69 lines
2.1 KiB
C#
69 lines
2.1 KiB
C#
//----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//----------------------------------------------------------------------------
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namespace System.Runtime
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{
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using System.Security;
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using System.Runtime.Interop;
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static class Ticks
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{
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public static long Now
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{
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[Fx.Tag.SecurityNote(Miscellaneous = "Why isn't the SuppressUnmanagedCodeSecurity attribute working in this case?")]
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[SecuritySafeCritical]
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get
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{
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long time;
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#pragma warning disable 1634
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#pragma warning suppress 56523 // function has no error return value
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#pragma warning restore 1634
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UnsafeNativeMethods.GetSystemTimeAsFileTime(out time);
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return time;
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}
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}
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public static long FromMilliseconds(int milliseconds)
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{
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return checked((long)milliseconds * TimeSpan.TicksPerMillisecond);
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}
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public static int ToMilliseconds(long ticks)
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{
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return checked((int)(ticks / TimeSpan.TicksPerMillisecond));
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}
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public static long FromTimeSpan(TimeSpan duration)
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{
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return duration.Ticks;
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}
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public static TimeSpan ToTimeSpan(long ticks)
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{
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return new TimeSpan(ticks);
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}
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public static long Add(long firstTicks, long secondTicks)
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{
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if (firstTicks == long.MaxValue || firstTicks == long.MinValue)
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{
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return firstTicks;
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}
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if (secondTicks == long.MaxValue || secondTicks == long.MinValue)
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{
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return secondTicks;
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}
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if (firstTicks >= 0 && long.MaxValue - firstTicks <= secondTicks)
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{
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return long.MaxValue - 1;
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}
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if (firstTicks <= 0 && long.MinValue - firstTicks >= secondTicks)
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{
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return long.MinValue + 1;
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}
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return checked(firstTicks + secondTicks);
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}
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}
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}
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