Comments on: Silverlight DataGrid – Populate Dynamic Columns from a Child Collection

By: Brian Lagunas

Brian Lagunas — Fri, 16 Jul 2010 17:01:48 +0000

Check out this thread, it may help you with your problem.

http://forums.silverlight.net/forums/p/93093/295874.aspx

By: Ari Weinberger

Ari Weinberger — Fri, 16 Jul 2010 15:34:07 +0000

I hit another brick wall. I need the grid to be editable.
If I use a value converter, I don’t have a reference to the original EntityCollection on ConvertBack.

By: Ari Weinberger

Ari Weinberger — Thu, 15 Jul 2010 17:17:04 +0000

Thanks for the value converter suggestion. It works great!

Thanks again for your help!

By: Brian Lagunas

Brian Lagunas — Thu, 15 Jul 2010 16:34:53 +0000

Without having your code available it is difficult to help. You could try binding to the object and then using a value converter to get the desired result.

Happy coding.

By: Ari Weinberger

Ari Weinberger — Thu, 15 Jul 2010 15:56:11 +0000

Thanks for your reply. I tried the following, but it’s not valid syntax.
I tried both [] and () for the index. () throws an error, while [] doesn’t work.
What am I doing wrong?

Thanks again.

dg.Columns.Add(New DataGridTextColumn With {
.Binding= New Binding(“Periods.ElementAt[0].Hours”)})

By: Brian Lagunas

Brian Lagunas — Thu, 15 Jul 2010 15:10:14 +0000

That is because you cannot apply [] indexing to an EntityCollection. You could try using ElementAt(index).

By: Ari Weinberger

Ari Weinberger — Thu, 15 Jul 2010 05:37:37 +0000

Hi, I tried to implement this with WCF RIA Services that returns an entity with an EntityCollection as one of its properties (the entity is associated with another in a one to many relationship).
The indexer doesn’t seem to work in this case.
If I bind to the .Count, I get the number of items in the collection, so the data is there.

Any suggestions?

By: Brian Lagunas

Brian Lagunas — Wed, 14 Apr 2010 13:40:08 +0000

You could try using a ValueConverter on your edit data template. This will allow you to conditionally set the IsReadOnly property on your TextBox.

By: Pablo

Pablo — Wed, 14 Apr 2010 10:08:29 +0000

Ok, this codes are corrects but after do this, i need disable or not disable one cell if my data is not null or is null,

¿Is this posible?

I played with is read only and IsEnabled of Texbox of datatemplate, and not work, because IsReadOnly disabled all cells of column and textbox is datatemplate for all cell columns do same thing…

You have one idea?

Thanks,

Pablo

By: Brian Lagunas

Brian Lagunas — Tue, 09 Mar 2010 23:44:40 +0000

You are correct, I could accomplish the same thing by writing this:

dataGrid.Columns.Add(new DataGridTextColumn()
{
IsReadOnly = false,
Binding = new System.Windows.Data.Binding(string.Format(“Periods[{0}].Hours”, i)) { Mode = System.Windows.Data.BindingMode.TwoWay }
});

But, this works only only for the DataGrid. If I used any other grid such as the Infragistics XamWebGrid or the DevExpress AgDataGrid, that method would not work. So I wrote this blog post with that in mind, and suggested a method that can work with any grid.