c# - 如何使用 LINQ 从列表中获取逗号分隔的值列表？

Question

我有一个短语列表:List<Phrase>其中 Phrase 对象的属性为 PhraseId .我需要做的是获取一个字符串，该字符串由用单引号括起来的每个 Id 和后跟一个“，”组成，但最后一个 PhraseId 除外？

换句话说，我想要一个看起来像这样的字符串:

'id1','id2','id3'

我看过 LINQ Select 命令，但我认为这只是给了我另一个列表。

谁能建议我该怎么做？

Answer 1

这应该可行

var result = string.Join(",", phrases.Select(x => $"'{x.PhraseId}'"));

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其他资源

String.Join Method

Concatenates the elements of a specified array or the members of a collection, using the specified separator between each element or member.

Enumerable.Select Method

Projects each element of a sequence into a new form.

$ - string interpolation (C# Reference)

The $ special character identifies a string literal as an interpolated string. An interpolated string is a string literal that might contain interpolated expressions. When an interpolated string is resolved to a result string, items with interpolated expressions are replaced by the string representations of the expression results. This feature is available in C# 6 and later versions of the language.