Can someone help me understand this method

Question

User657329123 posted

Hi there,

This code comes from an events calendar. If an event is associated with a date, that date is highlight otherwise it isn't. I'm having a had time understanding this function.

    protected void CalendarDRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
        // If the month is CurrentMonth
        if (!e.Day.IsOtherMonth)
        {
            foreach (DataRow dr in table.Rows)
            {
                if ((dr["caldate"].ToString() != DBNull.Value.ToString()))
                {
                    DateTime dtEvent = (DateTime)dr["caldate"];
                    if (dtEvent.Equals(e.Day.Date))
                    {
                        e.Cell.BackColor = Color.Blue;
                        e.Cell.ForeColor = Color.Red;
                    }
                }
            }
        }
        //If the month is not CurrentMonth then hide the Dates
        else
        {
            e.Cell.Enabled = false;
        }
    }

I don't understand what is this !e.Day.IsOtherMonth. I have tried running this code in Debug mode to see how control flows but don't understand the above code.

Joe

Answer 1

User2103319870 posted

I don't understand what is this !e.Day.IsOtherMonth.

This property is used to check if a current active date is from this month or not.

FROM MSDN : Gets a value that indicates whether the date represented by an instance of this class is in a month other than the month displayed in the Calendarcontrol

Complete Code explanation

protected void CalendarDRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
        {
            //Check if the current active day in calendar is from this month or not
            if (!e.Day.IsOtherMonth)
            {
                //loop through each rows in datatable
                foreach (DataRow dr in table.Rows)
                {
                    //CHeck if caldate column is not equal to null
                    if ((dr["caldate"].ToString() != DBNull.Value.ToString()))
                    {
                        //Conver the caldate value to datetime
                        DateTime dtEvent = (DateTime)dr["caldate"];
                        //check if caldate value is equal to current active date in calendar
                        if (dtEvent.Equals(e.Day.Date))
                        {
                            //If so then hightligh the cell in calendar
                            e.Cell.BackColor = Color.Blue;
                            e.Cell.ForeColor = Color.Red;
                        }
                    }
                }
            }
            //If the month is not CurrentMonth then hide the Dates
            else
            {
                e.Cell.Enabled = false;
            }
        }

Answer 2

User657329123 posted

Thanks A2H. If I comment out the following lines and say if I'm in the month of May then I no longer see dates highlighted even if an even is associated with that date.  But if I don't comment it out, then I see the event details associated with a date in May but the calendar displays the current month instead of May. Any idea why?

    protected void CalendarDRender(object sender, System.Web.UI.WebControls.DayRenderEventArgs e)
    {
        // If the month is CurrentMonth
        //if (!e.Day.IsOtherMonth)
        //{
            foreach (DataRow dr in table.Rows)
            {
                if ((dr["caldate"].ToString() != DBNull.Value.ToString()))
                {
                    DateTime dtEvent = (DateTime)dr["caldate"];
                    if (dtEvent.Equals(e.Day.Date))
                    {
                        e.Cell.BackColor = Color.Aquamarine;
                        e.Cell.ForeColor = Color.Crimson;
                    }
                }
            }
        //}
        //If the month is not CurrentMonth then hide the Dates
        //else
        //{
        //    e.Cell.Enabled = false;
        //}
    }

I'm lost.

Answer 3

User36583972 posted

Hi joegreen2005,

I suggest that you refer to the common usage of this control.

ASP.NET - Calendars:

http://www.tutorialspoint.com/asp.net/asp.net_calenders.htm

Customizing the ASP.NET Calendar Control:

http://www.codeproject.com/Articles/229445/Customizing-the-ASP-NET-Calendar-Control

Cool Calendar - Amazing Calendar without popup:

http://www.codeproject.com/Articles/8535/Cool-Calendar-Amazing-Calendar-without-popup

Best Regards,

Yohann Lu