使用LINQ从字符串中删除字符 [英] Removing characters from strings with LINQ

问题描述

我正在尝试通过编写一些简单的扩展方法来完善我的LINQ.有没有更好的方法来编写如下所示的函数(使用LINQ)从字符串中删除给定的字符列表?

I'm trying to brush up on my LINQ by writing some simple extension methods. Is there any better way to write such a function as below that removes a given list of characters from a string (using LINQ)?

这有助于我想到LINQ首先依赖的扩展方法:

It helps me to think of the extension methods that LINQ relies on first:

public static string Remove(this string s, IEnumerable<char> chars)
{
    string removeChars = string.Concat(chars);

    return new string(s.ToCharArray().Where(c => !removeChars.Contains(c)).ToArray());
}

但这很丑陋. Ergo LINQ.

But that's pretty ugly. Ergo LINQ.

我在LINQ语句中注意到的差异是我必须使用选择"，而使用扩展方法则不必.

/// <summary>Strip characters out of a string.</summary>
/// <param name="chars">The characters to remove.</param>
public static string Remove(this string s, IEnumerable<char> chars)
{
    string removeChars = string.Concat(chars);

    var stripped = from c in s.ToCharArray()
                   where !removeChars.Contains(c)
                   select c;

    return new string(stripped.ToArray());
}

所以我想知道这(上面的最后一个片段)是否是完成字符删除的最有趣的LINQ语句.

So I'm wondering if this (last snippet above) is the tersest LINQ statement to accomplish removal of characters.

推荐答案

我希望第一种具有扩展方法的形式虽然简化为

I would prefer the first form with extension methods though simplified to

public static string Remove(this string s, IEnumerable<char> chars)
{
    return new string(s.Where(c => !chars.Contains(c)).ToArray());
}

对于 select 关键字，它是第二种形式的必填项. 文档表示查询表达式必须以select子句终止或组子句".这就是为什么我会避免使用LINQ语法糖.

As for select keyword, it's obligatory in second form. The documentation says what "A query expression must terminate with either a select clause or a group clause". That's why I would avoid LINQ syntactic sugar.

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