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

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CHAPTER 11 ■ PROGRAMMING SHAREPOINT SERVICES 437Listing 11-12. Returned GetListItems CAML FragmentThe GetListItems method takes several arguments and requires some additional effort tocall because several of the parameters are actually CAML fragments themselves. These parametersmust be constructed in code before the method call is made. Specifically, the GetListItemsmethod requires the following parameters: listName, viewName, query, viewFields, rowLimit,and queryOptions.The listName parameter is either the list name (e. g., Shared Documents) or the GUID ofthe target list from which items are to be returned. This is the same parameter that is usedthroughout the various methods of the Lists web service. This parameter is required.The viewName parameter is the GUID of the view to be used when determining what fieldsto return. This parameter is optional and can be replaced with the keyword Nothing in VB.When no view is specified, the method will return the fields contained in the default list viewunless you override this behavior by specifying different fields. Generally, it is easier not tosupply this parameter and specify the desired fields later.The query parameter is a properly formatted CAML Query element that specifies whatitems to return from the list. This parameter is optional and can be replaced with the keywordNothing in VB. When provided, the defined query overrides the query normally associated withthe default view.The viewFields parameter is a properly formatted CAML ViewFields element that specifieswhat fields are to be returned with each item. This parameter is optional and can be replacedwith the keyword or Nothing in VB. When provided, the defined field set overrides the field setnormally associated with the default view.The rowLimit parameter is a string representing the number of items to return from themethod call. This parameter is optional and can be replaced with the keyword Nothing in VB.When provided, the rowLimit overrides the limits associated with the default view. The rowLimitparameter can also be used to set up a paging when used in conjunction with the queryOptionsparameter.
438CHAPTER 11 ■ PROGRAMMING SHAREPOINT SERVICESThe queryOptions parameter is a properly formatted QueryOptions element. This parameteris optional and can be replaced with the keyword Nothing in VB. The QueryOptions elementacts as a container for other elements that specify the options for the method call.In the same way that we parsed the returned CAML fragment from previous method calls,we can do this to display the information returned from the GetListItems method; however,you should note that the field names returned from this method call are prefixed with ows_,which must be taken into consideration when writing the code. Listing 11-13 shows a completeexample that returns all the documents from a library and displays their titles in a list.Listing 11-13. Returning Documents from a LibraryDim objService As MyService.Lists = New MyService.ListsobjService.Url = "http://Server_Name/Site_Path/_vti_bin/Lists.asmx"objService.Credentials = System.Net.CredentialCache.DefaultCredentialsDim objDocument As XmlDocument = New XmlDocumentDim objQuery As XmlNodeobjQuery = objDocument.CreateNode(XmlNodeType.Element, "Query", "")objQuery.InnerXml = ""Dim objFields As XmlNodeobjFields = objDocument.CreateNode( _XmlNodeType.Element, "ViewFields", "")objFields.InnerXml = ""Dim objCAML As XmlNodeobjCAML = objService.GetListItems( _MyLists.SelectedItem.ToString, Nothing, _objQuery, objFields, Nothing, Nothing)For Each objNode As XmlNode In objCAML.ChildNodes(1).ChildNodesIf Not ((objNode.Attributes Is Nothing)) _AndAlso Not ((objNode.Attributes("ows_Title") Is Nothing)) ThenMyDocs.Items.Add(objNode.Attributes("ows_Title").Value)End IfNextAfter you have identified the fields for a given document, you may want to update themand save those changes back to the list. You can update any field associated with a list usingthe UpdateListItems method of the Lists web service. This method takes as parameters thetitle or GUID of the list and a CAML Batch element that defines the operations to be performedon the list items.The CAML Batch element is a container for one or more Method elements that define theindividual operations to be performed as a single batch. This structure allows you to performmultiple insert, update, and delete operations with a single call to the UpdateListItems methodof the web service. The Method element provides an identifier attribute for the individual
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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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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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