Evaluate Expressions in Switch Statements in C#

Question

I have to implement the following in a switch statement:

switch(num)
{
  case 4:
    // some code ;
    break;
  case 3:
    // some code ;
    brea         


        

Answer 1

I've run into the following pattern recently, and while I abhor it, I can't argue that it's not practical:

switch(0)
{
  case 0 when x < 0:
    ...
    break;
  case 0 when a > 5 && x == 0:
    ...
    break;
}

The use of dummy expressions ((0) in the switch, and case 0) is absolutely terrible, and I'd hate for it to become an idiom, but hey - it's concise and very clear. For sure it's not some hack that completely obscures the meaning and needs arcane knowledge, but C# would do well to obviate the need for it. I'd like the following to be legal:

switch                   // maybe () here, if the grammar would demand
{
  case when x < 0:       // I like the case to stay
    ...
  case when a > 5 && x == 0:
    ...
}