有没有办法在 C# 中将插值字符串拆分为多行，同时在运行时执行相同的性能

Question

我一直在与同事讨论格式化以下代码的最佳方法。

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}";

我的转到是：（预先指定点上的换行符，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，有更好的方法吗？

另外我不认为换行是一个好的答案><

Answer 1

TLDR String.Format 正在被调用进行插值，因此连接正在插值的字符串意味着对 String.Format 的更多调用

我们看一下IL

当您遇到这些问题时，为了更好地了解实际发生的情况，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检查已编译的 .NET DLL 和 EXE 的 IL。

连接多个字符串

因此，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。

使用一根长字符串

在这里您可以看到字符串格式仅被调用一次，这意味着如果您谈论性能，这种方式会稍微好一些。