Measuring Speed With Anonymous Functions

/// <summary>
/// Simple measuring of sections of code
/// </summary>
public class CodeBlockTimer {

    #region Private Fields

    //holds the current time for this measurement
    private Stopwatch _OverallTime;

    //container for the measured code sections
    private List<object> _Blocks = new List<object>();

    //the nested level for the code block
    private int _Level = 0;

    #endregion

    #region Methods

    /// <summary>
    /// Stops this code block timer
    /// </summary>
    public void Stop() {
        this._OverallTime.Stop();
    }

    /// <summary>
    /// Adds a block of code to measure
    /// </summary>
    public void Measure(Action block) {
        this.Measure(block.Method.Name, block);
    }

    /// <summary>
    /// Adds a block of code to measure with a defined name
    /// </summary>
    public void Measure(string identity, Action block) {

        //start the overall timer if needed
        if (this._OverallTime == null) {
            this._OverallTime = Stopwatch.StartNew();
        }
        //check and make sure this timer wasn't already stopped
        else if (!this._OverallTime.IsRunning) {
            throw new InvalidOperationException(
                "This CodeBlockTimer has already been stopped" +
        "and cannot measure additional code blocks."
                );
        }

        //create the container
        _StartBlock start = new _StartBlock(identity, this._Level++);
        _EndBlock end = new _EndBlock(start);

        //run this section of code
        this._Blocks.Add(start);
        start.Timer = Stopwatch.StartNew();
        block();
        start.Timer.Stop();
        this._Blocks.Add(end);

        //and revert the level
        this._Level--;

    }

    /// <summary>
    /// Writes the results to the Console
    /// </summary>
    public void ToConsole() {

        //make sure all of the jobs have finished
        if (this._Level > 0) {
            throw new InvalidOperationException(
                "Cannot report the final summary until all" +
        "code blocks have completed."
                );
        }

        //stop the overall timer
        if (this._OverallTime.IsRunning) {
            this._OverallTime.Stop();
        }

        //showing code groups
        Func<int, string> treeLine = (count) => {
            string start = string.Empty;
            for (var i = 0; i < count; i++) {
                start = string.Concat(start, "|  ");
            }
            return start;
        };

        //display each code block
        foreach (object item in this._Blocks) {

            //if this is a starting block, show the work has started
            if (item is _StartBlock) {
                _StartBlock block = item as _StartBlock;
                Console.WriteLine(
                    "{0}[Begin] {1}: {2}",
                    treeLine(block.Level),
                    block.Identity,
                    block.Level
                    );
            }
            //if this is the closing block, display the timer result
            else if (item is _EndBlock) {
                _EndBlock block = item as _EndBlock;
                Console.WriteLine(
                    "{0}[End] {1}: {2} ({3})",
                    treeLine(block.StartingBlock.Level),
                    block.StartingBlock.Identity,
                    block.StartingBlock.Level,
                    block.StartingBlock.ToTimeString()
                    );
            }

        }

        //and display the summary
        Console.WriteLine(
            "\nTotal Blocks: {0}\nTotal Time: {1}", 
            this._Blocks.Where(item => item is _StartBlock).Count(),
            CodeBlockTimer._ToTimeString(this._OverallTime.ElapsedMilliseconds)
            );
    }

    #endregion

    #region Static Methods

    //creates a meaningful time string from some milliseconds
    private static string _ToTimeString(long ms) {
        if (ms > 60000) {
            return string.Format("{0:0.0}min", (double)ms / 60000d);
        }
        else if (ms > 1000) {
            return string.Format("{0:0.0}sec", (double)ms / 1000d);
        }
        else {
            return string.Format("{0}ms", ms);
        }
    }

    #endregion

    #region Timing Classes

    //the marker for the start of a code block
    private class _StartBlock {

        //starts a new block to check the starting time
        public _StartBlock(string identity, int level) {
            this.Identity = identity;
            this.Level = level;
        }

        //the identifying name for this code block
        public string Identity { get; private set; }

        //the level this starts at
        public int Level { get; private set; }

        //the timer for this code block
        public Stopwatch Timer { get; set; }

        //provides a meaningful time value
        public string ToTimeString() {
            return CodeBlockTimer._ToTimeString(this.Timer.ElapsedMilliseconds);
        }
    }

    //marker for the finishing of a code block
    private class _EndBlock {

        //starts a new block to check the ending time time
        public _EndBlock(_StartBlock start) {
            this.StartingBlock = start;
        }

        //the open block this code was started in
        public _StartBlock StartingBlock { get; private set; }
    }

    #endregion

}

//create a monitor
CodeBlockTimer monitor = new CodeBlockTimer();

//start measuring a block
monitor.Measure("First Method", () => {

    //simulate execution time
    Thread.Sleep(300);

    //measure a block without an identity
    monitor.Measure(() => {
        Thread.Sleep(500);

        //measure a defined method
        monitor.Measure(DoSomething);
    });

    //provide an identity for an anonymoure method
    monitor.Measure("Quick Call", () => {
        Thread.Sleep(250);
    });

    //more simulated execution time
    Thread.Sleep(300);

});

//stop measuring the timer (or simply call ToConsole())
monitor.Stop();

//Display the results of the method to the console
monitor.ToConsole();

[Begin] First Method: 0
|  [Begin] <Main>b__1: 1
|  |  [Begin] DoSomething: 2
|  |  [End] DoSomething: 2 (1000ms)
|  [End] <Main>b__1: 1 (1.5sec)
|  [Begin] Quick Call: 1
|  [End] Quick Call: 1 (250ms)
[End] First Method: 0 (2.4sec)

Blocks: 4,  Total Time: 2.4sec