Listpicker和返回值

Question

我是這種語言的新手用戶。我讀這如何做 http://windowsphonegeek.com/articles/listpicker-for-wp7-in-depth 但我仍然有這樣的疑問：

// Constructor 
    public MainPage() 
    { 
     InitializeComponent(); 
     List<SampleData> dataSource = new List<SampleData>(); 
     dataSource.Add(new SampleData() { Day = "Sunday"}); 
     dataSource.Add(new SampleData() { Day = "Monday"}); 
     dataSource.Add(new SampleData() { Day = "Tuesday"}); 
     dataSource.Add(new SampleData() { Day = "Thirsday"}); 
     dataSource.Add(new SampleData() { Day = "Wednesday"}); 
     dataSource.Add(new SampleData() { Day = "Friday" }); 
     dataSource.Add(new SampleData() { Day = "Saturday"}); 
     this.listPicker.ItemsSource = dataSource; 
    } 

    public class SampleData 
    { 
     public string Day { get; set; } 
       } 

我創建了一個listpicker和我插入值，現在我創建這個按鈕1：

private void button1_Click(object sender, RoutedEventArgs e) 
{ 
    String s; 
    s=(String)listPicker.SelectedItem; 
    MessageBox.Show(s);  
} 

我不有一天選擇，但一個無效的轉換錯誤，我不知道返回值選擇。 你能幫我嗎？

Answer 1

您將SampleData放入ListPicker。如果你想'Day'屬性，你應該使用

private void button1_Click(object sender, RoutedEventArgs e) 
    { 
var sampleData =(SampleData)listPicker.SelectedItem; 
var day = sampleData.Day; 
MessageBox.Show(day);  
}