Switch case: can I use a range instead of a one number [duplicate]

Original Answer for C# 7

A bit late to the game for this question, but in recent changes introduced in C# 7 (Available by default in Visual Studio 2017/.NET Framework 4.6.2), range-based switching is now possible with the switch statement.

Example:

int i = 63;

switch (i)
{
    case int n when (n >= 100):
        Console.WriteLine($"I am 100 or above: {n}");
        break;

    case int n when (n < 100 && n >= 50 ):
        Console.WriteLine($"I am between 99 and 50: {n}");
        break;

    case int n when (n < 50):
        Console.WriteLine($"I am less than 50: {n}");
        break;
}

Notes:

• The parentheses ( and ) are not required in the when condition, but are used in this example to highlight the comparison(s).
• var may also be used in lieu of int. For example: case var n when n >= 100:.

---

Updated examples for C# 9

switch(myValue)
{
    case <= 0:
        Console.WriteLine("Less than or equal to 0");
        break;
    case > 0 and <= 10:
        Console.WriteLine("More than 0 but less than or equal to 10");
        break;
    default:
        Console.WriteLine("More than 10");
        break;
}

or

var message = myValue switch
{
    <= 0 => "Less than or equal to 0",
    > 0 and <= 10 => "More than 0 but less than or equal to 10",
    _ => "More than 10"
};
Console.WriteLine(message);