c# - 在 C# switch 表达式中使用 block ？

Question

我找不到解决此问题的文档。 (也许我只是不擅长使用谷歌......)
我的猜测是答案是否定的，但是我不明白文档中在哪里解决了这个问题。
准确地说，我的问题如下。

假设，我想执行这样的事情:

DirectoryInfo someDir = new DirectoryInfo(@".\someDir");
Console.WriteLine($"Would you like to delete the directory {someDir.FullName}?");
string response = Console.ReadLine().ToLower();

response switch
{
    "yes" => { someDir.Delete(); ... MoreActions},
     _ => DoNothing()
};

我知道我可以通过使用常规 switch 或 if/else 来实现所需的行为，但是我很好奇在这种情况下是否可以使用 switch 表达式。

Answer 1

however I didn't understand where this is addressed in the documentation

这个说的很清楚 here :

There are several syntax improvements here:

• The variable comes before the switch keyword. The different order makes it visually easy to distinguish the switch expression from the switch statement.
• The case and : elements are replaced with =>. It's more concise and intuitive.
• The default case is replaced with a _ discard.
• The bodies are expressions, not statements.

{ someDir.Delete(); ... MoreActions}不是表达式。

但是，正如他们所说，您可以滥用每个功能:)

您可以使 switch 表达式计算为 Action ，并调用该操作:

Action a = response switch
{
    "yes" => () => { ... },
     _ => () => { .... }
};
a();

您甚至可以将其简化为单个语句:

(response switch
{
    "yes" => (Action)(() => { ... }),
     _ => () => { ... }
})();

但不要这样做...