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using (SPWeb root = siteRootWeb) { foreach (SPList list in rootLists) { ConsoleWriteLine(listTitle); } }
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Developing with SharePoint 2010
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As well as explicitly creating SPWeb objects, references to the current SPWeb object can often be obtained from other sources For example, when you re writing code that runs in the context of a web page, the static SPContextCurrent property provides a reference to the current SPWeb object, as this code snippet shows:
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SPList list = SPContextCurrentWebListsTryGetList(ListName); if (list == null) { //do stuff }
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We ll explore retrieving SPWeb objects in this manner in some of the examples in this book
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Most SharePoint content is stored within lists or document libraries Within the Server Object Model, both lists and document libraries are represented by an SPList object Although not included in our diagram, document libraries are also represented by SPDocumentLibrary objects The SPDocumentLibrary class is derived from the SPList class and provides additional functionality that is appropriate for document libraries Other classes are derived from SPList and represent specific types of list; for more information, see http://msdnmicrosoftcom/ en-us/library/microsoftsharepointsplistaspx
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As mentioned, most content within a SharePoint site is accessed via an SPList object Each item in a list or library is in turn represented by an SPListItem object that is accessed via the SPListItems collection The SPList class and the SPListItem class will feature heavily in practically all development on the SharePoint platform As you ll see in 4, these objects also have implementations within the Client Object Model
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Although almost all content is represented by an SPListItem object, where the content in question is a file, the SPListItem object only represents the metadata for the file For example, if we create a document library and upload a Word document, the SPListItem object that represents the document will contain only the document title as well as a few additional system-generated metadata fields To perform work on the document, we need to use an SPFile object as shown next
Part I
PART I
Introduction to SharePoint 2010 Development
void ListRootWebMasterPages() { ConsoleWriteLine("Master Page files in site collection root site:"); using (SPSite site = new SPSite("YourSiteCollectionURL")) { using (SPWeb root = siteRootWeb) { SPList masterPages = rootListsTryGetList("Master Page Gallery"); if (masterPages != null) { SPListItemCollection items = masterPagesItems; foreach (SPListItem fileItem in items) { SPFile file = fileItemFile; ConsoleWriteLine(fileName + "\t" + stringFormat("{0:###,### bytes}",fileLength)); } } } } }
SPFolder
Most user-generated content within SharePoint sites is stored in lists and document libraries, and these document libraries can also contain folders that operate in the same way as folders in the file system As well as folders that are used for organizing user content, other folders contain files that are used by the SharePoint platform itself These files often contain configuration files for platform elements such as content types The following code snippet shows how to enumerate folders within a SharePoint site Folders used for organizational purposes have an attached DocumentLibrary object, whereas system folders do not
void ListRootWebFolders() { ConsoleWriteLine("Files in site collection root site:"); using (SPSite site = new SPSite("YourSiteCollectionURL")) { using (SPWeb root = siteRootWeb) { listFolders(rootFolders); } } } void listFolders(SPFolderCollection folders) { foreach (SPFolder folder in folders) { ConsoleWrite(folderName + "\t"); if (folderDocumentLibrary != null) { ConsoleWriteLine("Corresponding library: " + folderDocumentLibraryTitle); } else
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Developing with SharePoint 2010
Saving Changes Using the Server Object Model
Behind the scenes, SharePoint, like many enterprise applications, stores all data within a database Many of the objects that we ve seen are actually an in-memory copy of the state of a particular component, and as a result, changing properties on the object affects only the in-memory copy and not the underlying database To commit object changes to the database, the Update method should be called, as this snippet shows:
void UpdateDescription() { ConsoleWriteLine("Lists in site collection root site:"); using (SPSite site = new SPSite("YourSiteColectionURL")) { using (SPWeb root = siteRootWeb) { rootDescription = "My New Description"; rootUpdate(); } } }
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