Data Binding or DataContext issue when binding a ListView from multiple sources

Question

I cant quite figure out how to bind my list view to both properties in my ViewModel and a list in my view model.

Is it possible to override the ListViews ItemsSource and bind a Checkbox within the ListView straight to the parent ViewModel?

Something like this...

        <ListView ItemsSource="{Binding Path=SomeListInViewModel}">
            <ListView.View>
                <GridView>
                    <GridViewColumn>
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <DockPanel>
                                    <CheckBox 
                                        IsEnabled="{Binding SomePropertyInViewModel}" 
                                        IsChecked="{Binding SomePropertyInsideListObj, Mode=TwoWay}" />
                                </DockPanel>
                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>

I don't think this is possible citing this post: stackoverflow.com/questions/5412797/… — baileyswalk
– baileyswalk, Commented May 28, 2013 at 10:34

dtm · Accepted Answer · 2013-05-23 17:00:58Z

3

there are two possible ways:

1) name the ListView

<ListView x:Name="MyListView" ItemsSource="{Binding Path=SomeListInViewModel}">

and then use the ElementName property on the binding

IsEnabled="{Binding ElementName=MyListView, Path=Whatever}"

2) use RelativeSource in the binding

IsEnabled="{Binding Path=Whatever, RelativeSource={RelativeSource AncestorType={x:Type ListView}}}"

in both cases, if your view model is set as the DataContext of the ListView, the path would look something like DataContext.SomePropertyInViewModel.

answered May 23, 2013 at 17:00

dtm

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5 Comments

baileyswalk Over a year ago

Not sure that I follow you... I can get the list obj to bind to my view OK using the ItemsSource, what I cannot do is set the IsEnabled property to a value on my VM as it goes straight to the list property. The VM is the data context of the window, I'm using the MVVMLight framework.

dtm Over a year ago

What you need to be aware of is the "Source" part of a binding. ItemsControls set the DataContext property of each item, and, in the absence of any other source specification, bindings use DataContext as their source. What I've outlined above are two different ways of specifying the source. What can I clarify for you?

dtm Over a year ago

also, the end of this how-to has a pretty good description of the different options for specifying a binding source. msdn.microsoft.com/en-us/library/ms746695.aspx

baileyswalk Over a year ago

Thanks, this helped. As I am using MVVMLight the Locator is used as the VM's dataContext I Just had to do something like: IsEnabled="{Binding ViewModel.Property, Source={StaticResource Locator}}"

brianestey Over a year ago

@baileyswalk Thanks for the tip. Your comment helped me fix my issue too.

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