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34 lines
1.3 KiB
C#
34 lines
1.3 KiB
C#
using NpgsqlTypes;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Text;
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using System.Threading;
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public static class FreeUtil {
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private static DateTime dt1970 = new DateTime(1970, 1, 1);
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private static ThreadLocal<Random> rnd = new ThreadLocal<Random>();
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private static readonly int __staticMachine = ((0x00ffffff & Environment.MachineName.GetHashCode()) +
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#if NETSTANDARD1_5 || NETSTANDARD1_6
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1
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#else
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AppDomain.CurrentDomain.Id
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#endif
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) & 0x00ffffff;
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private static readonly int __staticPid = Process.GetCurrentProcess().Id;
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private static int __staticIncrement = rnd.Value.Next();
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/// <summary>
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/// 生成类似Mongodb的ObjectId有序、不重复Guid
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/// </summary>
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/// <returns></returns>
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public static Guid NewMongodbId() {
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var now = DateTime.Now;
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var uninxtime = (int)now.Subtract(dt1970).TotalSeconds;
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int increment = Interlocked.Increment(ref __staticIncrement) & 0x00ffffff;
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var rand = rnd.Value.Next(0, int.MaxValue);
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var guid = $"{uninxtime.ToString("x8").PadLeft(8, '0')}{__staticMachine.ToString("x8").PadLeft(8, '0').Substring(2, 6)}{__staticPid.ToString("x8").PadLeft(8, '0').Substring(6, 2)}{increment.ToString("x8").PadLeft(8, '0')}{rand.ToString("x8").PadLeft(8, '0')}";
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return Guid.Parse(guid);
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}
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} |