DataGridListView's SelectedItem null 在MVVM中绑定后 WPF C#

Question

i'm having some troubles with databinding of selecteditem of a datagridlistview. I implemented an event on doubleclick with a command and commandparameter. I'd like to pass as command parameter the row that i double clicked (the selected item).

I tried this:

   <ui:DataGridListView Grid.Row="1" Margin="6" MinHeight="200"
                         Name="PTest"                          
                         ItemsSource="{Binding Source={StaticResource model}, Path=EsecuzioniCollection}"
                         VisibleItems="{Binding Source={StaticResource model}, Path=VisibleItems, Mode=OneWayToSource}">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="MouseDoubleClick">
                <i:InvokeCommandAction CommandParameter="{Binding Source={StaticResource model}, Path= SelectedItem}" Command="{Binding Source={StaticResource model}, Path=MouseDoubleClickCommand}">
                </i:InvokeCommandAction>
            </i:EventTrigger>
        </i:Interaction.Triggers>
        ...............
</ui:DataGridListView>

But when command is invoked the parameter SelectedItem is null:

 public async void MouseDoubleClick(PerimetriTestDataItem item)
    {
        ...
    }

I tried also putting SelectedItem={Binding SelectedItem} on ui:DataGridListView but it's null on my viewmodel.

Is there a way to bind the row? any tricks?

Thank you

Answer 1

Without any other information, I am assuming that SelectedItem is a property inside model , it does not look like SelectedItem in the StaticResource model is bound to anything. I believe you can try one of two steps.

1. Replace i:InvokeCommandAction CommandParameter="{Binding Source={StaticResource model}, Path= SelectedItem}" Command="{Binding Source={StaticResource model}, Path=MouseDoubleClickCommand}"> with i:InvokeCommandAction CommandParameter="{Binding Source={ElementName=PTest, Path=SelectedItem}, Path= SelectedItem}" Command="{Binding Source={StaticResource model}, Path=MouseDoubleClickCommand}">

2. Instead of SelectedItem={Binding SelectedItem} on ui:DataGridListView try SelectedItem={Binding Source={StaticResource model}, Path=SelectedItem}