switch expression c#
var switchValue = 3;
var resultText = switchValue switch
{
1 or 2 or 3 => "one, two, or three",
4 => "four",
5 => "five",
_ => "unknown",
};switch expression c#
var switchValue = 3;
var resultText = switchValue switch
{
1 or 2 or 3 => "one, two, or three",
4 => "four",
5 => "five",
_ => "unknown",
};c# 8 switch
public static RGBColor FromRainbow(Rainbow colorBand) =>
colorBand switch
{
Rainbow.Red => new RGBColor(0xFF, 0x00, 0x00),
Rainbow.Orange => new RGBColor(0xFF, 0x7F, 0x00),
Rainbow.Yellow => new RGBColor(0xFF, 0xFF, 0x00),
Rainbow.Green => new RGBColor(0x00, 0xFF, 0x00),
Rainbow.Blue => new RGBColor(0x00, 0x00, 0xFF),
Rainbow.Indigo => new RGBColor(0x4B, 0x00, 0x82),
Rainbow.Violet => new RGBColor(0x94, 0x00, 0xD3),
_ => throw new ArgumentException(message: "invalid enum value", paramName: nameof(colorBand)),
};new in c# switch expression
public static T ExhaustiveExample<T>(IEnumerable<T> sequence) =>
sequence switch
{
System.Array { Length : 0} => default(T),
System.Array { Length : 1} array => (T)array.GetValue(0),
System.Array { Length : 2} array => (T)array.GetValue(1),
System.Array array => (T)array.GetValue(2),
IEnumerable<T> list
when !list.Any() => default(T),
IEnumerable<T> list
when list.Count() < 3 => list.Last(),
IList<T> list => list[2],
null => throw new ArgumentNullException(nameof(sequence)),
_ => sequence.Skip(2).First(),
};c# 8 switch
public static RGBColor FromRainbow(Rainbow colorBand) =>
colorBand switch
{
Rainbow.Red => new RGBColor(0xFF, 0x00, 0x00),
Rainbow.Orange => new RGBColor(0xFF, 0x7F, 0x00),
Rainbow.Yellow => new RGBColor(0xFF, 0xFF, 0x00),
Rainbow.Green => new RGBColor(0x00, 0xFF, 0x00),
Rainbow.Blue => new RGBColor(0x00, 0x00, 0xFF),
Rainbow.Indigo => new RGBColor(0x4B, 0x00, 0x82),
Rainbow.Violet => new RGBColor(0x94, 0x00, 0xD3),
_ => throw new ArgumentException(message: "invalid enum value", paramName: nameof(colorBand)),
};
public enum Rainbow
{
Red,
Orange,
Yellow,
Green,
Blue,
Indigo,
Violet
}Copyright © 2021 Codeinu
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