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一：@

static void Main(string[] args)        {
           //这样就很方便写读取的文件路径，也不需要什么转义字符了	         StreamReader sr = new StreamReader(@"C:\Users\WANGWI8\Desktop\testStreamRead.txt");	         string line;	         while( (line = sr.ReadLine()) != null )	         {
   	             Console.WriteLine(line);	         }         }

二：$

static void Main(string[] args)        {
               var name = Console.ReadLine();            var date = DateTime.Now;            var result = $"hello {name} , you are my father , i am your son , writed at {date}";            Console.WriteLine(result);            var item2 =            (                name: "william",                sex: 'f'            );            Console.WriteLine($"this is item : item.name : {item2.name} , this is sex : {item2.sex}");            var inventory = new Dictionary
   
    ()            {
                   ["hammer, ball pein"] = 18,                ["hammer, cross pein"] = 5,                ["screwdriver, Phillips #2"] = 14            };            Console.WriteLine($"inventory on {DateTime.Now:d}");            Console.WriteLine(" ");            //负号的意思是左对齐，一共占据25个字符的空间            Console.WriteLine($"|{"item",-25}|{"quantity",10}|");            foreach (var item in inventory)                Console.WriteLine($"|{item.Key,-25}|{item.Value,10}|");        }
   

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