C＃中的DateTimeOffset.ToFileTime()方法

DateTimeOffset.ToFileTime方法用于将当前DateTimeOffset对象的值转换为Windows文件时间。

Syntax: public long ToFileTime ();

Return Value: This method returns the value of the current DateTimeOffset object, expressed as a Windows file time.

Exception: This method will give ArgumentOutOfRangeException if the resulting file time would represent a date and time before midnight on January 1, 1601 C.E. Coordinated Universal Time (UTC).

下面的程序说明了DateTimeOffset.ToFileTime()方法的用法：

范例1：

// C# program to demonstrate the
// DateTimeOffset.ToFileTime()
// 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));
  
            // Converts the value of the current
            // DateTimeOffset object to a Windows file time.
            // instance using ToFileTime() method
            long value = offset.ToFileTime();
  
            // Display the time
            Console.WriteLine("Windows file time is {0}", value);
        }
  
        catch (ArgumentOutOfRangeException e) 
        {
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

输出：

Windows file time is 128251761000000000

示例2：对于ArgumentOutOfRangeException

// C# program to demonstrate the
// DateTimeOffset.ToFileTime()
// Method
using System;
using System.Globalization;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        try {
  
            // creating object of  DateTimeOffset
            DateTimeOffset offset = new DateTimeOffset(1600,
                    6, 1, 7, 55, 0, new TimeSpan(-5, 0, 0));
  
            // Converts the value of the current
            // DateTimeOffset object to a Windows file time.
            // instance using ToFileTime() method
            long value = offset.ToFileTime();
  
            // Display the time
            Console.WriteLine("Windows file time 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.tofiletime?view=netframework-4.7.2