CODEWITHSUNDEEP
wpfcaliburn.micro
David Shochet
David Shochet

Reputation: 5385

Binding to other control's selected value

I have a wpf application using caliburn.micro. It has a datagrid and a combobox.

Here is the DataGrid:

<DataGrid x:Name="TriageMapRecords"
          Grid.Row="0" Grid.ColumnSpan="5"
          AutoGenerateColumns="False"
          BaseControls:DataGridExtension.Columns="{Binding TriageMapRecordColumns}"
          CanUserAddRows="False" IsReadOnly="True"
          SelectedItem="{Binding Path=SelectedTriageMapRecord, Mode=TwoWay}">

SelectedTriageMapRecord object contains a field CounterpartyNameId.

I want to bind selected value in the combobox to CounterpartyNameId of the SelectedTriageMapRecord.

I tried this:

<ComboBox x:Name="RefCounterparties" 
          DisplayMemberPath="Name" SelectedValuePath="Id" 
          SelectedValue="{Binding Source=SelectedTriageMapRecord, 
                                  Path=CounterpartyNameId, Mode=TwoWay}"
          Grid.Row="1" Grid.Column="1" HorizontalAlignment="Left" 
          Width="Auto" MinWidth="100" Margin="3,3,0,3"/>

But this didn't work. Could you tell me what I am missing?

Upvotes: 1

Views: 1280

Answers (1)

Tim
Tim

Reputation: 15237

It looks like you probably want to do it like this:

<ComboBox x:Name="RefCounterparties"  
          DisplayMemberPath="Name" SelectedValuePath="Id"  
          SelectedValue="{Binding SelectedTriageMapRecord.CounterpartyNameId,  
                                  Mode=TwoWay}" 
          Grid.Row="1" Grid.Column="1" HorizontalAlignment="Left"  
          Width="Auto" MinWidth="100" Margin="3,3,0,3"/>

You don't want to set a source because your source is still the DataContext. Then you specify the path on the DataContext to drill down into. In this case, the SelectedTriageMapRecord property of the DataContext, and then the CounterpartyNameId property of the SelectedTriageMapRecord object.

Upvotes: 1

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