Selecting an item in ComboBox in WPF to do an action

I'm trying to initiate an action based on a selection in a开发者_StackOverflow ComboBox I created in WPF. I'm pretty new to WPF and C#. My ComboBox has

<ComboBox x:Name="SampleComboBox" Width="100" ItemsSource="{Binding Path=NameList}" />

Where NameList is a List property in the code behind. Now I want to generate an action based on the selection in the ComboBox and not sure where to start. Thanks.

You'll need to add a method to handle the SelectionChanged event. You can either do this in code:

this.MyComboBox.SelectionChanged += new SelectionChangedEventHandler(OnSelectionChanged);

or in XAML:

<ComboBox x:Name="SampleComboBox" Width="100" 
ItemsSource="{Binding Path=NameList}" SelectionChanged="OnSelectionChanged" />

where you can then do something with the selected items:

private void OnSelectionChanged(object sender, SelectionChangedEventArgs e) 
{
     ComboBoxItem cbi = (ComboBoxItem) (sender as ComboBox).SelectedItem;
}

You can get the selected object by writing SampleComboBox.SelectedItem.
This will return an instance of an item in your source list.

Are these a finite set of values in this NameList that is the ItemsSource for this?

Why not amend that xaml to read:

<ComboBox x:Name="SampleComboBox" Width="100" SelectedItem="{Binding TheItem}" ItemsSource="{Binding Path=NameList}" />

and then in your ViewModel for this, have something like:

public static readonly DependencyProperty TheItemProperty=
    DependencyProperty.Register("TheItem", typeof(string), typeof(OrderEditorViewModel), 
        new PropertyMetadata((s, e) => {
            switch (e.NewValue) {
                case "SomeValue":
                    // Do something
                    break;
                case "SomeOtherValue":
                    // Do another thing
                    break;
                default:
                    // Some default action
                    break;
             }
     }));

public string TheItem{

  get { return (string)GetValue(TheItemProperty); }
  set { SetValue(TheItemProperty, value); }
}

You can do your actions based on the selection in that switch statement which will be invoked whenever the selection is changed.