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Searching for a List Item
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When using SharePoint lists and libraries, particularly for use as data, it can certainly be useful to loop through the items to find what you need However, this can be time consuming as it is the equivalent of doing it in a database; in other words, the more items, the longer the loop To eliminate this problem, SharePoint provides a common ability to search lists and libraries internally Searching for items in a list is done using Collaborative Application Markup Language (CAML) Query syntax using an object called SPQuery The basic syntax is much like XML queries, though there are some oddities (dates, for example, have to be in a specific format, as shown later in the chapter) The format is usually <Where> and then some comparison, <Leg> (Less than or Equal) or <Eq> (Equal), of the field to some value As an example (note this should be on one line):
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<Where><Eq><FieldRef Name=\"Title\" /> <Value Type=\"String\">The Title</Value></Eq></Where>
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The previous query says return all items where the Title is equal to The Title In most cases, the literal value (string, number) is what you use to compare, but there is one gotcha in how it deals with dates; these must be the format of YYYYMMDDTHH:MM:SSZ In the following example, this query will return all items in a list called Links that has had publishing date columns added to it (note that creating this list is shown in the next section):
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// Open the current Site (web): SPWeb TopLvlSite = SPControlGetContextWeb(Context); // Open a list: SPList NavList = TopLvlSiteLists["Navigation Page List"]; try { SPQuery ListQuery = new SPQuery(); SystemDateTime CurDt = SystemDateTimeToday; string Years = CurDtYearToString(); string Months = CurDtMonthToString(); string Days = CurDtDayToString(); string FormattedDt = YearsToString() + "-" + MonthsToString() + "-" + DaysToString(); // Never include the <Query> tags! The query will NOT execute: //WRONG: //ListQueryQuery = "<Query><Where><Leq><FieldRef // RIGHT: // Note: keep this on one line (broken here for readability): ListQueryQuery = "<Where><Leq><FieldRef Name=\"Publish_x0020_Date\" /> <Value Type=\"DateTime\">" + FormattedDt + "T00:00:00Z</Value> </Leq><Or><IsNull><FieldRef Name=\"Stop_x0020_Publish_x0020_Date\" /> </IsNull><Geq><FieldRef Name=\"Stop_x0020_Publish_x0020_Date\" /> <Value Type=\"DateTime\">" + FormattedDt + "T00:00:00Z</Value> </Geq></Or></Where><OrderBy><FieldRef Name=\"Appearance_x0020_Order\" /> </OrderBy>"; // SPListItemCollection AllItems = NavListGetItems(ListQuery); int TheCountOf = AllItemsCount; foreach (SPListItem AnItem in AllItems) {
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string TitleOf = (string)AnItem["Title"]; string UrlOf = (string)AnItem["Link"]; } } catch (Exception ErrorLoadingFromList) { // Some error handling }
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Notice that the actual query here equates to Return All Where the Publishing Date is Less Than or Equal to Today and the Stop Publishing Date is Greater than or Equal to Today or is Null There is also an Order By clause that orders the results by field called Appearance_ x0020_Order The full syntax for queries is in the SharePoint Software Development Kit (SDK) There is also a great (and free) tool available; download from Patrick Tisseghems CAML Query Builder V2 s blog site: http://wwwu2uinfo/Blogs/Patrick/Lists/Posts/Postaspx ID=1315
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Creating a New List and Adding Items
Creating lists and libraries is, of course, an easy thing to do with the SharePoint User Interface (or SharePoint Designer) However, if you are using your own application or creating some custom functionality in SharePoint and need a list to store some information, you can do this easily in code In many ways, you can use custom lists as a database; since access to a database can be very restrictive in some environments, you can use a SharePoint list the same way you use a data table and you get the added benefit that it can be both visible to and maintained by users For example, assume that users want to use a custom list of links to vendor sites and they want to include publishing dates to control whether a link shows or not I don t want to get too complicated with this example, but the fundamentals are important in working with SharePoint Because of this, rather than a bland example, the following is a real-life example that does the following: 1 The routine is passed an SPWeb object, which it will connect to and then create a new list 2 The routine then adds several new columns (fields) to the new list; it also sets the field parameters (where it will appear, the type, and so on) 3 After adding the fields, it creates a new item and then adds that to the list 4 The SPList object is returned to the original caller
//================================================================== // CreateNewList //================================================================== /// <summary>CreateNewList</summary> /// <returns>True or false if list created</returns> private bool CreateNewList(SPWeb WebToCreateListIn, out SPList CreatedList) { SystemGuid NewListGuid = new SystemGuid(); CreatedList = null; // THIS IS REQUIRED WHEN CREATING NEW LISTS!!
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