ValueStopwatch.cs

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using System;
using System.Diagnostics;
 
namespace Microsoft.Extensions.Internal;
 
internal struct ValueStopwatch
{
    private static readonly double TimestampToTicks = 10000000.0 / (double)Stopwatch.Frequency;
 
    private long _startTimestamp;
 
    public bool IsActive => _startTimestamp != 0;
 
    private ValueStopwatch(long startTimestamp)
    {
        _startTimestamp = startTimestamp;
    }
 
    public static ValueStopwatch StartNew()
    {
        return new ValueStopwatch(Stopwatch.GetTimestamp());
    }
 
    public TimeSpan GetElapsedTime()
    {
        if (!IsActive)
        {
            throw new InvalidOperationException("An uninitialized, or 'default', ValueStopwatch cannot be used to get elapsed time.");
        }
        long timestamp = Stopwatch.GetTimestamp();
        long num = timestamp - _startTimestamp;
        long ticks = (long)(TimestampToTicks * (double)num);
        return new TimeSpan(ticks);
    }
}