Question

I have encountered a major problem for myself in the learning process of WPF bindings. I have to create an application that uses a Listview which look like this:

<ListView.View>
    <GridView>
        <GridViewColumn Header="ID" Width="75" DisplayMemberBinding="{Binding ID}" />
        <GridViewColumn Header="Name" Width="170" DisplayMemberBinding="{Binding Name}" />
        <GridViewColumn Header="Price" Width="100" DisplayMemberBinding="{Binding Price}" />
        <GridViewColumn Header="Reseller" Width="Auto" DisplayMemberBinding="{Binding Reseller}" />
    </GridView>
</ListView.View>

In the codebehind file I have a property:

public Product seletedRow
{
    get { return m_Product; }
    set { m_Product = value; PropertyChanged("Product"); }
}

The goal would be to set this property to the selected row of the listView and then show the fields of this property in 4 textboxes.
If I set this property manually from code I can display the information in the textboxes but I can’t figure out how to bind the object from the ListView.SelectedItem. As far as I have found I should be using OneWayToSource binding mode but I have no idea how.

I’m also opened to other solutions, as long as I can use it in MVVM pattern.

Answer 1

It’s probably better to do something like this. That way you don’t even need any code-behind.

{Binding ElementName=myListView, Path=SelectedItem.ID, UpdateSourceTrigger=PropertyChanged}

You’ll need to assign ListView a name like this.

<ListView Name="myListView">

It would look something like this.

<ListView Name="myListView">
    <ListView.View>
                <GridView>
                    <GridViewColumn Header="ID" Width="75" DisplayMemberBinding="{Binding ID}" />
                    <GridViewColumn Header="Name" Width="170" DisplayMemberBinding="{Binding Name}" />
                    <GridViewColumn Header="Price" Width="100" DisplayMemberBinding="{Binding Price}" />
                    <GridViewColumn Header="Reseller" Width="Auto" DisplayMemberBinding="{Binding Reseller}" />
                </GridView>
            </ListView.View>
</ListView>

<TextBox Text="{Binding ElementName=myListView, Path=SelectedItem.ID, UpdateSourceTrigger=PropertyChanged}"/>

Edit:

If you wan’t to expand on the logic you probably want to look into using ACB, as with ACB you could do something like this.

acb:CommandBehavior.Event="SelectedItemChanged"
acb:CommandBehavior.Command="{Binding SelectedItemChanged}"
acb:CommandBehavior.CommandParameter="{Binding RelativeSource={RelativeSource Mode=Self}, Path=SelectedItem}"

This would essentially allow you to store the specific SelectedItem each time you choose a new item on the list.

http://marlongrech.wordpress.com/2008/12/13/attachedcommandbehavior-v2-aka-acb/