how to define events in mvvm model in Silverlight - silverlight-3.0

Question

i have an combox control defined with events in my mainpage.xaml
<Grid x:Name="LayoutRoot">
<ComboBox SelectionChanged="ComboBox_SelectionChanged"></ComboBox>
</Grid>
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
}
now how do we defined events for combox control in mvvm model .
and how do we bind the collection list to combo box. i am using SL 3
thanks
prince

Answer 1

In your xaml, you can bind the ItemSource and SelectedItem as shown below:
MainPage.xaml
<UserControl x:Class="App1.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:App1"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<UserControl.DataContext>
<local:MainPage_ViewModel/>
</UserControl.DataContext>
<Grid x:Name="LayoutRoot" Background="White">
<ComboBox ItemsSource="{Binding MyItems}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" SelectionChanged="ComboBox_SelectionChanged" Height="30" Width="100"/>
</Grid>
In the MainPage.xaml.cs, your Selection changed method could just call the method on your ViewModel since you are using SL3:
MainPage.xaml.cs
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
private MainPage_ViewModel viewModel
{
get { return this.DataContext as MainPage_ViewModel; }
}
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
this.viewModel.SelectionChanged();
}
}
Your ViewModel would have the MyItems collection and the SelectedItem to bind to:
MainPage_ViewModel.cs
public class MainPage_ViewModel : INotifyPropertyChanged
{
public ObservableCollection<string> MyItems
{
get { return myItems; }
set { myItems = value; }
}
private ObservableCollection<string> myItems = new ObservableCollection<string>() { "One", "Two", "Three" };
public string SelectedItem
{
get { return selectedItem; }
set { selectedItem = value; }
}
private string selectedItem = string.Empty;
public void SelectionChanged()
{
//Perform logic that needs to happen when selection changes
}
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
Depending on what you were using your SelectionChanged method for, you may no longer need it since this would bind the SelectedItem to the ViewModel.
Hope this helps!