C# DateTime类小练习-打印当前月的日历

C# DateTime类小练习-打印当前月的日历

• new DateTime(month, week, day) 构造函数。
• Today 静态属性，获取当前时间。
• Year 实例属性，获取年份。
• Month 实例属性，获取月份。
• DayOfWeek 实例属性，获取星期。
• AddMonths(int x) 实例方法，增加x月。
• AddDays(int x) 实例方法，增加x天。

using System;

class Test
{
    
    
    public static void Main()
    {
    
    
        const string s4 = "    ";
        int nYear = DateTime.Today.Year;
        int nMonth = DateTime.Today.Month;
        DateTime d1 = new DateTime(nYear, nMonth, 1);
        Console.WriteLine("{0}/{1}", d1.Year,d1.Month);
        Console.WriteLine("SUN MON TUE WED THU FRI SAT");
        int iWeek = (int)d1.DayOfWeek;
        int iLastDay = d1.AddMonths(1).AddDays(-1).Day;
        for (int i = 0; i < iWeek; i++) Console.Write(s4);
        for (int i = 1; i <= iLastDay; i++ )
        {
    
    
            Console.Write(" {0:00} ", i);
            if ((i + iWeek) % 7 == 0) Console.WriteLine(); 
        }
    }
}

打印2023一年的日历

using System;

class Test
{
    
    
    public static void Main()
    {
    
    
        var d = new DateTime(2023, 1, 1);
        var wk = "SUN MON TUE WED THU FRI SAT";
        for (int mon = 1; mon <= 12; mon++)
        {
    
    
            Console.WriteLine("2023/{0}", mon);
            Console.WriteLine(wk);
            int w = (int)d.DayOfWeek;
            for (int i = 0; i < w; i++)
                Console.Write("    ");
            int ld = d.AddMonths(1).AddDays(-1).Day;
            for (int i = d.Day; i <= ld; i++)
            {
    
    
                Console.Write($" {
      
      i:00} ");
                if ((i+w) % 7 == 0) Console.WriteLine();
            }
            Console.WriteLine();
            Console.WriteLine();
            d = d.AddMonths(1);
        }
    }
}