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When a server-side verb is invoked, the event flow is quite different from a normal postback (see figure 4.21). The Verbs property is retrieved after the OnLoad method and, after that, the verb events are invoked. This means that, if you re referencing any of the controls built in the CreateChildControls method, you have to use the EnsureChildControls method in your verb event handler. In listing 4.10, we did just that.
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The server-side verb events are invoked
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This is one of the core chapters of this before the CreateChildControls method. The book and hopefully a chapter that verbs are retrieved two times in this flow: just before you ll return to many times. I can t the verb events and then once again after the view state is saved. emphasize enough the importance of knowing the event flow of Web Parts and how important it is to build a user interface that adapts to the SharePoint look and feel. Microsoft put a lot of effort into making SharePoint 2010 comply with a lot of standards and to widen the range of browsers that are supported. One single Web Part can destroy all of this. Visual Web Parts, which you learned about in chapter 3, will allow developers to start building Web Parts in a faster and easier way. This means that we ll see more and more development of Web Parts and with very different results. In the previous versions of SharePoint, it was harder to build Web Parts and that wasn t always bad. It was easier to place all the visual appearance styling in a CSS file than to write tons of code in the Web Part. Because you have direct access to the HTML markup using Visual Web Part, a lot of the UI design that could be replaced with CSS will be placed in the user controls. I don t want you to be one of those who build the Web Parts that others are going to show as bad practice. In the next chapter, we ll take a look at how you can make your Web Parts customizable and personalizable. That s another chapter that contains essential knowledge for every Web Part developer.
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Making Web Parts customizable
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This chapter covers
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Adding properties to Web Parts Learning the default Web Part properties Using custom Editor Parts Dealing with complex properties
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One of the key features of Web Parts is that the user can customize them. The Web Part infrastructure was designed with this in mind; it provides several features to aid the developer. Web Parts and other controls in ASP.NET have properties that can be used to control the logic, appearance, and behavior. These properties are normally set in the code by the programmer, but Web Parts can be exposed and customized using the web interface. This chapter shows how you as a developer can expose the properties to your end users so that they can customize or personalize them. You ll learn the default Web Part properties; you ll add your own properties and eventually create a custom interface for interacting with them. Properties can be simple types, such as strings or integers, which SharePoint supports. For advanced types and properties, there s
Web Part properties
no out-of-the-box support for editing, which means that you need to implement the logic yourself for those. SharePoint Server 2010 also includes support for targeting Web Parts to groups and audiences. I ll show you how this works behind the scenes and explain how to implement a similar targeting behavior for SharePoint Foundation. Apart from the actual user interface of the Web Part, the editing of the properties is where your Web Part meets the end user. It s therefore a necessity to have the enduser experience in mind when making your Web Parts customizable.
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