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... Return New InstanceDescriptor(ctor, _ New Object() { _ gradient.ColorA, gradient.ColorB, gradient.GradientFillStyle} ) Else Return MyBase.ConvertTo(context, culture, value, destinationType) End If End Function The last step is to change the DesignerSerializationVisibility for the property from Content to Visible. That way, the entire object will be serialized (triggering the type converter), not just the individual subproperties. Once you ve made these changes, the designer serialized code will use the GradientFill constructor, and generate code like this: Me.gradientPanel1.GradientFill.ColorA = New GradientFill( _ Color.Cyan, Color.Plum, LinearGradientMode.Horizontal)

By using the serialization attributes, ShouldSerializeXxx() methods, and type converters, you have a good amount of control over how design-time changes are persisted into form code. For most cases, this level of control is enough. However, if you are developing extremely complex controls or commercial tools, you might need fine-grained control. You can get this through a .NET feature known as CodeDOM, although it s far from easy. CodeDOM (code document object model) is a .NET API for generating code dynamically. What s unique about CodeDOM is that you create code constructs by instantiating and linking various objects, and these objects can create code in any supported language. That means a C# developer can use your control just as easily as a VB developer, because both languages have CodeDOM providers that allow CodeDOM objects to be serialized into their respective languages. The problem is that serializing code with CodeDOM is far from trivial, and pitfalls abound. It s also incredibly tedious, and you ll quickly find that you need to construct quite a few objects just to model simple code statements. For a basic introduction to CodeDOM, refer to the MSDN article at http://msdn.microsoft.com/library/en-us/dndotnet/html/custcodegen.asp.

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You might have heard that functional programming is an advanced topic. I don t think functional programming is any more advanced than say threading or designing and implementing components. However, functional programming is a different style of programming. The situation is similar to a programmer encountering object-oriented code for the first time. It seems like an advanced topic because it introduces new concepts. As an introduction to functional programming, I highly recommend listening to a videocast interview of Anders Hejlsberg speaking about LINQ and functional programming (http://blogs.msdn.com/charlie/archive/2007/01/26/anders-hejlsberg-on-linq-andfunctional-programming.aspx). Anders is the creator of Delphi and C# (see http://en.wikipedia. org/wiki/Anders_Hejlsberg for more information). Here s the big functional programming message I received from that interview: Writing code that is side-effect-free. Side-effect-free code is functional programming. Programming with side effects is imperative programming. C# is an imperative language. Imperative programming means to write code that modifies state. The following is an example of imperative programming. int x = 0; x = x + 1;

My job meant I had to do a lot of traveling, so I spent quite a lot of time in hotel rooms or on trains and planes, and I came to view these occasions as time to try out stuff in F# I ended up exchanging quite a lot e-mails with Don Syme, and eventually we met up We went for a beer in the pub where Watson and Crick went after they first pieced together the structure of DNA Will people talk about the pub were Syme and Pickering first met years from now Errrm, perhaps not Anyway, all this led me to wonder what I should do with my new-found knowledge of F# and functional programming About this time, a guy named Jim Huddleston posted to the F# mailing list to ask if anyone would like to write a book about F#.

The Properties window does a solid job of providing support for enumerations. For example, if you create a property that uses a custom enumeration, the Properties window automatically provides a drop-down list with the values from the enumeration. For example, consider the DisplayStyle property shown here: Public Enum DisplayStyle Standard SpecialDirectoryPictures AllDirectoryPictures End Enum

Private _displayStyle As DisplayStyle Public Property DisplayStyle() As DisplayStyle Get Return _displayStyle End Get Set(ByVal value As DisplayStyle) _displayStyle = value End Set End Property

CHAPTER 16 WRITING FUNCTIONAL CODE IN C#

Tip You can hide individual values in an enumeration from appearing in the Properties window. Just use

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