如何从选定的项目ListPicker Windows Phone 8.1 Silverlight获取内容文本？

Question

I have a problem here to take the text from selected item inside of my ListPicker,i found this code who allows me to do that

var content = ((ListPickerItem)CursoLista.SelectedItem).Content;

and my XAML:

<toolkit:ListPicker x:Name="CursoLista" Header="Curso" ItemsSource="{Binding}">
                    <toolkit:ListPicker.ItemTemplate>
                        <DataTemplate>
                            <StackPanel>
                                <toolkit:ListPickerItem Content="{Binding Curso}"/>
                            </StackPanel>
                        </DataTemplate>
                    </toolkit:ListPicker.ItemTemplate>
                </toolkit:ListPicker>

as you can see,the content is Binding to a List from my server:

private void Cliente_ProfessorRetrieveCompleted(object sender, Service.ProfessorRetrieveCompletedEventArgs e)
    {

        CursoLista.ItemsSource = e.Result;

but when i try to do this,i have an Execption :

Additional information: Unable to cast object of type 'FaculdadeGuararapes.Service.ListaProfessor' to type 'Microsoft.Phone.Controls.ListPickerItem'.

FaculdadeGuararapes.Service.ListaProfessor its the list who comes from my WebServer!

Answer 1

First of all, if your e.Result is a list of strings and you set CursoLista.ItemsSource from code behind, you don't need to add ItemsSource in xaml. Next, if you want to retreive single selected item, just pin to SelectionChanged event. Additionally, probably it's not necessary to add <DataTemplate> . DataTemplate is only necessary when you want to customize a layout or bind to the class.

<toolkit:ListPicker x:Name="CursoLista" Header="Curso" SelectionChanged="CursoLista_SelectionChanged">
</toolkit:ListPicker>

and handle it in code behind:

    private void CursoLista_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
         string selectedString = (sender as ListPicker).SelectedItem as string;
    }