C# DateTime.Add()用法及代码示例

此方法用于返回一个新的DateTime，它将指定的TimeSpan的值添加到此实例的值。

用法:

public DateTime Add (TimeSpan value);

此处，值是正或负时间间隔。

返回值：此方法返回一个对象，其值是此实例表示的日期和时间与value表示的时间间隔之和。

异常：如果生成的DateTime小于MinValue或大于MaxValue，则此方法将提供ArgumentOutOfRangeException。

以下示例程序旨在说明DateTime.Add(TimeSpan)方法的用法：

示例1:

// C# program to demonstrate the 
// DateTime.Add(TimeSpan) 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); 
  
            // creating object of TimeSpan 
            TimeSpan duration = new TimeSpan(36, 0, 0, 0); 
  
            // adding the TimeSpan of 36 days 
            // using Add() method; 
            DateTime date2 = date1.Add(duration); 
  
            // 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); 
        } 
    } 
}

输出：

DateTime before operation: 2010 January 01

DateTime after operation: 2010 February 06

示例2:对于ArgumentOutOfRangeException

// C# program to demonstrate the 
// DateTime.Add(TimeSpan) 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.MinValue; 
  
            // Display the date1 
            Console.WriteLine("DateTime before "+ 
               "operation: {0:y} {0:dd}", date1); 
  
            // creating object of TimeSpan 
            TimeSpan duration = new TimeSpan(-36, 0, 0, 0); 
  
            // adding the TimeSpan of 36 days 
            // using Add() method; 
            DateTime date2 = date1.Add(duration); 
  
            // Display the date2 
            Console.WriteLine("\nDateTime after"+ 
              " operation: {0:y} {0:dd}", date2); 
        } 
  
        catch (ArgumentOutOfRangeException e) 
       { 
            Console.WriteLine("\nThe resulting DateTime"+ 
                          " is less than the MinValue "); 
            Console.Write("Exception Thrown: "); 
            Console.Write("{0}", e.GetType(), e.Message); 
        } 
    } 
}

输出：

DateTime before operation: 0001 January 01

The resulting DateTime is less than the MinValue 
Exception Thrown: System.ArgumentOutOfRangeException

注意：

执行日期算术时，Add方法考虑leap年和一个月中的天数。
此方法不会更改此DateTime的值。而是返回一个新的DateTime，其值是此操作的结果。

参考：

https://docs.microsoft.com/en-us/dotnet/api/system.datetime.add?view=netframework-4.7.2

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 DateTime.Add() Method in C#。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。