/// <summary>
/// Initialises a new instance of the <see cref="TimeTrace"/> class using a specified timer.
/// </summary>
/// <param name="timer">Timer to use for measurements.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="timer"/> is null.</exception>
public TimeTrace(ITraceTimer timer)
{
// Make sure that any exceptions are thrown *before* overwriting any AsyncLocal<T> values.
_timer = timer ?? throw new ArgumentNullException(nameof(timer));
_previous = _current.Value;
_current.Value = this;
_timer.Start();
}
/// <summary>
/// Initialises a new instance of the <see cref="TraceScope"/> class.
/// </summary>
/// <param name="trace">Trace that the scope belongs to.</param>
/// <param name="name">Name of the scope.</param>
public TraceScope(TimeTrace trace, string name)
{
_name = name;
_startNs = trace._timer.ElapsedNanoseconds;
_trace = trace;
Parent = trace._currentScope.Value;
trace._currentScope.Value = this;
trace.OnScopeCreated(this);
}