Pattern matching in C# has been significantly enhanced in recent versions, providing more expressive and concise ways to perform data queries. You can use switch expressions to simplify complex conditional logic. Further extended pattern-matching capabilities, allowing for more patterns like relational, logical, and parenthesized patterns.
Here's an example that demonstrates the use of various pattern-matching enhancements:
public class WeatherForecast
{
public decimal TemperatureCelsius { get; init; }
public string Summary { get; init; }
}
public static string GetForecastMessage(WeatherForecast forecast) =>
forecast switch
{
// Relational pattern
{ TemperatureCelsius: >= 30.0m } => "Stay cool, it's hot out there!",
// Logical pattern
{ TemperatureCelsius: < 0 and >= -10 } => "It's cold, but manageable.",
// Combination of property and relational patterns
{ TemperatureCelsius: < -10, Summary: "Snowing" } => "Bundle up, heavy snow!",
// Parenthesized pattern
{ TemperatureCelsius: (< 20 and > 10) } => "It's a nice day with moderate temperature.",
// Discard pattern
_ => "Weather is unpredictable."
};
public static void Main(string[] args)
{
var forecast = new WeatherForecast { TemperatureCelsius = 25.0m, Summary = "Sunny" };
Console.WriteLine(GetForecastMessage(forecast));
}
Use pattern matching to write more readable and maintainable conditional logic. It reduces the amount of code and increases clarity compared to traditional if-else statements.
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