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使用MVVM我使用MVVM模式,我想,當我嘗試添加問題與WP7
_friends.Add(new Model.Friends { MyBoxID = e.RosterItem.Jid, MyBoxName = e.RosterItem.Name, Status = Matrix.Xmpp.PresenceType.unavailable })
它給InvalidCastException的,所以我綁定一個現在
public ObservableCollection Friends property to LongListSelector<toolkit:LongListSelector ItemsSource="{Binding Friends}" GroupHeaderTemplate="{StaticResource movieGroupHeader}" ListHeaderTemplate="{StaticResource movieListHeader}"> <toolkit:LongListSelector.ItemTemplate> <DataTemplate> <Grid Margin="12,8,0,8"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <StackPanel Grid.Column="1" VerticalAlignment="Top"> <TextBlock Text="{Binding MyBoxName}" Style="{StaticResource PhoneTextLargeStyle}" FontFamily="{StaticResource PhoneFontFamilySemiBold}" Margin="12,-12,12,6"/> <TextBlock Text="{Binding MyBoxID}" Style="{StaticResource PhoneTextNormalStyle}" TextWrapping="Wrap" FontFamily="{StaticResource PhoneFontFamilySemiBold}"/> <StackPanel Orientation="Horizontal"> <TextBlock Text="Status:" Style="{StaticResource PhoneTextSmallStyle}"/> <TextBlock Text="{Binding Status}" Style="{StaticResource PhoneTextSmallStyle}" FontFamily="{StaticResource PhoneFontFamilySemiBold}"/> </StackPanel> </StackPanel> </Grid> </DataTemplate> </toolkit:LongListSelector.ItemTemplate> </toolkit:LongListSelector>
問題是有約束力的ItemSource嘗試List而不是ObservableCollection。現在我沒有得到例外,但在LLS中沒有顯示任何內容。我怎樣才能綁定我的ObservableCollection屬性LLS與分組。