FILETIME 互转 DateTime 待验证

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本文提供了一段实用的C#代码示例，演示了如何将System.DateTime类型转换为System.Runtime.InteropServices.FILETIME类型，并反过来进行转换。这对于处理.NET环境中Win32 API返回的FILETIME结构非常有用。

http://blog.163.com/mingwang_ok/blog/static/18436570200773075452554/

HOW TO: convert a System.Runtime.InteropServices.FILETIME into a System.DateTime and back again

Added On: 12/14/2003

Blurb

Eventually, everyone works with an unmanaged Win32 API in .NET that returns you information in the form of a FILETIME struct. But, a .NET programmer is used to working with a DateTime struct. This code converts FILETIME to DateTime and DateTime to FILETIME... just everything a growing programmer needs.

Sample C# Code

using System;
using System.Runtime.InteropServices;

namespace ClassLibrary3
{
    class __Loader
    {
        // HOWTO: convert a System.Runtime.InteropServices.FILETIME 
        //        into a System.DateTime and back again

        static void Main()
        {
            FILETIME ft = new FILETIME();

            /////////////////////////////////////////////////////////////////
            //from System.DateTime to System.Runtime.InteropServices.FILETIME
            /////////////////////////////////////////////////////////////////
            long hFT1 = DateTime.Now.ToFileTimeUtc();
            ft.dwLowDateTime = (int) (hFT1 & 0xFFFFFFFF);
            ft.dwHighDateTime = (int) (hFT1 >> 32);

            /////////////////////////////////////////////////////////////////
            //from System.Runtime.InteropServices.FILETIME to System.DateTime
            /////////////////////////////////////////////////////////////////
            long hFT2 = (((long) ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
            DateTime dte = DateTime.FromFileTimeUtc(hFT2);

            Console.WriteLine(dte);
        }
    }
}