组投影（或选择）到 List< string> ，然后交织这些列表。

So basically, we create groups based on the domain part of the email adresses, project (or Select) each group into a List<string>, and then "Interleave" those lists.

我已经对您的样本数据进行了测试，但是可能需要更彻底的测试才能发现边缘情况。

I have tested against your sample data, but more thorough testing might be needed to find edge cases.

DotNetFiddle代码段

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