CSharp - Stack switch type pattern match by range and by type

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Introduction

The following code use switch to match value by range.

Console.WriteLine in the following code will execute for any floating-point type greater than 1000: 

switch (x)
{
   case float f when f > 1000:
   case double d when d > 1000:
   case decimal m when m > 1000:
         Console.WriteLine ("We can refer to x here but not f or d or m");
         break;
}

In Console.WriteLine statement, you would not know the type of x and which value is assigned.

You can mix and match constants and patterns in the same switch statement.

You can switch on the null value: 

case null:
       Console.WriteLine ("Nothing here");
       break;

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