Supporting Rich Design-Time Declarative Programming in Visual Studio .NET

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Supporting Rich Design-Time Declarative Programming
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Selecting a control in the designer and setting properties or using context menus to alter the behavior of that control is a form of declarative programming This is something that Windows Forms programmers have grown to expect from rich controls due to the support for this programming paradigm that Visual Studio provides You have seen a few simple examples of providing rich designer support in the attributes that you added to the DataSource and DataMember properties in the FilteredGrid You will see a few others with the ToolboxItem and ToolboxBitmap attributes in the next example You should also include Description and Category attributes for any properties that will be exposed in the Properties window You have seen that any properties added to your control that have types recognized by Visual Studio will be automatically displayed in the Properties window when your control is selected You will be able to edit those properties with the editors associated with that type in Visual Studio Visual Studio provides a great deal of capability that enables you to go well beyond this You can use a variety of other attributes to influence other design-time behaviors, and you can create custom type converters that allow the Properties window to convert input strings into complex types that the Properties window wouldn't ordinarily recognize You can design custom editors that can plug into the Properties window so you can edit your complex types in a rich graphical way, similar to the Anchor property on form controls or the Color selection dialog that is presented for properties of type Color
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You can also create separate designer classes that you associate with your control to provide alternative or supplemental rendering of your control when it is hosted in the designer as opposed to how it presents itself at runtime These capabilities are outside the scope of this book, but you can read more about them in a variety of sources on Windows Forms designer support programming For adding design-time features to controls, I recommend Windows Forms Programming in C# by Chris Sells Chris Sells and Mike Weinhardt wrote a two-part series on the topic for MSDN magazine in the April and May 2003 issues
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Building a Custom Data-Bound Control from Scratch
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So far I have presented examples of deriving from a built-in Framework control or developing a user control that contains other controls and exposing a data-binding interface on that user control However, sometimes you may need to build custom controls that aren't simple containment scenarios for existing Framework controls, and you may want to support data binding on these controls as well If you can at least handle containing a binding source component as a child component of your control, you can let it do most of the data-binding dirty work, as you saw in the last example with the FilteredGrid That control inherently supports all the myriad forms of data collections that the Framework controls do, simply because it is using a binding source to sort the data from whatever is provided as a data source and data member In case you need to be more directly in the loop for rendering your control and accessing the data that is bound to it, you may have to eschew the support of the binding source and drop back to dealing with different forms of data collections yourself If you do this, one approach would be to handle all the different interface types described in 7 directly, figuring out whether you have a list, a list of lists, a list of lists of lists, and so on, and figuring out type information and sorting and filtering capabilities on your own There is still some other support in the Windows Forms classes that can save you some of this grunt work without using a binding source, as you will see in the next example So to demonstrate getting a little "closer to the metal" and how to implement a data-bound control that doesn't rely on any Framework controls for its data binding, let's jump right into another example
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