Microsoft SharePoint. Building Office 2007 Solutions in VB 2005 ...

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CHAPTER 11 ■ PROGRAMMING SHAREPOINT SERVICES 429Listing 11-8. Running Code with Elevated PermissionsSub ShowFeatures()'Code goes hereEnd Sub■Caution Running code with elevated permissions should be done only after careful consideration of theconsequences. Obviously, you would not want to grant such permissions regularly. Additionally, this newcapability should make you extremely wary of using third-party web parts from untrusted sources becausethey could easily be running with elevated privileges and you would not know it.Accessing Lists and List ItemsAlong with site collections, you will access lists and list items frequently. Typically when dealingwith lists, you are interested in a particular site rather than a site collection. You can get areference to an individual site by using the GetContextWeb method of the SPControl object.Once a site is open, you may access all of the lists it contains through the SPListCollectionobject. The collection contains an SPList object for every list on the web site. The followingcode shows how to enumerate the lists for the current web site:Dim objSite As SPWeb = SPControl.GetContextWeb(Context)Dim objLists As SPListCollection = objSite.ListsFor Each objList As SPList In objListsNext
430CHAPTER 11 ■ PROGRAMMING SHAREPOINT SERVICESIt is important to understand that SharePoint considers almost everything to be a list. Thisincludes not only obvious components such as task lists, but more subtle components such asdocument libraries and discussion forums. Therefore, you will find it useful to be able to differentiatebetween various lists that are returned in code. Each SPList object has a BaseTypeproperty that returns an SPBaseType enumeration specifying what kind of list is represented.Here is a list of the members of the SPBaseType enumeration:• SPBaseType.DiscussionBoard• SPBaseType.DocumentLibrary• SPBaseType.GenericList• SPBaseType.Issue• SPBaseType.Survey• SPBaseType.UnspecifiedBaseTypeOnce you have accessed a list of interest, you may subsequently access the items inthe list. Each item in the list is represented by an SPListItem object contained in anSPListItemCollection object. Enumerating these list items follows the same pattern asyou have already seen.Regardless of whether you are accessing sites, lists, or items, each object has a set ofproperties and methods that are meaningful. Typically, this means returning the Name,Title, or URL associated with an object. Additionally, each object has some special propertiesand methods designed to return useful collections. For example, you can return justthe webs associated with the current user by utilizing the GetSubwebsForCurrentUsermethod of the SPWeb class.Accessing User InformationWhen iterating through sites and lists, you quite often want to know how they apply to thecurrent user. You may be interested in knowing what role the current user has on a site orwhat items in a list are assigned to the current user. You can access this information using anSPUser object. The following code shows how to return the SPUser object that represents thecurrent user:Private objSiteCollection As SPSite = _SPControl.GetContextSite(Context)Private objSite As SPWeb = objSiteCollection.OpenWebPrivate objUser As SPUser = objSite.CurrentUserOnce the SPUser object is returned, you can retrieve the logon name of the user throughthe LoginName property. You can also retrieve the display name for the user through the Nameproperty. Because list assignments are made using these values, you can often determinewhich items in a list belong to the current user by comparing the Assign To field of a list itemto these values. Listing 11-9 shows how to look through a collection of lists and display thetasks assigned to the current user in a web page.
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THE EXPERT’S VOICE ® IN SHAREPOI
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Microsoft SharePoint: Building Offi
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Contents at a GlanceAbout the Autho
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viii■CONTENTSAnalysis and Design
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x■CONTENTSUsing Audiences . . . .
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xii■CONTENTSExercise 6.1. InfoPat
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xiv■CONTENTSUsing the Office Open
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xvi■CONTENTS■CHAPTER 12 SharePo
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About the Technical Reviewer■JIM
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IntroductionWith SharePoint now in
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■INTRODUCTIONxxvChapter 8: ShareP
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2CHAPTER 1 ■ SHAREPOINT BUSINESS
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CHAPTER 2SharePoint Overview,Planni
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CHAPTER 2 ■ SHAREPOINT OVERVIEW,
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CHAPTER 3SharePoint FundamentalsSha
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CHAPTER 3 ■ SHAREPOINT FUNDAMENTA
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104CHAPTER 4 ■ SHAREPOINT SHARED
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CHAPTER 5SharePoint ContentDevelopm
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CHAPTER 5 ■ SHAREPOINT CONTENT DE
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CHAPTER 6SharePoint Document, Form,
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CHAPTER 6 ■ SHAREPOINT DOCUMENT,
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CHAPTER 7SharePoint Custom Features
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CHAPTER 7 ■ SHAREPOINT CUSTOM FEA
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CHAPTER 8SharePoint BusinessIntelli
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CHAPTER 8 ■ SHAREPOINT BUSINESS I
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CHAPTER 9SharePoint and Microsoft O
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CHAPTER 9 ■ SHAREPOINT AND MICROS
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CHAPTER 10SharePoint Web PartsThe p
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CHAPTER 10 ■ SHAREPOINT WEB PARTS
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CHAPTER 12 ■ SHAREPOINT OPERATION
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492■INDEXAllow Writers to View Ca
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494■INDEX■Csegmenting informati
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496■INDEXCourse Description custo
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498■INDEXconfiguring components,
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500■INDEXcreating user-defined fu
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502■INDEXindividual level product
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504■INDEXlayout tables, 158LAYOUT
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506■INDEXdeploying VSTO 2005 SE s
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508■INDEXonLoad attribute, 348OnL
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510■INDEXproject documents, 18Pro
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512■INDEXextending web applicatio
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514■INDEXoverview, 71-72pages, 80
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516■INDEXtransformers, 392Tree Vi
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518■INDEXWeb Part Pages web servi
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