此方法用于返回一个新的DateTimeOffset对象，该对象将一个指定的时间间隔添加到此实例的值。
Syntax: public DateTimeOffset Add (TimeSpan timeSpan);
Here, it takes a TimeSpan object that represents a positive or a negative time interval.
Return Value: This method returns an object whose value is the sum of the date and time represented by the current DateTimeOffset object and the time interval represented by timeSpan.
Exception: This methdod will give ArgumentOutOfRangeException if The resulting DateTimeOffset value is less than MinValue or the resulting DateTimeOffset value is greater than MaxValue.
下面的程序说明了DateTimeOffset.Add(TimeSpan)方法的用法：
范例1：
// C# program to demonstrate the
// DateTimeOffset.Add(TimeSpan)
// Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// creating object of DateTimeOffset
DateTimeOffset offset = new DateTimeOffset(2007,
6, 1, 7, 55, 0, new TimeSpan(-5, 0, 0));
// creating object of TimeSpan
TimeSpan elapsedTime = new TimeSpan(10, 0, 0);
// adding a specified time interval
// to the value of this instance.
// using Add() method;
DateTimeOffset value = offset.Add(elapsedTime);
// Display the time
Console.WriteLine("DateTimeOffset is {0}", value);
}
catch (ArgumentOutOfRangeException e)
{
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
}
输出：
DateTimeOffset is 06/01/2007 17:55:00 -05:00
示例2：对于ArgumentOutOfRangeException
// C# program to demonstrate the
// DateTimeOffset.Add(TimeSpan)
// Method
using System;
using System.Globalization;
class GFG {
// Main Method
public static void Main()
{
try {
// creating object of DateTimeOffset
DateTimeOffset offset = DateTimeOffset.MaxValue;
// creating object of TimeSpan
TimeSpan elapsedTime = new TimeSpan(10, 0, 0);
// adding a specified time interval
// to the value of this instance.
// using Add() method;
DateTimeOffset value = offset.Add(elapsedTime);
// Display the time
Console.WriteLine("DateTimeOffset is {0}", value);
}
catch (ArgumentOutOfRangeException e)
{
Console.Write("Exception Thrown: ");
Console.Write("{0}", e.GetType(), e.Message);
}
}
}
输出：
Exception Thrown: System.ArgumentOutOfRangeException
参考：
- https://docs.microsoft.com/zh-cn/dotnet/api/system.datetimeoffset.add?view=netframework-4.7.2