c# - 有没有一种方法可以在 C# 中将内插字符串拆分为多行，同时在性能方面在运行时执行相同的操作

Question

我一直在与同事讨论格式化以下代码的最佳方式。

return $" this is a really long string.{a} this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string.{b} this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string. this is a really long string.{c}";

我的 goto 是:(在预先指定的点换行，即大约 80 个字符)

return  $" this is a really long string.{a} this is a really long string. this is a really long string." +
        $" this is a really long string. this is a really long string. this is a really long string." +
        $" this is a really long string. this is a really long string. this is a really long string." +
        $" this is a really long string. this is a really long string. this is a really long string." +
        $"{b} this is a really long string. this is a really long string. this is a really long string." +
        $" this is a really long string. this is a really long string. this is a really long string.{c}";

但是我担心我在运行时添加了不必要的工作。是这样吗？如果是这样，是否有更好的方法？

另外我觉得换行不是一个好的答案><

Answer 1

TLDR String.Format 被调用用于插值，因此连接被插值的字符串意味着对 String.Format 的更多调用

让我们看看IL

当您有这些问题时，要更好地了解实际发生了什么，最好查看 IL(中间语言)，它是您的代码被编译成然后在 .NET 运行时上运行的语言。您可以使用 ildasm用于检查已编译的 .NET DLL 和 EXE 的 IL。

连接多个字符串

所以在这里您可以看到在幕后，正在为每个连接的字符串调用 String.Format。

使用一个长字符串

在这里您看到字符串格式只被调用一次，这意味着如果您以这种方式谈论性能会稍微好一些。