如何使用Linq聚合使用单引号 [英] How to use Linq aggregate with single quotes

问题描述

让我们假设我有一个字符串集合，像这样:

Let's assume that I have a collection of strings, like so:

IList<string> myList = new List<string>(){"one", "two", "three"};

使用myList.Aggregate我想最后加上'一个"，两个"，三个"(包括单引号)

Using myList.Aggregate I would like to end up with "'one', 'two', 'three'" (including single quotes)

有人仅使用Aggregate函数就能做到这一点吗?我在想些什么

Does someone have a sleak way of doing this, only using the Aggregate function? I was thinking something in the lines of

myList.Aggregate((increment, seed) => string.Concat(increment, ", ", seed));

但这只是解决方案的一半.

but that's only half the solution.

推荐答案

是否有理由使用Aggregate而不是更简单的string.Join?

Any reason to use Aggregate rather than the simpler string.Join?

string joined = string.Join(", ", myCollection.Select(x => "'" + x + "'"));

(如果使用的是.NET 3.5，则添加ToArray调用.)

(Add a ToArray call if you're using .NET 3.5.)

您可以使用Aggregate(理想情况下使用StringBuilder)实现string.Join，但这并不令人愉快.假设一个非空集合，我认为应该这样做:

You can implement string.Join using Aggregate (ideally using a StringBuilder) but it's not terribly pleasant. Assuming a non-empty collection, I think this should do it:

string csv = myCollection.Aggregate(new StringBuilder("'"),
                 (sb, x) => sb.AppendFormat("{0}', '"),
                 sb => { sb.Length -= 3;
                         return sb.ToString(); });

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