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

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CHAPTER 10 ■ SHAREPOINT WEB PARTS 391The provider web part, which supplies the value to be passed, will implement the customconnection interface. Along with the implementation of the interface, the provider web partexposes a property that returns a reference to the connectable interface. The property mustthen be decorated with the ConnectionProvider attribute, which marks the interface as connectablewithin the web part infrastructure. Listing 10-10 shows how a web part class wouldimplement an interface and expose it for connections.Listing 10-10. Implementing a Custom InterfacePublic Class StringProviderInherits WebPartImplements IStringConnectionProtected strString As String = "Test Data" _Public Function ConnectionInterface() As IStringConnectionReturn MeEnd FunctionPublic ReadOnly Property ProvidedString() As String _Implements IStringConnection.ProvidedStringGetReturn strStringEnd GetEnd PropertyEnd ClassThe consumer web part, which will receive the passed value, must contain a method forreceiving the connection interface. This method is also decorated with the ConnectionProviderattribute. This attribute determines which web parts on a page are compatible for connections.Listing 10-11 shows how a web part class would obtain a reference to the connectable interfaceand receive the passed value.Listing 10-11. Receiving a ValuePublic Class StringConsumerInherits WebPartPrivate objProviderPart As IStringConnection = Nothing _Public Sub GetConnectionInterface( _ByVal objProviderPart As IStringConnection)objProviderPart = objProviderPartEnd Sub
392CHAPTER 10 ■ SHAREPOINT WEB PARTSProtected Overloads Overrides Sub RenderContents( _ByVal writer As HtmlTextWriter)Trywriter.Write(objProviderPart.ProvidedString)Catchwriter.Write("No Connection")End TryEnd SubEnd ClassOnce you have created and deployed compatible web parts, you can add them to a page.After they are on the page, they can be connected using the web part menu associated witheither the provider or the consumer. When compatible web parts are on the same page, a menuitem titled Connections will be available for selecting a compatible web part. This menu itemfunctions identically to the ones you have used previously in the book to connect out-of-theboxweb parts.Using Standard Connection InterfacesWhile creating custom interfaces is a quick way to connect web parts, they cannot be used toconnect to libraries, lists, and out-of-the box web parts. SharePoint provides a separate set ofinterfaces that constitute a standard mechanism for connecting web parts. These interfacesexpose methods and events that allow the connection infrastructure to query your web partsfor appropriate connection information and provide notification when another web partwants to connect. The available interfaces support passing a single piece of data, a row ofdata, or an entire list of data. Table 10-1 lists the available interfaces and their purposes.Table 10-1. Connection InterfacesInterfaceIWebPartFieldIWebPartRowIWebPartTableIWebPartParametersPurposeAllows a web part to provide or consume a cell of dataAllows a web part to provide or consume a row of dataAllows a web part to provide or consume a recordset of dataAllows a web part to provide or consume multiple cells of data that can bemapped to the data cells in another web partIf a provider web part and a consumer web part are exchanging similar data—such as asingle cell—they may be connected directly using the web part menu associated with eitherpart. Connection interfaces, however, can often allow connections that are not immediatelyobvious. For example, a web part that provides an entire row can be connected to a web partthat only consumes a single field.Determining which interfaces are compatible is handled by the web part infrastructureaccording to several rules. The first, and most obvious, rule is that web parts providing or consumingthe same data structures are always compatible. For interfaces that use different datastructures, extended connections—known as transformers—are allowed where they make
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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 11 ■ PROGRAMMING SHAREPOI
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CHAPTER 12SharePoint Operations and
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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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