[SharePoint 2007/2010]Query SharePoint Calendar Event

首先要搞清楚日历事件的各种类型，参考文章：

http://sharepoint.microsoft.com/blog/Pages/BlogPost.aspx?PageType=4&ListId={72C1C85B-1D2D-4A4A-90DE-CA74A7808184}&pID=761

Type	Description	fRecurrence	fAllDayEvent	EventType
Single event	An event created with the All Day Event and Recurrence checkboxes unselected.	FALSE	FALSE	0
All-day event	An event created with the All Day Event checkbox selected.	FALSE	TRUE	0
Recurring event	An event created with the Recurrence checkbox selected. Has a recurrence icon in the All Events view. Appears as a single master event on the All Events view, but as recurring instances on the Current Events and Calendar views.	TRUE	FALSE	1
Recurring all-day event	Same as above, but with the All Day Event checkbox selected at creation time.	TRUE	TRUE	1
Recurrence exception	Created by editing an instance of a recurring event. Has a strikethrough recurrence icon in the All Events view.	TRUE	FALSE	4
All-day recurrence exception	Same as above, but created by editing an instance of an all-day recurring event.	TRUE	TRUE	4
Deleted instance of a recurring event	Created by deleting a instance of a recurring event. Title is prefixed with “Deleted:” in the All Events view, and is hidden in the Current Events and Calendar views.	TRUE	FALSE	3
Deleted instance of an all-day recurring event	Same as above, but created by deleting an instance of an all-day recurring event.	TRUE	TRUE	3

　　重复事件

Field	Value for single event	Value for recurring event
EventDate	Start date and time	Start date and time set for the recurring event when it was created, which may be an earlier date than the first instance of the recurring event.
EndDate	End date and time	End date and time for the last instance of the recurring event. For recurring events with no end date, this is a computed date several years in the future.
Duration	The time in seconds between EventDate and EndDate.	The duration in seconds of an individual instance of the recurring event.

　　特例事件和已删除事件

Field	Value for exception or deleted instance
MasterSeriesItemID	The ID of the recurring event from which this exception or deleted instance was made.
RecurrenceID	The date and time of the instance of the recurring event which this exception or deleted instance takes the place of.

　　重复事件的重复模式

Recurrence type	RecurrenceData field value
Daily every 1 days, no end date	<recurrence> 　　<rule> 　　　　<firstDayOfWeek>su</firstDayOfWeek> 　　　　<repeat><daily dayFrequency="1" /></repeat> 　　　　<repeatForever>FALSE</repeatForever> 　　</rule> </recurrence>
Weekly every Monday, Tuesday, and Wednesday, end by 5/31/2007	<recurrence> 　　<rule> 　　　　<firstDayOfWeek>su</firstDayOfWeek> 　　　　<repeat> 　　　　　　<weekly mo="TRUE" tu="TRUE" we="TRUE" weekFrequency="1" /> 　　　　</repeat> 　　　　<windowEnd>2007-05-31T22:00:00Z</windowEnd> 　　</rule> </recurrence>
Monthly the third Wednesday of every 2 months, no end date	<recurrence> 　　<rule> 　　　　<firstDayOfWeek>su</firstDayOfWeek> 　　　　<repeat> 　　　　　　<monthlyByDay we="TRUE" weekdayOfMonth="third" monthFrequency="2" /> 　　　　</repeat> 　　　　<repeatForever>FALSE</repeatForever> 　　</rule> </recurrence>
Yearly every May 18, end after 10 instances	<recurrence> 　　<rule> 　　　　<firstDayOfWeek>su</firstDayOfWeek> 　　　　<repeat><yearly yearFrequency="1" month="5" day="18" /></repeat> 　　　　<repeatInstances>10</repeatInstances> 　　</rule> </recurrence>

虽然事件的重复模式是以XML格式储存，但在使用ClientObjectModel查询时，并不需要手动去解析XML。

使用SPQuery对象查询时，需指定以下属性：

ExpandRecurrence -- 是否展开重复事件

CalendarDate -- 指定查询的参考时间

查询每日事件

             using (SPSite site = new SPSite(siteUrl))
             {
                 using (SPWeb web = site.OpenWeb())
                 {
                     SPList calendar = web.GetList(listUrl);
                     SPQuery caml = new SPQuery();
                     caml.Query = @"<Where>
                                     <DateRangesOverlap>
                                         <FieldRef Name='EventDate' />;
                                         <FieldRef Name='EndDate' />
                                         <FieldRef Name='RecurrenceID' />
                                         <Value Type='DateTime'><Today /></Value>
                                     </DateRangesOverlap>
                                 </Where>";

                     caml.ExpandRecurrence = true;
                     caml.CalendarDate = DateTime.Now;

                     return calendar.GetItems(caml);
                 }
             }

查询每周事件

                     caml.Query = @"<Where>
                                     <DateRangesOverlap>
                                         <FieldRef Name='EventDate' />;
                                         <FieldRef Name='EndDate' />
                                         <FieldRef Name='RecurrenceID' />
                                         <Value Type='DateTime'><Week /></Value>
                                     </DateRangesOverlap>
                                 </Where>";

查询每月事件

                     caml.Query = @"<Where>
                                     <DateRangesOverlap>
                                         <FieldRef Name='EventDate' />;
                                         <FieldRef Name='EndDate' />
                                         <FieldRef Name='RecurrenceID' />
                                         <Value Type='DateTime'><Month /></Value>
                                     </DateRangesOverlap>
                                 </Where>";

查询每年事件

                     caml.Query = @"<Where>
                                     <DateRangesOverlap>
                                         <FieldRef Name='EventDate' />;
                                         <FieldRef Name='EndDate' />
                                         <FieldRef Name='RecurrenceID' />
                                         <Value Type='DateTime'><Year /></Value>
                                     </DateRangesOverlap>
                                 </Where>";