Combobox in datagrid using sortable collection

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I am using silverlight DataGrid. DataSource for the DataGrid is SortableCollection.
Grid contains ComboBox in TemplateColumn, using DataContext data is added to combobox.

In Grid_LoadingRow event we are doing the following:
lcmb is combobox.
lControlDs is DataSource.

lCmb.ItemsSource = lControlDS.cDataSourceRowCollection;
lCmb.SelectedValuePath = "[" + lControlDS.lObjControlMappingInfo.SelectedValuePath + "]";

Binding lBinding = new Binding();
lBinding.Source = e.Row.DataContext;

lBinding.Path = new PropertyPath("[" + lControlDS.lObjControlMappingInfo.cControlPropertyMapping[0].RefPropertyName + "]");

lBinding.Mode = BindingMode.TwoWay;
lCmb.SetBinding(ComboBox.SelectedValueProperty, lBinding)

The problem is, on adding a row to SortableCollection as expected Row gets added to DataGrid, but on selecting value from single ComboBox, for all other ComboBoxes in same TemplateColumn same value gets selected.
I short, single selection is affecting all the other comboboxes.

How to handle this problem, and manage to select/show different value in other comboboxes?

Posted 29-Jul-12 19:30pm

sant.rajas

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Erik Rude 30-Jul-12 7:44am

I remember having a similar issue some years back in WPF. It has to do with how the Template is being applied. I can't quite remember how It was fixed. I'll see if I can find it somewhere in the back of my mind.
Is this a problem only after you add a new row - or also before?

sant.rajas 30-Jul-12 10:11am

Initially there is just one row in DataGrid, so the problem is not evident at this point. But when I add a new row, problem arises.

I cant check whether problem exists or not with only single row is present in datagrid, So I am assuming that problem occurs when new row is added.

Erik Rude 31-Jul-12 4:44am

See if you can make a small project that has just a grid with the same or similar layout with more than one row in. (I assume this is the same in WPF as in Silverlight). If you can replicate in a small sized project it may be easier to solve and get help. I'll see what I can dig out from old projects. Please tell the version of VS and Silverlight.

Erik Rude 31-Jul-12 4:47am

Please also share the XAML definition of your grid (if it exists in XAML

sant.rajas 31-Jul-12 5:05am

I used two comboboxes placed outside the datagrid, with same DataSource assigned to both. In this case also I faced similar problem. So I think the problem is not with DataGrid but with use of multiple ComboBoxes and single DataSource.

sant.rajas 31-Jul-12 5:05am

I have submitted the XAML code for DataGrid.

Erik Rude 31-Jul-12 5:18am

You should use the Improve Question button instead of supplying a Solution I guess.

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sant.rajas · Answer 1 · 2012-07-30T23:02:00

Hi erik

CODE FOR XAML :

<sdk:datagrid autogeneratecolumns="False" height="100" horizontalalignment="Left" margin="75,80,0,0" name="dataGrid1" verticalalignment="Top" width="231" loadingrow="dataGrid1_LoadingRow" xmlns:sdk="#unknown">
          <sdk:datagrid.columns>
              <sdk:datagridtextcolumn canuserreorder="True" canuserresize="True" canusersort="True">
                                      Header="Sr.No" Width="2*"  Binding="{Binding Path=[ServiceRqstDetailRowId]}"  />

              <sdk:datagridtemplatecolumn header="Service Name">
                  <sdk:datagridtemplatecolumn.celltemplate>
                      <datatemplate>
                          <combobox x:name="cmbService" xmlns:x="#unknown">
                              <combobox.itemtemplate>
                                  <datatemplate>
                                      <textblock x:name="txtServiceName" text="{Binding Path=[ServiceShortName]}" />
                                  </datatemplate>
                              </combobox.itemtemplate>
                          </combobox>

                      </datatemplate>
                  </sdk:datagridtemplatecolumn.celltemplate>
              </sdk:datagridtemplatecolumn>

          </sdk:datagridtextcolumn></sdk:datagrid.columns>
      </sdk:datagrid>

Erik Rude · Answer 2 · 2012-07-30T23:27:00

Ok Sant, I think this is what I've got and what I can get:
My issue actually was in a ListView, but I still think it would apply.
I ended up with the following working XAML

HTML

<gridviewcolumn header="Gravity Model ID" displaymemberbinding="{Binding Path=GravityModel.Definition.IDGravityModel}" /><gridviewcolumn header="Gravity Model">
<gridviewcolumn.celltemplate>
    <datatemplate>
      <combobox name="cbxGravityModels" itemssource="{Binding Path=GravityModels}">
        SelectedValuePath="Definition.IDGravityModel"
        SelectedValue="{Binding Path=GravityModel.Definition.IDGravityModel}" 
        DisplayMemberPath="Definition.Name">
      </combobox>
    </datatemplate>
  </gridviewcolumn.celltemplate>
</gridviewcolumn>

I think part of you problem could be the second datatemplate - or more likely as you suggested: The problem may lie in using the same source for two different comboboxes one of which is not in the grid template leading to a selection in one reflecting in them all.
This is my shot - hope you sort it out.
Cheers
Erik

Combobox in datagrid using sortable collection

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