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Introducing SharePoint 2010 Web Parts
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provides support for the mobile view of Web Part pages as well as mobile Web Parts. These changes are mostly internal to the assembly but, in later chapters, when we focus on these components, you ll see how you can use some of these enhancements. One of the most notable changes is that the customization of a Web Part is versioned just as the Publishing Web Part page is versioned, which was not the case in earlier versions of SharePoint. This is an important improvement and it s crucial for you to be aware of it. If you roll back a page to a previous version, any changes to your Web Part customization will also be rolled back. The upside is that versioning makes it easier for you to experiment with customizations of a Web Part if you d like to go back to the original or working state, you just roll back the page. To improve security and to prevent injection of malicious code, the Web Part infrastructure includes cross-site scripting (XSS) protection. We ll discuss this protection mechanism further in chapter 7.
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You ve just read about the basics of Web Parts and their infrastructure. Because this is a book for developers, what would be better than looking at a Web Part using the classic Hello World sample in a Hello World Web Part This simple Web Part will write the text Figure 1.5 A Hello World Web Part, showing the default Web Part options menu in the right Hello World in the Web Part content area. corner The result for the end user should look similar to figure 1.5. The text is written in the content area and the title is automatically generated by Visual Studio. The Web Part options menu shown in the figure is the default menu of any Web Part. The Hello World example in the following listing is quite basic if you re familiar with ASP.NET development. Using Visual Studio 2010, you first have to create a SharePoint project and then add a Web Part item to that project with the name HelloWorldWebPart.
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Listing 1.1 Hello World Web Part
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public class HelloWorldWebPart : System.Web.UI.WebControls.WebParts.WebPart { public override void CreateChildControls() { Label label = new Label(); label.Text = "Hello World!"; this.Controls.Add(label); base.CreateChildControls(); } }
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The Web Part is defined in the HelloWorldWebPart.cs file. The class derives from the ASP.NET Web Part class, which exists in the System.Web.UI.WebControls.WebParts
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namespace and System.Web assembly. To add the Label control, you override the CreateChildControls method, and in the overridden method, a new Label control is created and added to the control tree. The Text property of the Label control gets the value of "Hello World". Using Visual Studio 2010, you press F5 to build and deploy the Web Part into SharePoint 2010. The Web Part will be added to the Web Part Gallery during the deployment, and all you have to do is edit a page, locate the Web Part in the gallery, and add it to the page. This F5 deployment will be shown in greater detail in chapter 3. As you can see from the sample code, the title and options aren t specified. The Web Part s title inherits from the base class and is, by default, the name of the class. Every Web Part has a set of default verbs that are added to the Options menu. Later, I ll walk you through the steps involved in the creation and deployment of Web Parts using Visual Studio 2010, and I ll do the same with the Web Part Manager, zones, and connections. In SharePoint, along with the compiled assembly for the Web Part that you deploy to SharePoint, there are a few more files, and we ll cover them all as well. But, first, let s continue our look at the Web Part infrastructure.
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