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

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CHAPTER 10 ■ SHAREPOINT WEB PARTS 369Listing 10-2. Creating a PropertyDim strConnection As String _Public Property Connection() As StringGetReturn strConnectionEnd GetSet(ByVal value As String)strConnection = valueEnd SetEnd PropertyRendering Web PartsBecause the WebPart class inherits from System.Web.UI.Control, the entire user interfacefor a web part must be created through code. Although you can make use of ASP.NET controlsin your web part, there is no drag-and-drop design capability in Visual Studio. Thisapproach is definitely a drawback and can slow your ability to create web parts. Be that asit may, it becomes less of an issue once you have created a few web parts and learned thetechniques for generating the user interface.■Note It is popular among some developers to utilize a technique where a web part is made to load a usercontrol at run time. Using this technique allows a developer to have a drag-and-drop experience at designtime supported through the user control. I have written about this technique in my book Advanced Share-Point Services Solutions (Apress, 2004) but it is beyond the scope of this book. If you are interested in thisapproach, visit http://workspaces.gotdotnet.com/smartpart.Properly rendering a web part requires that you first create any ASP.NET controls that youwill need in code. The required ASP.NET controls are then added to the controls collection ofthe web part by overriding the CreateChildControls method of the base class. Finally, you candraw the output by overriding the RenderContents method. You may use any available ASP.NETcontrol found in Visual Studio .NET or any ASP.NET control you have written to create the userinterface for a web part. Remember though that these controls cannot be dragged onto a page.Instead, they must be declared in code. When you declare ASP.NET controls in code, be sure toset a reference to the appropriate namespace. Nearly all of the ASP.NET controls that youcould want belong to the System.Web.UI.WebControls namespace.Once the controls are declared, you can set their properties and add them to the Controlscollection of the web part. You can do this by overriding the CreateChildControls method. Inthis method, set property values for each control and then add it to the Controls collection
370CHAPTER 10 ■ SHAREPOINT WEB PARTSusing the Controls.Add method. You can also utilize event handlers for the ASP.NET controls,which will be necessary to capture button clicks and the like. Listing 10-3 shows several controlsbeing added to a web part.Listing 10-3. Adding ASP.NET Controls to a Web PartProtected txtDisplay As New TextBoxProtected WithEvents btnGo As New ButtonProtected Overrides Sub CreateChildControls()Me.Controls.Add(btnGo)txtDisplay.Width = Unit.Percentage(100)Me.Controls.Add(txtDisplay)End SubPrivate Sub btnGo_Click( _ByVal sender As Object, ByVal e As System.EventArgs) _Handles btnGo.ClicktxtDisplay.Text = "Button clicked!"End SubOnce the controls are all configured and added to the web part, you are ready to draw theoutput. When rendering the user interface of the web part, you use the HtmlTextWriter classprovided by the RenderContents method. This class allows you to create any manner of HTMLoutput for the web part.As a general rule, you should render your user interface within an HTML . The reasonfor this is that you can never be sure what the web part page layout will look like. As yousaw in Chapter 5, layouts and web part zones can take almost any form. Therefore, you shoulduse the relative layout offered by the tag to respect the width defined by the zonewhere the web part appears. Listing 10-4 shows how to render a table containing ASP.NETcontrols. You should take particular note of the width definition within the table.■Note Style sheet purists may prefer to use a style class to control the layout of a web part. While you cancertainly reference style sheet classes from a web part, SharePoint makes extensive use of layout tables, so Ido not see much of an issue with using them in your web parts.
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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 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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