C#中的DateTime.CompareTo()方法
C#中的DateTime.CompareTo()方法用于将该实例的值与指定的DateTime值进行比较。
语法
以下是语法-
public int CompareTo (DateTime val);
上面的Val是要比较的日期。
它返回一个整数值，
<0-如果此实例早于Val
0-如果此实例与Val相同
>0-如果此实例晚于Val
示例
现在让我们看一个实现DateTime.CompareTo()方法的示例-
using System;
public class Demo {
public static void Main(){
DateTime date1 = new DateTime(2019, 05, 20, 6, 20, 40);
DateTime date2 = new DateTime(2019, 05, 20, 6, 20, 40);
Console.WriteLine("DateTime 1 = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", date1);
Console.WriteLine("DateTime 2 = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", date2);
int res = date1.CompareTo(date2);
//返回0
Console.WriteLine(res);
}
}输出结果
这将产生以下输出-
DateTime 1 = 20 November 2019, 06:20:40 DateTime 2 = 20 November 2019, 06:20:40 0
示例
现在让我们来看另一个实现DateTime.CompareTo()方法的示例-
using System;
public class Demo {
public static void Main(){
DateTime date1 = new DateTime(2019, 08, 20, 6, 20, 40);
DateTime date2 = new DateTime(2019, 05, 20, 6, 20, 40);
Console.WriteLine("DateTime 1 = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", date1);
Console.WriteLine("DateTime 2 = {0:dd} {0:y}, {0:hh}:{0:mm}:{0:ss} ", date2);
int res = date1.CompareTo(date2);
// returns >0 since date1 is later than date2
Console.WriteLine(res);
}
}输出结果
这将产生以下输出-
DateTime 1 = 20 August 2019, 06:20:40 DateTime 2 = 20 May 2019, 06:20:40 1