使用 Visual Studio 2017 生成 C# .NET Core Hello World 應用程式：https://docs.microsoft.com/zh-cn/dotnet/core/tutorials/with-visual-studio

using System;

namespace HelloWorld
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("\nWhat is your name");
            var name = Console.ReadLine();
            var date = DateTime.Now;
            Console.WriteLine($"\nHello,{name},on {date:d} at {date:t}!"); 
            Console.WriteLine("Hello, {0}! Today is {1}, it's {2:HH:mm} now.", name, date.DayOfWeek, date);
            Console.WriteLine($"Hello, {name}! Today is {date.DayOfWeek}, it's {date:HH:mm} now.");
            Console.Write("Press any key to continue...");
            Console.ReadKey(true);
        }
    }
}
 

1. ReadLine()後面需要加（），DateTime.Now後面不加。
2. 字串內插符,用於將{}內的內插字串解析為結果字串，$後面需緊跟",不然會編譯錯誤。比複合格式字串更為直觀。
3. {date:HH:mm} 將date的值設定為HH:mm格式