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CHAPTER
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Starting Field Getting Fields and Field Types to Behave
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ields are the smallest bits of information and so easy to overlook. Fields are as important to the user experience as anything, so you need to make sure you know how to build that experience. Unlike Einstein, who sought to split the smallest known parts in the universe, you want to learn how to create these atomic storage units. These units will then be used when we build our empire in later chapters. In this chapter, you will learn about custom field type development. You may have heard people talking about how difficult the process of custom field type development is. However, after you have completed the exercises in this chapter, you will likely be very surprised at how easy this can actually be. In the second part of the chapter, we will create site columns to deploy to our new site. We will create several column types, including one approach for creating lookup columns that uses a feature receiver. And I ll give you some parenting advice .
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Mission Statement
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Our goal for this chapter is to create a custom field type that will be used as the title of articles in our newspaper web site. We will create a field type that resembles the normal single line of text type but then add custom displaying and input of the data to see how to do this in a fullscale implementation. Next we will create several site columns to be included in the articles. We will explore different field types for our columns and find a solution to the problem of nonworking lookup columns.
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A Note on Custom Field Types
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Before we dive into the deep end, I want to take a few paragraphs to talk a bit about custom field types. It seems that, right after custom views in CAML, custom field type development is
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CHAPTER 11 STARTING FIELD
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among the tasks SharePoint developers fear most. A lot of web sites demonstrate how to develop custom field types, but most are either directly based on or derivatives of the custom field walkthrough example from MSDN (http://www.understandingsharepoint.com/url/ 10032). Even seasoned SharePoint veterans seem to be elusive about just how custom field types work and especially about how to develop one. During this chapter you may be surprised how incredibly easy custom field type development can be, if done right. Many of the exercises here will show you, using illustrative examples, of course, how you can change a custom field type in just one or two steps while utilizing the parent field type that has already done most of the hard work for you. Don t get me wrong, custom field type development is a complex topic, and online documentation and examples are scarce. At the time of this writing, a full eight hits are returned when googling SharePoint BaseTextField, even when this is one of the simplest (and should be most inherited) classes for explaining how custom field types can be developed. So, even after reading this chapter and understanding how all the pieces of custom field type development work, don t just run off to your team and start evangelizing custom field type development. Yes, custom field type development is a really cool method of customizing how users interact with data. Yes, custom field type development allows you to give your designers a plain-vanilla ASP.NET control to add whatever goodies designers like to add and have it still work. However, also consider how people will maintain your solution. Being the only person on your team who understands a particular component may make you indispensable, but it also makes your solution quite more complex and can increase the cost of maintenance. Consider whether there are alternatives among the methods you have learned in this book before you go to the somewhat drastic step of creating a custom field type.
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