C# switch case one line with fallthrough

Question

Recently as of C# 8.0 they introduced a new switch case that is rapidly replacing our nested ternary if statements in our code base as such:

var number = 1;
var evenness = number switch 
{ 
    1 => "odd", 
    2 => "even", 
    3 => "odd", 
    4 => "even",
    _=>"out of range" 
};

And I freaking love it! It's really nice, clean and succinct.

However, this could be improved with the following old style switch statement from this question Multiple cases in switch statement

string eventness2;
switch (number)
{
    case 1: case 3:
        eventness2 = "odd";
        break;
    case 2: case 4:
        eventness2 = "event";
        break;
    default:
        eventness2 = "out of range";
        break;
}

My question is, is there any way to support multiple cases within a one line switch statement similar to this invalid syntax

var evenness = number switch { 1,3 => "odd", 2,4 => "even",_=>"out of range";

score 3 · Answer 1 · answered Sep 15 '21 at 17:22

3

Of course, using pattern matching:

var evenness = number switch { 1 or 3 => "odd", 2 or 4 => "even", _ => "out of range" };

answered Sep 15 '21 at 17:22

Blindy

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Also, stack overflow innappropriately flagged my question as the same as the very question I referenced in the body. How stupid – apinostomberry Sep 15 '21 at 17:35
@apinostomberry agree that's not helpful; a User must've done that. I think if you' had commented over there asking for the ternary version, you'd be prompted to ask your own question. – JoeBrockhaus Mar 09 '22 at 16:11
Thanks for the insight. SO is a wonderland – apinostomberry Mar 10 '22 at 17:41

C# switch case one line with fallthrough

1 Answers1