优雅的方式来元素的多个集合结合？

问题描述

说我有，相同类型的每个包含对象（例如，名单，LT集合任意数量; INT＆GT;富和列表＆LT; INT＆GT;酒吧）。如果这些藏品是他们自己的集合（例如，键入列表与LT的;列表＆LT; INT＆GT;＆GT; ，我可以使用的SelectMany 将它们全部组合成一个集合。

Say I have an arbitrary number of collections, each containing objects of the same type (for example, List<int> foo and List<int> bar). If these collections were themselves in a collection (e.g., of type List<List<int>>, I could use SelectMany to combine them all into one collection.

不过，如果这些集合尚未同一个集合中，这是我不得不写这样的方法我的IM pression：

However, if these collections are not already in the same collection, it's my impression that I'd have to write a method like this:

public static IEnumerable<T> Combine<T>(params ICollection<T>[] toCombine)
{
   return toCombine.SelectMany(x => x);
}

这我然后调用是这样的：

Which I'd then call like this:

var combined = Combine(foo, bar);

有没有结合（任何数量的）的集合，而无需编写上述像的实用方法结合一个干净，优雅的方式？它似乎很简单，应该有一个办法做到这一点的LINQ，但也许不是。

Is there a clean, elegant way to combine (any number of) collections without having to write a utility method like Combine above? It seems simple enough that there should be a way to do it in LINQ, but perhaps not.

推荐答案

我想你可能会寻找LINQ的<$c$c>.Concat()?

I think you might be looking for LINQ's .Concat()?

var combined = foo.Concat(bar).Concat(foobar).Concat(...);

另外， .Union（）将删除重复的元素。

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