/// <summary>
/// Selects an item in the ListItemCollection where the date specified is in the date format.
/// </summary>
/// <param name="listItems">the ListItemCollection in which to perform selection</param>
/// <param name="dateString">The date string</param>
/// <param name="displayDateFormat">The display format of the list item dates.</param>
/// <returns>
/// The number of items selected. This is either 0 or 1.
/// </returns>
private int PerformInitialSelectionForDate(ListItemCollection listItems, string dateString,
string displayDateFormat)
{
//Throw error if InitialSelection is empty string and list contains some items.
if (InitialSelection.Trim().Equals(String.Empty) && listItems.Count > 0)
{
throw new InitialSelectionInvalidDataException("InitialSelection can not be an empty string.");
}
//Try each list item for each date
foreach (ListItem item in listItems)
{
DateTime itemDate, selectDate;
try
{
itemDate = DateTime.ParseExact(item.Value, displayDateFormat, CultureInfo.InvariantCulture);
selectDate = DateTime.ParseExact(dateString.Trim(), DateFormat, CultureInfo.InvariantCulture);
}
catch (Exception e)
{
throw new InitialSelectionInvalidDataException("Could not convert date string to date.", e);
}
//Item must not be selected from before
if (!item.Selected && itemDate == selectDate)
{
item.Selected = true;
return(1);
}
}
return(0);
}
