获取组合框选择项

Question

I'm binding to a combobox an ObservableCollection of my custom class File . I've created a particular object of type File called SelectedFile . The problem is that in the binding showed below, SelectedFile doesn't change. It's properly initialized, and the binding is working correctly because I can see the objects of the collection in the combobox.

<ComboBox x:Name="combo" Width="150" Margin="5"
                              ItemsSource="{Binding LoadedFiles}"
                              SelectedItem="{Binding SelectedFile}"
                              DisplayMemberPath="Filename">

Previously I had a template for the items, but I removed it since I've read that you need additional stuff to make this work with a template. Is something wrong or I'm missing something?

Answer 1

You can try to set the UpdateSourceTrigger of the SelectedItem to PropertyChanged:

<ComboBox x:Name="combo" Width="150" Margin="5"
                          ItemsSource="{Binding LoadedFiles}"
                          SelectedItem="{Binding SelectedFile, UpdateSourceTrigger=PropertyChanged}"
                          DisplayMemberPath="Filename">

Answer 2

I figured out what was happening: the initialization of the command. I was passing as arguments the initial (empty) selected file. I removed that and everything is working now. Thanks.