Power4: Custom property templates and custom event templates

re: Power4: Custom property templates and custom event templates

Shimmy Weitzhandler — Sun, 04 Mar 2012 23:25:42 GMT

Interesting.

Anyway How will you force a getter and a setter? doesn't it have to fulfill a contract by implementing an interface etc.?

re: Power4: Custom property templates and custom event templates

Simon Geering — Tue, 02 Mar 2010 16:37:35 GMT

Um interesting. Might be worth talking to Rocky Lhotka as this looks similar to what you do in CSLA business objects with that frameworks Property Manager.

re: Power4: Custom property templates and custom event templates

Kevin Ryall — Sun, 14 Feb 2010 04:27:13 GMT

We use code gen for dependency property implementation at the moment, but something like this could potentially be a much simpler alternative. Personally, I prefer code syntax solutions to IDE features (I read a lot of code outside the VS IDE), but I’m not sure of the best syntax for this...

re: Power4: Custom property templates and custom event templates

Đonny — Fri, 05 Feb 2010 20:40:29 GMT

What about slightly different approach: Specify property template as XML (like snippet) in XML file. (If you really want to make it reusable and have it "compiled" in assembly, it can be placed there as resource. Otherwise just have such XML file as part of project) The template can contain everything what snippet can contain - Property, Backing field, OnXxxChanged event, WPF stuff, attributes, XML doc comments etc. Compiler takes the template in compile time, does some text-based replacements there and compiles result of it (more like C++ macro).

It's up to template-creator if the template will be created such way it generates 50 lines for each property or if it calls some common validation/storage etc. methods.

Disadvantage might be that template is not language-independent. Advantage is that it is very flexible.

==== Templates.xml =====

<?xml version="1.0" encoding="utf-8"?>

<code>

<![CDATA[

/// <summary>Contains value of the <see cref="$Name$"/> property</summary>

Private $Field$ As $Type$

$Doc$

<exception cref="ArgumentNullException">Property is being set to <see langword="null"/></exception>

$Attrs$

Public Property $Name$ As $Type$

Get

Return $Field$

End Get

Set(ByVal value As $Type$)

If value Is Nothing Then Throw New ArgumentNullException("$Name$ cannot be null","value")

$Field$ = value

End Set

End Property

]]>

<code>

</template>

</templates>

=== Class.vb ==============

Class [Class]

/// <summary>Gets or sets value</summary>

Property Value As String From NotNullProperty

End Class

re: Power4: Custom property templates and custom event templates

Heinzi — Wed, 03 Feb 2010 15:10:10 GMT

I'd like to add another usage scenario:

Property Width As Double From New DependencyPropertyClrWrapper(WidthProperty)

Writing Depenceny Properies in VB is a pain, and this would reduce the current, annoying 8-line

Public Property Width() As Double

Get

Return DirectCast(GetValue(WidthProperty), Double)

End Get

Set(ByVal value As Double)

SetValue(WidthProperty, value)

End Set

End Property

to a simple one-liner.