Quick research on the idea of aspectize databinding support
I did a quick research on the idea of aspectize databinding support (see my previous post http://survic.blogspot.com/2006/09/can-we-use-aop-to-mix-in-databining.html#links)
I googled "databinding and nhibernate". (why? because I knew hibernate is pure OO. To make it to support databinding, you either add that via code generation, or, using aop.
I could just google “aspect and databinding” – somehow, I googled nhibernate first. I guess I feel a concrete solution is more searchable than an abstract concept – Later, I did the latter also, same result.
http://chanwit.blogspot.com/
I will put more thoughts in my comments.
posted by survic at
5:45 PM
10 Comments:
Now, I read all his posts. I got one important info: ObjectViews. So, I googled: "ObjectViews databinding".
Also, I realized that a better way is not using inheritance (not even aop-ed), just a simple wrapper ("shell").
I get a lot of useful links. I am reading them and will post my comments later.
google research is fun -- as long as you know what to search!
After I go through this period of dataset craziness, I will use the ObjectViews approach (perhaps inherit BindingSource) or aop-mix-in approach (as long as we have control of the Factory for those object lists for the UI controls, the latter is less intrusive).
The following is my post to:
http://sourceforge.net/forum/forum.php?forum_id=420090
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I am new here. I knew ObjectViews just a few hours ago. However, I read all posts in
http://sourceforge.net/news/?group_id=123313
http://jira.nhibernate.org/browse/NH-117
http://sourceforge.net/forum/forum.php?forum_id=420090
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I have an idea: how about get some ideas from CSLA? http://www.lhotka.net/
Of course, ObjectViews need to move the logic from the base class to ObjectView, a lot of redirect calls. However, since CSLA is quite mature for .Net20 now; it is a short cut for ObjectViews for .Net 20.
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We need to change the databinding anyway:
http://www.softinsight.com/bnoyes/PermaLink.aspx?guid=64275c83-d7af-4a19-b4f7-593146ab415f
also, Gentle.NET's ObjectView
-- it has minimum custom code.
notes of reading:
http://jira.nhibernate.org/browse/NH-117
---- yes, I am slowly working on it as my relaxing mechanism -- so, mostly reading, and making notes.
What's flattening you ask? What if you need to bind to a list of persistent object, and want to show properties of properties? Flattening will do it.
Example:
IObjectView view = ObjectView.Create(someList, typeof(MyClass), "Name, Age, Group.Name AS Group");
Now bind to view, and you get 3 columns, Name (MyClass.Name), Age (MyClass.Age), and Group (MyClass.Group.Name). The bound objects will be of type IObjectRowView, and will carry a reference to the origonal object (in this example, MyClass). This is just like DataRowViews, and thier reference to DataRow.
why CSLA here? because of net20, for example, generics
Do not use the two approaches:
1. changing BindingSource: this can be the next step; but not necessary. objectView should be the first step.
2. object->datatable->dataview: it is too messy.
so, we return the "objectView" approach; to do it in 2.0, we need to borrow CSLA.
so, the real solution of databinding is in custom databinding, which in turn is in
objectview's code and its forum: http://sourceforge.net/forum/forum.php?forum_id=420090 and CSLA.
a post on objectView:
http://sourceforge.net/forum/message.php?msg_id=3987205
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take a look of CSLA, http://forums.lhotka.net/search/SearchResults.aspx?q=flatten
especially its SortedBindingList. Note that using that does not need to use CALA as a whole (I know it is one of the best; but I also feel it is a tough sell to use it as a whole) -- so, IEditableObject is still an issue. It seems that we should add the function to SortedBindingList so that it can handle object without IEditableObject. Also, we need to add more features when it is just a IList (not BindingList with T).
Here is the result:
http://survic.blogspot.com/2006/11/minimalist-custom-class-approach-for.html#links
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