日期时间。C# 中的 AddDays()方法

原文:https://www . geesforgeks . org/datetime-adddays-method-in-c-sharp/

此方法用于返回一个新的日期时间，该日期时间将指定的天数添加到此实例的值中。

语法:

public DateTime AddDays (double value);

这里值是整数和小数的天数。值参数可以是负数或正数。

返回值:该方法返回一个对象，该对象的值是该实例表示的日期和时间与值表示的天数之和。

异常:如果生成的日期时间小于最小值或大于最大值，此方法将给出argumentout of range Exception。

以下程序说明了日期时间的使用。添加天数(双倍)方法:

例 1:

// C# program to demonstrate the
// DateTime.AddDays(Double) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // creating object of DateTime
            DateTime date1 = new DateTime(2010, 1, 1,
                                           8, 0, 15);

            // adding the 36 days
            // using AddDays() method;
            DateTime date2 = date1.AddDays(36);

            // Display the date1
            System.Console.WriteLine("DateTime before "+
                      "operation: {0:y} {0:dd}", date1);

            // Display the date2
            System.Console.WriteLine("\nDateTime after"+
                     " operation: {0:y} {0:dd}", date2);
        }

        catch (ArgumentOutOfRangeException e) 
        {
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

DateTime before operation: 2010 January 01

DateTime after operation: 2010 February 06

例 2: 为argumentout of range exception

// C# program to demonstrate the
// DateTime.AddDays(Double) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // creating object of DateTime and
            // initialize with MinValue
            DateTime date1 = DateTime.MaxValue;

            // Display the date1
            Console.WriteLine("DateTime before "+
               "operation: {0:y} {0:dd}", date1);

            // adding the TimeSpan of 36 days
            // using Add() method;
            System.DateTime date2 = date1.AddDays(36);

            // Display the date2
            System.Console.WriteLine("\nDateTime after "+
                       "operation: {0:y} {0:dd}", date2);
        }

        catch (ArgumentOutOfRangeException e) 
        {
            Console.WriteLine("\nThe resulting DateTime is "+
                       "greater than the DateTime.MaxValue ");

            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

DateTime before operation: 9999 December 31

The resulting DateTime is greater than the DateTime.MaxValue 
Exception Thrown: System.ArgumentOutOfRangeException

注:

  • 此方法不更改此日期时间的值。相反，它返回一个新的日期时间，其值是此操作的结果。
  • 值的小数部分是一分钟的小数部分。例如，7.5 相当于 7 分钟、30 秒、0 毫秒和 0 刻度。
  • 值参数四舍五入到最接近的毫秒。

参考:

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