private void ParseWUFrequency()

in src/PatchOrchestrationApplication/NodeAgentNTService/src/Manager/ServiceSettings.cs [135:232]
86 lines of code
19 McCabe index (conditional complexity)

        private void ParseWUFrequency()
        {
            string[] arr = WUFrequency.Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries).Select(str => str.Trim()).ToArray();
            if(arr.Count() == 0)
            {
                throw new ArgumentException("Illegal WUFrequency Parameter : "+ WUFrequency);
            }

            this.Frequency = (Frequency)Enum.Parse(typeof(Frequency), arr[0]);
            DateTime currentDateTime = DateTime.UtcNow;

            switch (this.Frequency)
            {
                case Frequency.Monthly:
                    if (arr.Count() != 3)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
                    }

                    if (arr[1].Trim().Equals("Last", StringComparison.InvariantCultureIgnoreCase))
                    {
                        this.IsLastDayOfMonth = true;
                    }
                    else
                    {
                        int dayOfMonth = (int) Convert.ChangeType(arr[1], typeof(int));
                        if (dayOfMonth > MaxSupportedDayOfMonth)
                        {
                            throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency + ". The day of month should be between 1 to 28.");
                        }
                        this.Date = new DateTime(currentDateTime.Year, currentDateTime.Month, dayOfMonth, 0, 0, 0);
                        this.Date = this.Date.Date + TimeSpan.Parse(arr[2]);
                    }
                    break;

                case Frequency.MonthlyByWeekAndDay:
                    if (arr.Count() != 4)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
                    }

                    this.WeekOfMonth = (int)Convert.ChangeType(arr[1], typeof(int));
                    this.DayOfWeek = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), arr[2]);
                    this.Time = TimeSpan.Parse(arr[3]);

                    if (this.WeekOfMonth < 1 || this.WeekOfMonth > 4)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency + ". The WeekOfMonth should be between 1 to 4.");
                    }
                    break;

                case Frequency.Weekly:
                    if (arr.Count() != 3)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
                    }
                    this.DayOfWeek = (DayOfWeek)Enum.Parse(typeof(DayOfWeek), arr[1]);
                    this.Date = currentDateTime;
                    this.Date = this.Date.Date + TimeSpan.Parse(arr[2]);                    
                    break;

                case Frequency.Daily:
                    if (arr.Count() != 2)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
                    }
                    this.Date = currentDateTime;
                    this.Date = this.Date.Date + TimeSpan.Parse(arr[1]);                    
                    break;

                case Frequency.Once:
                    if (arr.Count() != 3)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
                    }
                    this.Date = DateTime.Parse(arr[1]);
                    this.Date = this.Date.Date + TimeSpan.Parse(arr[2]);
                    break;

                case Frequency.None:
                    if (arr.Count() != 1)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
                    }
                    break;

                case Frequency.Hourly:
                    if (arr.Count() != 2)
                    {
                        throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
                    }                    
                    this.HourlyFrequencyInMinutes = (long)Convert.ChangeType(arr[1], typeof(long));
                    break;

                default:
                    throw new ArgumentException("Illegal WUFrequency Parameter : " + WUFrequency);
            }
        }