Question

What is the most terse syntax to combine a check for some preconditions with a switch statement? Can I combine an if/else and switch statement?

if (!IsValid(text))
{
   DoSomeLogging();
}
else
{
   switch (text)
   {
     case "1":
        DoSomething();
        break;
     case "2"
        DoSomethingElse();
        break;
     default:
        break;
   }
}

Edit: Removed skip comment. I wasn’t looking to invert the statement.

Answer 1

The “combined” else switch is nothing new:

if (!IsValid(text))
{
    DoSomeLogging();
}
else switch (text)
{
}

is the same as

if (!IsValid(text))
{
    DoSomeLogging();
}
else 
{
    switch (text)
    {
    }
}

This syntax has been inherited from C via C++.