C#根据时间产生有序的GUID编码

最新推荐文章于 2025-02-06 20:00:00 发布

转载最新推荐文章于 2025-02-06 20:00:00 发布 · 1.1k 阅读

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#c#

本文介绍了一种基于当前时间和日期的GUID生成方法。通过将当前日期和时间戳转换为字节数组，并将其嵌入到GUID中，可以创建具有唯一性的GUID。此方法利用了.NET平台提供的类型转换和数组操作。

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public static Guid GenerateGuid()
{
    byte[] guidArray = Guid.NewGuid().ToByteArray();

    var baseDate = new DateTime(1900, 1, 1);
    DateTime now = DateTime.Now;
    var days = new TimeSpan(now.Ticks - baseDate.Ticks);
    TimeSpan msecs = now.TimeOfDay;

    byte[] daysArray = BitConverter.GetBytes(days.Days);
    byte[] msecsArray = BitConverter.GetBytes((long)(msecs.TotalMilliseconds / 3.333333));

    Array.Reverse(daysArray);
    Array.Reverse(msecsArray);

    Array.Copy(daysArray,daysArray.Length - 2,guidArray,guidArray.Length - 6,2);
    Array.Copy(msecsArray,msecsArray.Length - 4,guidArray,guidArray.Length - 4,4);

    return new Guid(guidArray);
}

public static Guid GenerateGuid()
{
    byte[] guidArray = Guid.NewGuid().ToByteArray();
 
    var baseDate = new DateTime(1900, 1, 1);
    DateTime now = DateTime.Now;
    var days = new TimeSpan(now.Ticks - baseDate.Ticks);
    TimeSpan msecs = now.TimeOfDay;
 
    byte[] daysArray = BitConverter.GetBytes(days.Days);
    byte[] msecsArray = BitConverter.GetBytes((long)(msecs.TotalMilliseconds / 3.333333));
 
    Array.Reverse(daysArray);
    Array.Reverse(msecsArray);
 
    Array.Copy(daysArray,daysArray.Length - 2,guidArray,guidArray.Length - 6,2);
    Array.Copy(msecsArray,msecsArray.Length - 4,guidArray,guidArray.Length - 4,4);
 
    return new Guid(guidArray);
}