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 运行 时间执行相同的性能

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}";

我的目标是：（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？ 如果有，有更好的方法吗？

另外我觉得换行不是一个好的答案><

Answer 1

TLDR String.Format 被调用进行插值，因此连接被插值的字符串意味着对 String.Format

的更多调用

我们来看看IL

当你有这些问题时，为了更好地了解实际发生了什么，最好查看 IL（中间语言），这是你的代码被编译成然后 运行 .NET 运行时间。您可以使用 ildasm 检查已编译的 .NET DLL 和 EXE 的 IL。

连接多个字符串

所以在这里你可以看到在幕后，每个连接的字符串都被调用了 String.Format。

使用一个长字符串

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