C# 字符串的格式化

说明

字符串的格式化指将字符串变更为某一格式,例如某一种日期格式

本文参考[C# 开发实战] 软件开发技术联盟编著

语法

• string S3= string.Format("Current Time is {0:d}",dt);

格式规范	说明
d	简短日期格式(YYYY-MM-DD)
D	完整日期格式(YYYY年MM月DD日)
t	简短时间格式(hh:mm)
T	完整时间格式(hh:mm:ss)
f	简短日期时间格式(YYYY年MM月DD日 hh:mm)
F	完整日期时间格式(YYYY年MM月DD日 hh:mm:ss)
g	简短可排序日期时间格式(YYYY年MM月DD日 hh:mm)
G	简短可排序日期时间格式(YYYY年MM月DD日 hh:mm:ss)
M或m	月/日 (MM月dd日)
Y或y	年/月 (YYYY年/MM月)

实例

按指定格式输出当前时间

using System;

namespace CsharpCode
{
    class Program
    {
        static void Main(string[] args)
        {


            DateTime dt = DateTime.Now;
            string S3= string.Format("Current Time is {0:d}",dt);
            string S4= string.Format("Current Time is {0:D}",dt);
            string S5= string.Format("Current Time is {0:t}",dt);
            string S6= string.Format("Current Time is {0:T}",dt);
            string S7= string.Format("Current Time is {0:f}",dt);
            string S8= string.Format("Current Time is {0:F}",dt);
            string S9= string.Format("Current Time is {0:g}",dt);
            string S10= string.Format("Current Time is {0:G}",dt);
            string S11= string.Format("Current Time is {0:m}",dt);
            string S12= string.Format("Current Time is {0:y}",dt);

            Console.WriteLine(S3+"\n"+S4+"\n"+S5+"\n"+S6+"\n"+S7+"\n"+S8+"\n"+S9+"\n"+S10+"\n"+S11+"\n"+S12);

        }
    }
}

输出

Current Time is 10/13/2018
Current Time is Saturday, October 13, 2018
Current Time is 3:39 PM
Current Time is 3:39:21 PM
Current Time is Saturday, October 13, 2018 3:39 PM
Current Time is Saturday, October 13, 2018 3:39:21 PM
Current Time is 10/13/2018 3:39 PM
Current Time is 10/13/2018 3:39:21 PM
Current Time is October 13
Current Time is October, 2018