CODEWITHSUNDEEP
c#wpfbinding
FetFrumos
FetFrumos

Reputation: 5964

Binding for nested data

I have a class

public class MyData
{
    public string Caption { get; set; }
    public List<Data1> ListData1 {get; set;}
}

public class Data1
{
    public string FirstName { get; set; }
    public List<Data2> ListData2 { get; set; }
}

public class Data2
{
    public string LastName { get; set; }
}

data must be displayed in the following form

enter image description here

I do so - to link an MyData ListBox filled with data. For him, pointing DataTemplate, bring the code 

            <!--  MyData  -->
            <Grid Grid.Column="0">

                <Grid.RowDefinitions>
                    <RowDefinition />
                </Grid.RowDefinitions>

                <TextBlock Grid.Row="0" Text="{Binding Caption}" />

            </Grid>

            <!--  Data1  -->
            <ListBox 
                     Grid.Column="1"
                     DisplayMemberPath = "FirstName"
                     ItemsSource="{Binding ListData1 }" />
            <!--  -->        

            <!--  Data2  -->
            <ListBox x:Name="lbData2"
                     Grid.Column="2"
                     DisplayMemberPath = "LastName"
                     ItemsSource="{Binding ????}" />

        </Grid>
    </DataTemplate>

How to Make Binding for lbData2? ListData1.ListData2 option does not work.

Upvotes: 3

Views: 133

Answers (2)

Sheridan
Sheridan

Reputation: 69985

I believe that you can just use the following binding syntax:

ItemsSource="{Binding ListData1/ListData2}"

This means bind to the ListData2 property of current or selected instance of ListData1.

You can find out more from the Binding.Path Property page at MSDN.

Upvotes: 1

Bill Zhang
Bill Zhang

Reputation: 1939

If you do not want to change anything in ViewModel, you can do this on XAML only:

<!--  Data1  -->
        <ListBox x:Name="firstNamelbx"
                 Grid.Column="1"
                 DisplayMemberPath = "FirstName"
                 ItemsSource="{Binding ListData1 }" />
        <!--  -->        

        <!--  Data2  -->
        <ListBox x:Name="lbData2" Grid.Column="2"
                 DataContext="{Binding Path=SelectedItem, ElementName=firstNamelbx}"
                 DisplayMemberPath = "LastName"
                 ItemsSource="{Binding ListData2}" />

I think the better way is either you add a SelectedFirstName property in view model and bind it with first name list box's selected item, or use ICollectionView instead of List and sync its CurrentItem with first name list box.

Upvotes: 1

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