是否有与 C 的逗号运算符等效的惯用 C#? [英] Is there idiomatic C# equivalent to C's comma operator?

问题描述

我在 C# 中使用了一些函数式的东西，并且一直被 List.Add 不返回更新列表的事实所困扰.

I'm using some functional stuff in C# and keep getting stuck on the fact that List.Add doesn't return the updated list.

一般来说，我想在一个对象上调用一个函数，然后返回更新后的对象.

In general, I'd like to call a function on an object and then return the updated object.

例如，如果 C# 有一个逗号运算符就好了:

For example it would be great if C# had a comma operator:

((accum, data) => accum.Add(data), accum)

我可以像这样编写自己的逗号运算符":

I could write my own "comma operator" like this:

static T comma(Action a, Func<T> result) {
    a();
    return result();
}

看起来它可以工作，但呼叫站点会很难看.我的第一个例子是这样的:

It looks like it would work but the call site would ugly. My first example would be something like:

((accum, data) => comma(accum.Add(data), ()=>accum))

足够的例子！如果没有其他开发人员稍后出现并对代码气味皱眉，那么最干净的方法是什么?

Enough examples! What's the cleanest way to do this without another developer coming along later and wrinkling his or her nose at the code smell?

推荐答案

使用 C# 3.0 中的代码块，您几乎可以自然地完成第一个示例.

You can do almost exactly the first example naturally using code blocks in C# 3.0.

((accum, data) => { accum.Add(data); return accum; })

这篇关于是否有与 C 的逗号运算符等效的惯用 C#?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！