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

What you could do is to use a delegate like this.

        var actionSwitch = new Dictionary, Action>
        {
             { x => x < 0 ,     () => Log.Information("less than zero!")},
             { x => x == 1,     () => Log.Information("1")},
             { x => x == 2,     () => Log.Information("2")},
             { x => x == 3,     () => Log.Information("3")},
             { x => x == 4,     () => Log.Information("4")},
             { x => x == 5,     () => Log.Information("5")},
        };

        int numberToCheck = 1;

        //Used like this
        actionSwitch.FirstOrDefault(sw => sw.Key(numberToCheck)).Value();

Just swap out what you wan´t to perform where the Log.Information("x") is and you have your "switch" statement.

You will need to some error handling if you check for a key that is "found" by the Func.

If you like to see the Func version of the switch I just wrote a blog post with Switch example chapter.

But if you can use C# 7 it will give you better switch capabilities.