SilverlightShow: A simplified DataForm replacement - Part 2 Adding validation support Comments

Validation on Cancel

wizardnet — Sat, 08 Jan 2011 16:28:36 GMT

Hello Andrea,

I observed a small problem when canceling the form, the validation still occurs, I guess because

if (!this.ValidateItem())
return;

if (string.Compare(commandName, Form.CommitCommand, StringComparison.OrdinalIgnoreCase) == 0){
this.OnCommit();
}
else if (string.Compare(commandName, Form.CancelCommand, StringComparison.OrdinalIgnoreCase) == 0)
this.OnCancel();

I think the validation part shall be put only inside the Commit if, just before the this.OnCommit.

right?

RE: A simplified DataForm replacement - Part 2 Adding validation support

Andrea Boschin — Fri, 03 Sep 2010 18:00:21 GMT

I also noticed the behavior you describe but I didn't have the time to investigate the issue. I figure out the DataForm scans the fields after the are rendered and make the alignment someway.

Thanks for your message.

RE: A simplified DataForm replacement - Part 2 Adding validation support

PeterUstinof — Fri, 03 Sep 2010 17:38:59 GMT

Great article.

But the standard DataForm controls align the label and the textbox in a nice way (labels has got all the same width), whereas your solution it looks a bit flattered.

I've no idea, how I could solve this. "SharedSizeGroup" seems not to be possible in silverlight.

Thanks

Peter

RE: A simplified DataForm replacement - Part 2 Adding validation support

razor — Tue, 27 Jul 2010 05:30:58 GMT

I had this exact problem and solved it in a much simpler and less complex way. First, the dataform is just fine however it does need a little push in the MVVM drection. I solved mine with a behavior that exposes two things. A ValidateAndCommit command and a EditComplete event. Simply tell any control to call the command on the the behavior and wire any event handler you want to the EditComplete event on the behavior and your done. What are the advantages? You don't need a custom control so all your themes will still work. Any control can call the command as it normally would. It can be dragged on your dataform in blend and wired up. Your still using the dataform and should it even support these things like it should have you can throw away the behavior and keep rockin...

RE: A simplified DataForm replacement - Part 2 Adding validation support

Andrea Boschin — Fri, 07 May 2010 16:55:12 GMT

thank you all for the feedbacks. It's good to know my work is useful. bye.

RE: A simplified DataForm replacement - Part 2 Adding validation support

mbrig — Fri, 07 May 2010 16:50:43 GMT

Thank you Semkaa for the help. The build action had to be set to Resource. Problem solved! Thanks again to Andrea for a great article. This will be a great addition to our project.

RE: A simplified DataForm replacement - Part 2 Adding validation support

mbrig — Thu, 06 May 2010 16:39:56 GMT

i agree, great article. i am having the same problem though. gettemplatechild returns null. if the problem is in generic.xaml. how can this be solved?

RE: A simplified DataForm replacement - Part 2 Adding validation support

Andrea Boschin — Sun, 07 Mar 2010 10:19:22 GMT

Good to know you have solved you issue. Thanks.

RE: A simplified DataForm replacement - Part 2 Adding validation support

Semkaa — Sun, 07 Mar 2010 03:40:36 GMT

Fixed that, it was all about generic.xaml.

Andrea, thanks again for great job.

RE: A simplified DataForm replacement - Part 2 Adding validation support

Semkaa — Sun, 07 Mar 2010 03:08:57 GMT

Great article. Thanks. This is exactly what I need.

But I can't embed this control into my project.

I made a page like yours MainPage.xaml, but in OnApplyTemplate() method GetTemplateChild() returns null, which makes impossible further control initialization.