在开关模式匹配返回中使用 int 的值

Question

Seems to be something very simple I'm missing, but can't find any example of how to handle such case. I need to construct a switch statement like this (pseudocode):

a+b switch
{
   var sum: >0 => sum
};

I have a strong feeling that it should be possible for value types without using when, but I can't find syntax for this.

Answer 1

a + b switch
{
   > 0 => returnValue;
   _ => catchAll;
}

Answer 2

Made a ReSharper answer that for me eventually:)

So the syntax for it is:

a+b switch
{
   var sum and >0 => sum
};

It wasn't that obvious, hope it'll help someone