Support block expressions inside pattern matching

[oliverjanik]

Version Used: C# 8

At the moment the following is not possible:

        return list.Count switch
        {
            0 => null,
            1 => list[0],
            _ => {
                LogError();
                return null;
            }
        };

I get Invalid expression term '{'

The obvious workaround here is defining a quick little private function.

[333fred]

Duplicate of #3037.

[svick]

I think this is covered by the more general expression blocks proposal: #3086.

With that, your example would be:

return list.Count switch
{
    0 => null,
    1 => list[0],
    _ => {
        LogError();
        null
    }
};

[333fred]

It would be, yes, but this issue was specifically about switch expressions, unlike the general block expression proposal.