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The Activity Designer
Not actually a WF 4.0 blog any more :)
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The Activity Designer
Working with Commands in a Workflow Designer Rehost Application
Posted
over 3 years ago
by
tilovell09
1
Comments
Issuing, Handling, and Intercepting Commands in a WF4 Rehosted Designer application. Background on Commands in WPF I thought I understood Commands, but when I found myself having difficulties explaining things to a customer last week I realized...
The Activity Designer
(WF4) Setting a default type parameter for Generic Activities added from the Toolbox
Posted
over 2 years ago
by
tilovell09
1
Comments
One of our internal customers pinged me with a quick question today. He asked whether it is possible to set a default type argument for T if you have an activity of GenericType, say DataCollectorActivity<T>. I might have said this in passing by...
The Activity Designer
Why can’t I change the TypeArgument of Switch<> or FlowSwitch<> using the property grid?
Posted
over 2 years ago
by
tilovell09
1
Comments
I don’t remember anyone ever actually asking me this, but I found myself wondering the question today while rustling up a quick rehosting app. Foreach<> activity lets you change the TypeArgument dynamically via the property grid. But FlowSwitch<>...
The Activity Designer
(OffTopic) ‘ThreadSafe’ Classes
Posted
over 2 years ago
by
tilovell09
1
Comments
[Or: Rant - Code-Reviewing Random Code on the Internet.] I’m sure I’ve stumbled upon this post before once, and I hit it again today. I think it’s a little unfortunate this appears so high up in the results, as the post has a bunch...
The Activity Designer
Why you should use IRegisterMetadata
Posted
over 2 years ago
by
tilovell09
1
Comments
or: best practices registering Workflow Activity Designers Getting your first custom Activity Designer to show up is not hard. There are plenty of samples to find. However, something mostly under-explained in such samples is that the way you get started...
The Activity Designer
(WF4) Showing an InArgument<bool> as a CheckBox in the Workflow Designer Property Grid
Posted
over 2 years ago
by
tilovell09
1
Comments
Here’s a workflow designer FAQ finally getting the attention it deserves, and helping show off how to do custom property editing in designer. “How do I show an InArgument<bool>/<enum> in the property grid as a checkbox/combobox?” [Aside...
The Activity Designer
WeakReference collections and the heavy WeakReference class
Posted
over 3 years ago
by
tilovell09
1
Comments
Briefly diverging from regular posts: here’s something really fun. As far as I know, prior to 4.0, .Net has had, two built in ways to do weak object references. 1) WeakHandle 2) GCHandle, which is what WeakHandle uses under the covers. If you have ever...
The Activity Designer
Literal<T> and Reference Types
Posted
over 3 years ago
by
tilovell09
1
Comments
[Edit – I had to cut the pictures, they got broken by software update issues.] With two forum posts in two days vaguely related to Literal<T>, suddenly the Literal<T> problem seems interesting again. Shortly prior to the release of Visual...
The Activity Designer
More from PDC
Posted
over 3 years ago
by
tilovell09
0
Comments
Not to forget the interests of regular readers, you can get some of the latest WF news from Ron Jacob’s Windows Workflow Foundation Futures PDC talk. Updating with the direct link: http://player.microsoftpdc.com/Session/3b87c17b-a218-40d3-984f-78a012331dee...
The Activity Designer
Rory tackles Dependency Injection
Posted
over 3 years ago
by
tilovell09
0
Comments
It might be the first time I someone contacted me to about a blog they wrote about custom WF activities. Of course I was chuffed that they thought I might be interested. The articles really were interesting to me so I’m doubly happy to link them: http...
The Activity Designer
Counting down to PDC 10…
Posted
over 3 years ago
by
tilovell09
0
Comments
Only 8 more days to go ‘til October 28! PDC is sold out, but if you’re not attending in person, 1) keynotes and sessions are going to be streaming live 2) there might be a local event in your area to attend. Locations are listed here . For all 6 continents...
The Activity Designer
VS, DTE, COM and COMException, Part 2 – PreserveSig (:-P)
Posted
over 3 years ago
by
tilovell09
0
Comments
Part 1 is here . At the end of Part 1, I’ve decided it’s time to try this COM Message Filter thing out. Implementing the IMessageFilter interface and registering the message filter turns out to be not hard at all, because really, in our case the message...
The Activity Designer
Customizing Commands in Workflow Designer, for Custom Activities in VS
Posted
over 3 years ago
by
tilovell09
0
Comments
(Note: The previous article on customizing commands for a rehosted Workflow Designer is here . It is probably better to go that way if you are only shipping designers in rehosted scenarios.) Due to another forum thread on customizing command behavior...
The Activity Designer
ContextBoundObject – Part #1 – Making Contexts
Posted
over 2 years ago
by
tilovell09
0
Comments
[Deviation from WF posting again.] Sometimes you learn enough about something just well enough to write some code that is useful. A month later, you wake and say… ‘but I still don’t really feel like I know what is going on.’ Today is such a day to clear...
The Activity Designer
Getting MDBG running on .net 4.0 framework
Posted
over 2 years ago
by
tilovell09
0
Comments
MDBG is, briefly, a sample managed library for writing debuggers which uses COM interop and the CLR hosting debugger APIs ( ICorDebug interface etc.). As far as I can find, the most recent version of the MDB sample is still the .net 2.0 version, which...
The Activity Designer
ContextBoundObject – #2 – Contexts and Interception
Posted
over 2 years ago
by
tilovell09
0
Comments
For background: in ContextBoundObject #1 – Creating Contexts we started reverse engineering SynchronizationAttribute to figure out how to create Contexts for ContextBoundObjects . Creating a Context was fairly easy and… on it’s own useless. Yes, a context...
The Activity Designer
(WF4) Custom Rules for Diffing XAML Files
Posted
over 2 years ago
by
tilovell09
0
Comments
Link - “TFS and WF4- The diff noise problem” - I just saw this post from Rory which looked useful for anyone using WinMerge (it’s free). Of course not everyone uses the same diff tools. I’m rather partial to SourceGear|DiffMerge (also free), which...
The Activity Designer
(WF4) ModelItem, ModelItemImpl and ICustomTypeDescriptor
Posted
over 2 years ago
by
tilovell09
0
Comments
[Update 08/03/11: fixed a few horrible proofreading issues which slipped past my nonexistant editor] Today we’re going to explore some internal workings of ModelItem - or really its concrete subclass ModelItemImpl. ModelItemImpl is an internal...
The Activity Designer
ICollectionViewFactory might not get called unless it’s IEnumerable
Posted
over 2 years ago
by
tilovell09
0
Comments
I got lost in some circle of WPF hell this afternoon. Eventually I started wondering if using ICollectionViewFactory to instantiate a collection view would be the cure to all my problems. However, I found myself banging my head against brick walls just...
The Activity Designer
Observable Collection Projections (Synchronized MVVM Collections)
Posted
over 2 years ago
by
tilovell09
0
Comments
(Category: Rambling) Sometimes it’s funny how the same simple problem comes up over and over again, and people immediately solve it over and over again. Of course usually I only notice it when I am one of those people. Some time back I found myself writing...
The Activity Designer
[Windows, C#] Splitting/Forking/Cloning Standard Output
Posted
over 2 years ago
by
tilovell09
0
Comments
For one of my little projects at work, I’ve been creating a utility which will run as a child process which is just hosted as a console application. It prints a lot of output to console, and it would be kinda useful to be able to capture all the output...
The Activity Designer
April 12th - the big day has arrived!
Posted
over 3 years ago
by
tilovell09
0
Comments
Yes, we’re finally shipping Visual Studio 10! Listening to the launch live .
The Activity Designer
Link: WCF and WF Samples Updated for VS 10 release
Posted
over 3 years ago
by
tilovell09
0
Comments
I may need to update some earlier blog posts, but in the meantime you can find the latest WF4 and WCF4 samples (with sample bugs fixed) to download here . (Also - WCF samples readme doc is here and WF samples readme doc is here .)
The Activity Designer
Fixing: An Activity Designer for InvokeAction<T>
Posted
over 3 years ago
by
tilovell09
0
Comments
Something that I had as a blog post was almost useful to someone. Almost, except for all the rough edges. So here is a second release of the post ‘An Activity Designer for InvokeAction
’......
The Activity Designer
Getting Your Workflow Instance
Posted
over 3 years ago
by
tilovell09
0
Comments
There are a few things I feel like I should be able to do inside of a NativeActivity, but can’t - easily. Luckily, there is a way. #1 – Resuming bookmarks – where is my workflow Instance? You can resume a bookmark from within NativeActivity.Execute()...
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