C# Source Code: High Performance Timer
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C# Source Code
High Performance Timer
By:
Andrew Baker
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Date:
Tuesday, June 29, 2010
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2305
Category:
General/Framework
Article:
Below is a sample class containing a high performance timer: Example usuage: PerformanceTimer pf = new PerformanceTimer(true); float timeMs = pf.GetTimeMs(); using System; using System.Runtime.InteropServices; /// <summary> /// This class can be used to gather accurate performance timings. /// </summary> public class PerformanceTimer { [DllImport("kernel32.dll")] internal static extern bool QueryPerformanceCounter(ref long lpPerformanceCount); [DllImport("kernel32.dll")] internal static extern bool QueryPerformanceFrequency(ref long lpFrequency); #region Private Variables private bool _isRunning = false; private long _startTime = 0; private long _frequency = 0; private float _elapsed = 0; #endregion Private Variables #region Constructors /// <summary> /// Default constructor - does not start timer immediately. /// </summary> public PerformanceTimer() { } /// <summary> /// Constructor with option to start timer at same time. /// </summary> /// <param name="startTimer">Whether to start timer immediately.</param> public PerformanceTimer(bool startTimer) { if ( startTimer ) { Start(); } } #endregion Constructors #region Public Properties /// <summary> /// Returns True if the timer is currently running. /// </summary> /// <remarks>To change the running state use the Start and Stop methods provided.</remarks> public bool IsRunning { get{return _isRunning;} } #endregion Public Properties #region Public Methods /// <summary> /// Starts the performance timer running. /// </summary> public void Start() { QueryPerformanceFrequency(ref _frequency); QueryPerformanceCounter(ref _startTime); _elapsed = 0; _isRunning = true; } /// <summary> /// Stops the performance timer running. /// </summary> public void Stop() { // Call procedure that will set internal elapsed variable, then turn running flag off. GetTime(); _isRunning = false; } /// <summary> /// Returns the time elapsed since "Start" was called (in seconds). If the timer /// is not running the time elapsed between the last start and stop time is returned. /// </summary> /// <returns>A float representing the time ellapsed (in seconds)</returns> public float GetTime() { if (_isRunning) { long endTime = 0; QueryPerformanceCounter(ref endTime); _elapsed = (float)(endTime - _startTime) / _frequency; return _elapsed; } else { return _elapsed; } } /// <summary> /// Returns the time elapsed since "Start" was called (in milliseconds). If the timer /// is not running the time elapsed between the last start and stop time is returned. /// </summary> /// <returns>A float representing the time ellapsed (in milliseconds)</returns> public float GetTimeMs() { if (_isRunning) { return GetTime()*1000; } else { return _elapsed*1000; } } /// <summary> /// Override ToString to display time nicely formatted. /// </summary> /// <returns>Returns the time formatted as a string.</returns> public override string ToString() { return String.Format("{0:0000.000}s ", GetTime()); } #endregion Public Methods }
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