qr code c# source Introducing the Web Part infrastructure in C#.NET

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Introducing the Web Part infrastructure
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Before we go further, let s explore some basic facts about site pages and Web Parts in SharePoint. If you ve been working with SharePoint or ASP.NET, this might be old news to you but, nevertheless, it s always good to refresh your memory. This section examines the various components in the Web Part infrastructure that you ll encounter when building a page. In addition, you ll get your first look at a simple Web Part. You ll learn the different components and their responsibilities. Familiarize yourself with the technical terms because I ll use them throughout the book.
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Web Part page
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A Web Part page, which most often is the type of page you use to host Web Parts, is an ASP.NET page that inherits from or uses a specific SharePoint page class, the WebPartPage. This class, in turn, is inherited from the standard ASP.NET Page class. The responsibilities of a Web Part page are:
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Connecting to the SharePoint context. Performing user authorization. Hosting the Web Part Manager. Hosting the Web Part zones. Hosting the special zones for Web Part properties and the Web Part Gallery.
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To use Web Parts on a web page, that page needs to be equipped with one Web Part Manager and, optionally, Web Part zones. The Web Part Manager in SharePoint is defined in the master page, which makes it available to all pages using that master page. Figure 1.2 shows how the building blocks of a Web Part page are organized. Web Parts can live inside or outside a zone. When a Web Part is outside a zone and managed by the page, that Web Part is called a static Web Part and can t be customized by the end user using the web user interface. If a Web Part exists in a zone that s managed by the
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Introducing SharePoint 2010 Web Parts
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Page
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Static Web Part
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Web Part Manager Web Part Zone
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Dynamic Web Part
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Web Part
Figure 1.2 The building blocks of a Web Part page and how they re located in relation to one another
Web Part Manager, it can be customized and the customization can be persisted so that it s retained; it s then called a dynamic Web Part. The Web Part zones can also allow the user to add, remove, or move Web Parts that the user either can upload or find in the Web Part Gallery. The Web Part Manager and Web Part zone objects are defined in the ASP.NET object model, but SharePoint uses its own implementation of these objects. .NET Framework has a provider model that allows developers to create their own backends for Web Part storage, and the SharePoint product team has created providers for SharePoint and enhanced them for SharePoint use. The customization and personalization of Web Parts are stored in the SharePoint content databases using the SharePoint implementation of the provider model.
Web Part Manager The Web Part Manager control is responsible for handling the various Web Parts on a page. It deserializes and serializes Web Parts and their customizations from the content database, correctly places them in Web Part zones, and, optionally, connects them. During the Web Part page life cycle, a Web Part Manager fires and forwards all of the events on the different Web Parts. A Web Part Manager is responsible for:
Persisting properties and customizations of Web Parts. Managing the Web Part connections. Managing the Web Parts in Web Part zones. Wiring up the events to the Web Parts. Managing standard and mobile views.
There can be only one Web Part Manager on a page. In SharePoint, a Web Part Manager is defined in the master page. Removing it from the master page or adding it directly to a page can make the page fail.
Web Part zones A Web Part zone acts together with the Web Part Manager to render Web Parts onto the page. It s responsible for creating the chrome any borders or styles around the
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