private async void CreateEventForm_LoadAsync()

in Office365APIEditor/UI/CreateEventForm.cs [44:205]

• 126 lines of code
• 19 McCabe index (conditional complexity)

        private async void CreateEventForm_LoadAsync(object sender, EventArgs e)
        {
            Icon = Properties.Resources.DefaultIcon;
            
            attachments = new List<ViewerHelper.Data.AttachmentAPI.AttachmentBase>();

            // Display the window in the center of the parent window.
            Location = new Point(Owner.Location.X + (Owner.Width - Width) / 2, Owner.Location.Y + (Owner.Height - Height) / 2);

            viewerRequestHelper = new ViewerRequestHelper();

            groupBox_Recurring_Pattern.Enabled = false;
            groupBox_Recurring_Range.Enabled = false;

            radioButton_Recurring_Pattern_Daily.Checked = true;

            groupBox_Recurring_Pattern_Weekly.Enabled = false;
            groupBox_Recurring_Pattern_Monthly.Enabled = false;
            groupBox_Recurring_Pattern_Yearly.Enabled = false;

            comboBox_Recurring_Pattern_Monthly_DayOfWeekIndex.Items.Add("First");
            comboBox_Recurring_Pattern_Monthly_DayOfWeekIndex.Items.Add("Second");
            comboBox_Recurring_Pattern_Monthly_DayOfWeekIndex.Items.Add("Third");
            comboBox_Recurring_Pattern_Monthly_DayOfWeekIndex.Items.Add("Fourth");
            comboBox_Recurring_Pattern_Monthly_DayOfWeekIndex.Items.Add("Last");

            comboBox_Recurring_Pattern_Yearly_Relative_DayOfWeekIndex.Items.Add("First");
            comboBox_Recurring_Pattern_Yearly_Relative_DayOfWeekIndex.Items.Add("Second");
            comboBox_Recurring_Pattern_Yearly_Relative_DayOfWeekIndex.Items.Add("Third");
            comboBox_Recurring_Pattern_Yearly_Relative_DayOfWeekIndex.Items.Add("Fourth");
            comboBox_Recurring_Pattern_Yearly_Relative_DayOfWeekIndex.Items.Add("Last");

            for (int i = 1; i <= 100 ; i++)
            {
                comboBox_Recurring_Pattern_Daily_Interval.Items.Add(i);
                comboBox_Recurring_Pattern_Weekly_Interval.Items.Add(i);
                comboBox_Recurring_Pattern_Monthly_Interval.Items.Add(i);
                comboBox_Recurring_Pattern_Yearly_Interval.Items.Add(i);
                comboBox_Recurring_Range_NumberOfConcurrences.Items.Add(i);
            }

            comboBox_Recurring_Pattern_Daily_Interval.SelectedItem = 1;
            comboBox_Recurring_Pattern_Weekly_Interval.SelectedItem = 1;
            comboBox_Recurring_Pattern_Monthly_Interval.SelectedItem = 1;
            comboBox_Recurring_Pattern_Yearly_Interval.SelectedItem = 1;
            comboBox_Recurring_Range_NumberOfConcurrences.SelectedItem = 10;

            radioButton_Recurring_Pattern_Monthly_MonthlyPattern.Checked = true;
            ToggleMonthlyPatternUI(true);

            for (int i = 1; i <= 31; i++)
            {
                comboBox_Recurring_Pattern_Monthly_DayOfTheMonth.Items.Add(i);
                comboBox_Recurring_Pattern_Yearly_Absolute_Day.Items.Add(i);
            }

            for (int i = 1; i <= 12; i++)
            {
                string monthName = System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.MonthNames[i - 1];
                comboBox_Recurring_Pattern_Yearly_Absolute_Month.Items.Add(monthName);
                comboBox_Recurring_Pattern_Yearly_Relative_Month.Items.Add(monthName);
            }
 
            comboBox_Recurring_Pattern_Monthly_DayOfTheMonth.SelectedItem = 1;

            radioButton_Recurring_Pattern_Yearly_OnSpecificDay.Checked = true;
            ToggleYearlyPatternUI(true);

            radioButton_Recurring_Range_NoEnd.Checked = true;

            DateTime now = DateTime.Now; // Use local time;
            DateTime tempStartDateTime = now;

            if (tempStartDateTime.Minute < 30)
            {
                tempStartDateTime = tempStartDateTime.AddMinutes(30 - tempStartDateTime.Minute);
            }
            else if (tempStartDateTime.Minute == 30)
            {
                tempStartDateTime = tempStartDateTime.AddMinutes(30);
            }
            else if (30 < tempStartDateTime.Minute && tempStartDateTime.Minute < 60)
            {
                tempStartDateTime = tempStartDateTime.AddMinutes(60 - tempStartDateTime.Minute);
            }

            dateTimePicker_Basic_StartDate.Value = tempStartDateTime;
            dateTimePicker_Basic_StartTime.Value = tempStartDateTime;

            DateTime tempEndDateTime = tempStartDateTime.AddMinutes(30);
            dateTimePicker_Basic_EndDate.Value = tempEndDateTime;
            dateTimePicker_Basic_EndTime.Value = tempEndDateTime;

            string localTimeZone = Util.LocalTimeZoneId;

            // Load all system time zones and add them to the combo box.
            var timeZoneCollection = TimeZoneInfo.GetSystemTimeZones();
            foreach (var timeZone in timeZoneCollection)
            {
                var matches = Regex.Matches(timeZone.DisplayName, @"^\(UTC.*\)\s");

                if (matches.Count == 1)
                {
                    comboBox_Basic_TimeZone.Items.Add($"{matches[0]} {timeZone.Id}");
                }
                else
                {
                    comboBox_Basic_TimeZone.Items.Add(timeZone.Id);
                }

                if (timeZone.Id == localTimeZone)
                {
                    // Select local time zone.
                    comboBox_Basic_TimeZone.SelectedIndex = comboBox_Basic_TimeZone.Items.Count - 1;
                }
            }

            // Load all calendar API supported time zones and add them to the combo box.
            foreach (var timeZone in Util.GetCalendarApiSupportedTimeZones())
            {
                comboBox_Basic_TimeZone.Items.Add(timeZone);
            }

            comboBox_BodyType.SelectedIndex = 1;

            comboBox_Recurring_Range_NumberOfConcurrences.Enabled = false;
            dateTimePicker_Recurring_Range_EndByDate.Enabled = false;

            comboBox_OnlineMeeting_Provider.Items.Add("None");
            comboBox_OnlineMeeting_Provider.SelectedIndex = 0;

            // Get allowedOnlineMeetingProviders

            try
            {
                var allowedOnlineMeetingProviders = await viewerRequestHelper.GetAllowdOnlineMeetingProvidersAsync();

                if (allowedOnlineMeetingProviders == null || allowedOnlineMeetingProviders.Count == 0)
                {
                    throw new Exception("Microsoft Graph request was succeeded, but allowedOnlineMeetingProviders property is null or empty.");
                }

                if (allowedOnlineMeetingProviders.Count == 1 && allowedOnlineMeetingProviders[0] == "unknown")
                {
                    throw new Exception("Microsoft Graph request was succeeded, but allowedOnlineMeetingProviders property contains only 'unknown'");
                }

                foreach (var provider in allowedOnlineMeetingProviders)
                {
                    if (provider != "unknown")
                    {
                        comboBox_OnlineMeeting_Provider.Items.Add(provider);
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Could not get allowed online meeting providers." + Environment.NewLine + Environment.NewLine + ex.Message, "Office365APIEditor", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }

            textBox_Basic_Title.Focus();
        }