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Introducing SharePoint 2010 Web Parts
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An important part of the Web Part infrastructure is the ability to connect Web Parts. Connected Web Parts can send or retrieve information from one Web Part to another. This concept allows developers to create advanced web pages and dashboards that users can connect to via the web interface. SharePoint provides a special kind of Web Parts called filter Web Parts. They have one purpose: to deliver a filter to other Web Parts so that their content can be filtered. For example, suppose you have a product catalog Web Part. You can set up a filter Web Part that filters the product catalog when users choose a product category in the filter Web Part. All these factors together are what makes Web Parts so interesting and useful when creating custom applications or solutions for SharePoint. You as a developer can create configurable applications that users can adapt to their method of work. The user might also combine the Web Parts by connecting them together and, from that, create their own applications or mashups. A web page or web application built using different external sources or open APIs is often referred to as a mashup. You might consider everything in SharePoint, including Web Parts, Business Connectivity Services (BCS), and InfoPath, as external sources for mashups.
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The concept of Web Parts isn t unique to SharePoint. All major vendors and platforms have their version of Web Parts that are more or less evolved. In the Java world you might know them as portlets, Google uses gadgets for their iGoogle site, and so on. Web Parts can also be used to connect portals from different vendors and platforms using, for instance, the Web Services for Remote Portlets (WSRP) standard, which allows you to publish content from one portal to another, or the recently ratified Content Management Interoperability Specification (CMIS) standard. If you re an ASP.NET developer, you might be familiar with Web Parts, because that infrastructure exists in the ASP.NET 2 Framework. SharePoint is built on top of ASP.NET and has extended the Web Part infrastructure and introduced a number of new and improved features. Using Web Parts instead of building custom ASP.NET applications allows you to take advantage of the SharePoint feature set, including infrastructure, user management, deployment, and scalability. This enables you to focus on the business goals of the application instead of building a new infrastructure. Web Parts are essentially ASP.NET WebControl objects or, to be more exact, ASP.NET Panel objects. Therefore, from a developer perspective, the first thing you need to learn is ASP.NET programming in the language of your choice: C#, Visual Basic, or even F#. SharePoint 2010 is built on the .NET Framework version 3.5 and ASP.NET 2, so anything in those frameworks can be used when developing Web Parts for SharePoint 2010. This book assumes that you re familiar with ASP.NET 2 development and we ll highlight only those areas where you have to be extra careful. One of the most important and, very often, underestimated concepts is the ASP.NET page and control life cycle. In the later chapters, you ll see examples of why this concept is so important.
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NOTE All code samples throughout the book will use C#. You can download these samples from www.manning.com/wilen or www.sharepointwebpartsinaction.com.
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Web Parts are just one but important component of the huge SharePoint product without Web Parts, you couldn t enjoy the platform s flexibility. It s the Web Parts that make SharePoint as well as other Web Part based portals interesting for both editors and end users. As mentioned earlier, building a new web page or site can be done without programming skills. Editors create their pages and choose Web Parts from a gallery. Then, they customize a Web Part and save the page and, all of this is done from the browser. The Web Parts that users can choose are determined by the administrator (and the permissions on the Web Parts). A Web Part s configuration options are defined by the developer who created the Web Part. One of the reasons Web Parts are easy to use when creating custom applications for SharePoint is that they can be self-contained or grouped together. The business logic and the user interface are based on the .NET and ASP.NET development, which lets you get started right away, if you re familiar with .NET development. Because Web Parts share a lot of common features and they re managed in the same way, it s easy for the end user to get started with a new Web-Part based application. If users are familiar with SharePoint, they know how to find, add, and edit a page s Web Part. This makes the adaptation of new features or applications in your SharePoint environment faster and easier. You can deploy a Web Part to the site collections of the SharePoint environment that you want your Web Part to be able to run in, and you can even control who can use the Web Parts through the built-in permissions in SharePoint. SharePoint 2010 comes with a number of Web Parts that you can use which ones are available depends on which version of SharePoint you ve installed. Appendix A, Out-of-the-box Web Parts, contains references to the most used Web Parts and their corresponding edition. Web Parts come in a couple of different types. The basic Web Part shows user tasks, the contents of a list, or a graph. Then, you have Web Parts that need customization, such as the Content Editor Web Part or Forms Web Part. For more advanced use, there are the new XSLT List View Web Part or the Data Form Web Part; both need to be configured using SharePoint Designer, and you can use them to create more advanced applications than you can using just the web browser. Also available are complete suites or standalone Web Parts that can be downloaded for free or purchased. In many cases, getting one of these off-the-shelf products can solve your problem for a much lower price compared with the cost of developing a Web Part. You can custom-design applications, perhaps, in combination with these standard products and build Web Parts that do exactly what you want. When do you need to create your own Web Parts The Data Form Web Part is an excellent tool and should be used whenever possible. It s great for connecting to an external data source or web service and, then, all you have to do is customize the view of the data. SharePoint 2010 also introduces a new way to connect to external data using External Lists in SharePoint. External Lists, in combination with the out-of-thebox Web Parts, can be used to create an interface for your custom database in SharePoint using just configuration techniques.
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