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  • Property pattern in C#8 with keyword switch ,Enum pattern via switch

    static void PropertyPatternDemo()
            {
                string url = "https://devblogs.microsoft.com/dotnet/do-more-with-patterns-in-c-8-0/";
                bool result = ShouldAllow(new Uri(url));
                Console.WriteLine(result);
            }
    
           static bool ShouldAllow(Uri uri) => uri switch
            {
                { Scheme: "http", Port: 80,Host:var host} => host.Length<1000,
                { Scheme: "https", Port: 443 } => true,
                { Scheme: "ftp", Port: 21 } => true,
                { IsLoopback: true } => true,
                _ => false
            };
    enum Seasons { Spring,Summer,Fall,Winter};
    
    static void EnumPatternDemo()
            {
                int tp = AverageTemp(Seasons.Spring, false);
                Console.WriteLine(tp);
            }
    
            static int AverageTemp(Seasons sea, bool dayTime) => (sea, dayTime) switch
            {
                (Seasons.Spring, true) => 20,
                (Seasons.Spring, false) => 16,
                (Seasons.Summer, true) => 27,
                (Seasons.Summer, false) => 22,
                (Seasons.Fall, true) => 18,
                (Seasons.Fall, false) => 12,
                (Seasons.Winter, true) => 10,
                (Seasons.Winter, false) => -2,
                _ => throw new Exception("Unexpected combination")
            };
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  • 原文地址:https://www.cnblogs.com/Fred1987/p/14473425.html
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