c# tuple 和 switch 搭配使用

Posted 2022-11-06 cyang812

搭配使用 tuple 和 switch

(string Str, char Separator) tuple = myEnum switch

	MyEnum.RED => (text, '-'),
	MyEnum.YELLOW => (text, '.'),
	MyEnum.GREEN => (text, '/'),
		
	_ => (text, 'u'),
;

测试代码

namespace Any

    public class TupleSwitch
    
        enum MyEnum
        
            RED,
            YELLOW,
            GREEN
        


        class Program
        
            static void Main(string[] args)
            
                MyEnum e1 = MyEnum.RED;
                String e1Str1 = "Red-01";
                String e1Str2 = "Red-02";

                MyEnum e2 = MyEnum.YELLOW;
                String e2Str1 = "Yellow.03";
                String e2Str2 = "Yellow.04";

                MyEnum e3 = MyEnum.GREEN;
                String e3Str1 = "Green/05";
                String e3Str2 = "Green/06";

                int idx = 0;

                if (ParseIndexFromString(e1, e1Str1, out idx))
                
                    Console.WriteLine($"idx = idx");
                

                if (ParseIndexFromString(e1, e1Str2, out idx))
                
                    Console.WriteLine($"idx = idx");
                

                if (ParseIndexFromString(e2, e2Str1, out idx))
                
                    Console.WriteLine($"idx = idx");
                

                if (ParseIndexFromString(e2, e2Str2, out idx))
                
                    Console.WriteLine($"idx = idx");
                

                if (ParseIndexFromString(e3, e3Str1, out idx))
                
                    Console.WriteLine($"idx = idx");
                

                if (ParseIndexFromString(e3, e3Str2, out idx))
                
                    Console.WriteLine($"idx = idx");
                
            

            public static bool ParseIndexFromString(MyEnum myEnum, string text, out int index)
            
                (string Str, char Separator) tuple = myEnum switch
                
                    MyEnum.RED => (text, '-'),
                    MyEnum.YELLOW => (text, '.'),
                    MyEnum.GREEN => (text, '/'),


                    _ => (text, 'u'),
                ;


                int pos = tuple.Str.IndexOf(tuple.Separator);
                string subStr = tuple.Str.Substring(pos + 1).Trim();                
                if (int.TryParse(subStr, out index))
                
                    return true;
                
                else
                
                    return false;