Events scheduled to occur at an appointed time are represented in MindFusion.Scheduling for WPF by the abstract class Item. Item comprises the information that should be defined for all schedule events. For example, the StartTime and EndTime properties specify the time and duration of an event. The Recurrence property lets you create recurrent events that occur repeatedly following some recurrence pattern. There are several descriptive properties that define additional information about an item, such as Priority, HeaderText and DescriptionText. The class also defines methods that support serialization in XML.

It is possible to associate resources with scheduled events via the Resources, Contacts, Location and Task properties of Item. These properties contain objects from the Resource, Contact, Location and Task classes respectively.

The appearance of items when viewed in the Calendar can be set via the ItemSettings property. It lets you define the color, alignment and style of various elements of the item visualization, such as frame lines, fill, header and description texts, icon images, and so on.

The abstract class Item is derived by the concrete class Appointment, which can be readily used in your applications. You could also define your own event class, which derives either from Appointment or Item. In order to integrate your custom class into the calendar API and user interface, you must do the following:

• Provide parameterless constructor to let users create items of the custom class interactively;
• Override the SaveTo / LoadFrom methods if you have any additional data fields in your custom class and register the class for serialization using the Schedule.RegisterItemClass method;
• Override CopyOccurrence to support recurrence of the custom item. Also ensure you call MarkException on the associated recurrence whenever a custom property of the new item changes.