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This chapter explored three ways to create custom data-bound controls: subclassing Framework controls, creating a user control that contains Framework data-bound controls, and creating a data-bound control from scratch In the process, you got some exposure to how many of the interfaces described in the last chapter were used from a control's perspective as a consumer Some key takeaways from this chapter are:
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Inheriting from Framework controls is great for customizing simple presentation aspects of the control, but it is difficult to modify the data-binding behavior without a great deal of study of the protected members and interrelated behavior of those members in the class Control containment is a better way to go for most custom controls, as shown in the filtered grid example Building a generalized data-bound control from scratch is a lot of work, but building one that is specific to a given use case and a specific shape of data is much easier to tackle The ListBindingHelper class makes it easy to obtain an appropriateIList reference from a data source without having to test for all the various related interface types yourself
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In the next chapter we'll jump to the other side of the data-binding fenceto the data collection and object side, and you'll see how to create custom objects and collections of objects that are suitable for data binding in Windows Forms
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9 Implementing Custom Data-Bound Business Objects and Collections
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THROUGHOUT MOST OF the samples in this book I have used relational data sources, specifically typed data sets, as the data source to which you connect binding sources and controls from the form's perspective There are several reasons for this One is that the predominate way of storing application data is in relational databases, and thus bringing the data into your application as a relational data collection provides a low impedance mismatch between the data that your application operates on and the data that your application persists and loads Another is that the use of relational data in the presentation tier is still the most common way of presenting collections of data and letting users interact with that data And the final reason is that in the past, it has typically been easier to work with relational data in data-binding scenarios than it was to work with custom business objects, partly because of the tools and the effort required to properly define business objects and collections of those objects that are suitable for data binding The problem with using relational data in the presentation layer is that it makes it more likely that your application will be tightly coupled from the data tier all the way into the presentation layer When you are tightly coupled in this way, small changes in the data schema at the database level require changes all the way through your data access, business, and presentation layers You are forced to go find all the places in your application that touched a particular part of your database so that you can update the data access that is working against that data This doesn't have to be the case, because you can decouple your business layer through a combination of stored procedures and defining separate data set types in the business layer from those defined in the data access layer But sometimes defining custom business objects makes more sense than to decouple your business layer and give you more explicit control of everything that is going on in the objects that you use for data presentation and manipulation Luckily in NET 20, in both the Windows Forms and ASPNET portions of the Framework, it is far easier than in previous versions of the Framework to work with custom object collections and still get a rich data-binding experience, both at design time and runtime It still requires more work than using data sets, but the tooling and the classes in the NET Framework have significantly reduced the amount of work involved 5 showed how you can use the Data Sources window to add an object data source, which allows you to bind to collections of objects and follow the same process of connecting and configuring that data source to your bound controls This chapter focuses on what it takes from the perspective of the data objects and collections to be suitable for use in data binding, and how to implement custom objects and collections to maximize their capabilities in a data-binding scenario
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