如何實現IEnumerable和IEnumerator接口，一個ASP.NET MVC日誌模型的實現

namespace MyMvcApp.Models
{
    public class LogsModel:IEnumerable<IDictionary<string,string>>,IEnumerator<IDictionary<string,string>>
    {
        private TextReader reader;

        private IDictionary<string, string> currentLog;

        private string logFileName { get; set; }

        public int LogCount { get; set; }

      
        public LogsModel(string logFileName = @"logs\sys.log")
        {
            currentLog = new Dictionary<string, string>();
            this.logFileName = AppDomain.CurrentDomain.BaseDirectory + logFileName;
            InitLogReader(this.logFileName);

        }

        public void CloseLogFile()
        {
            if (reader != null)
            {
                reader.Close();
                reader = null;
            }
        }

        public long LogByteSize
        {
            get
            {
                FileInfo fi = new FileInfo(logFileName);
                return fi.Length;
            }
        }

        public void ClearLog()
        {
            CloseLogFile();
            TextWriter writer = new StreamWriter(logFileName,false);
            writer.Write("");
            writer.Close();
        }

        private void InitLogReader(string logFileName)
        {
            try
            {
                reader = new StreamReader(logFileName);
            }
            catch (FileNotFoundException e)
            {
                File.CreateText(logFileName);
                throw (e);
            }
            finally
            {
                reader = new StreamReader(logFileName);
            }
        }

        public IDictionary<string, string> Current
        {
            get
            {
                string line = reader.ReadLine();
                try
                {
                    if (!string.IsNullOrEmpty(line))
                    {
                        foreach (string pair in line.Split(';'))
                        {
                            string[] keyValue = pair.Split(':');
                            string key = keyValue[0];
                            string value = keyValue[1];
                            if (keyValue.Length > 2)
                            {
                                value += ":" + keyValue[2];
                            }
                            currentLog.Add(key, value);
                        }
                    }
                    return currentLog;
                }
                catch (Exception e)
                {
                    throw e;
                }
            }
        }

        object IEnumerator.Current
        {
            get
            {
                return Current;
            }
        }

        public void Reset()
        {
            CloseLogFile();
            LogCount = 0;
            InitLogReader(logFileName);
        }

        public bool MoveNext()
        {
            currentLog.Clear();
            if (reader.Peek() > -1)
            {
                LogCount++;            
                return true;
            }
            CloseLogFile();
            return false;
        }

        void IEnumerator.Reset()
        {
            Reset();
        }

        bool IEnumerator.MoveNext()
        {
            return MoveNext();
        }

        public void Dispose()
        {
            CloseLogFile();
        }

        public IEnumerator<IDictionary<string,string>> GetEnumerator()
        {
            return this;
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return (IEnumerator)this;
        }
       
    }
}