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SharePoint Object MicrosoftSharePointSPList
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Description A SharePoint list that can be used to modify the contents of a list A SharePoint site A SharePoint user The context of an HTTP request that gives information, such as the current web application, site collection, list, etc An item in a SharePoint list A SharePoint site collection
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MicrosoftSharePointSPWeb MicrosoftSharePointSPUser MicrosoftSharePointSPContext
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MicrosoftSharePointSPListItem MicrosoftSharePointSPSite
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Introduction
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TABLE 3-1: Most Commonly Used SharePoint Object Model Objects Ordered by Number of References to the Object on the Web (Continued)
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SharePoint Object MicrosoftSharePointSPFile
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Description A file in a SharePoint site, for example, a web part page, a file in a folder, or an item in a document library A column defined for a SharePoint list A query (in CAML) that can be used to return required list items (SPListItem) Provides a method called RunWithElevatedPrivileges that lets you run code with more permissions than the one the current user has An IIS web application that has methods and properties for modifying web application settings and administering at the web application level A SharePoint Farm that has methods and properties for modifying farm settings and administering at the farm level An exception thrown by SharePoint The collection of SPItem objects from a SharePoint list (SPList) or query (SPQuery) This object represents SharePoint s connection to native unmanaged code In many cases, if you do not dispose correctly of SharePoint objects, the SPRequest object associated with them will proliferate and will be referred to in error messages A SharePoint folder in a list or document library Continues
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MicrosoftSharePointSPField MicrosoftSharePointSPQuery
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MicrosoftSharePointSPSecurity*
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MicrosoftSharePoint AdministrationSPWebApplication*
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MicrosoftSharePoint AdministrationSPFarm*
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MicrosoftSharePointSPException MicrosoftSharePointSPListItemCollection
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MicrosoftSharePointLibrary SPRequest
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3: Introduction to the SharePoint Object Model
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TABLE 3-1: Most Commonly Used SharePoint Object Model Objects Ordered by Number of References to the Object on the Web (Continued)
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SharePoint Object MicrosoftSharePointUtilities SPUtility
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Description A utility class that provides useful methods such as SendEmail used to send an e-mail from a SharePoint site A query that can act against multiple lists in multiple sites in the same site collection
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MicrosoftSharePointSPSiteDataQuery
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* Not available in sandboxed solutions
Figure 3-1 shows a diagram that describes how all of these commonly used objects relate to each other in the SharePoint object model
SPWebApplication SPSiteCollection SPSite SPWebCollection SPWeb SPListCollection
SPQuery SPSiteDataQuery SPList SPListItemCollection
SPFile SPListItem SPFolder SPFieldCollection SPField
Figure 3-1: The relationships among commonly used objects in the SharePoint object model
The Disposable Pattern in SharePoint Development
The Disposable Pattern in SharePoint Development
In Table 3-1, you might have noticed the comment about SPRequest The SPRequest object is something that you don t typically use directly as it represents SharePoint s connection from managed objects like SPSite to the unmanaged part of SharePoint But it will appear in error dialogs when you don t dispose of a managed object correctly This section will talk about the patterns you must use when using the SharePoint object model to ensure disposal of objects that implement IDisposable If you don t properly dispose of objects in the SharePoint object model that implement IDisposable, you will have memory usage problems in your application Under heavy load, SharePoint may perform poorly or even exit when memory allocation fails So it is critical to properly dispose of these IDisposable objects The objects to be most careful of are SPSite and SPWeb, which must be disposed of because they consume large amounts of unmanaged memory
But I Thought Garbage Collection Took Care of Memory Management
You might wonder why you must dispose of these objects yourself and why garbage collection doesn t just take care of these things The answer is that an object like SPSite uses a mix of managed and unmanaged code The memory usage of the managed side of SPSite is monitored by the NET garbage collector, and when enough memory is used by the managed code, the garbage collector will kick in The problem is that the NET garbage collector doesn t watch the unmanaged code s use of memory and the unmanaged memory use is much greater than the managed memory use So you can quickly run out of memory on the unmanaged side without NET ever feeling like it needs to do a garbage collection
There are several coding patterns you should use in your code when working with SPWeb and SPSite and other objects that implement IDisposable The first pattern to know about is the Dispose method The basic idea