c# - 列表选择器和返回值

Question

我是这种语言的新手。我读了这个方法 http://windowsphonegeek.com/articles/listpicker-for-wp7-in-depth 但我仍然有这个问题：

 // 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; }
               }

我创建了一个列表选择器并插入了值，现在我创建了这个按钮1：

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

我没有选择日期，但有一个无效的转换错误，我不知道选择的返回值。你能帮助我吗？

Answer 1

你SampleData放入ListPicker. 如果你想要 ' Day' 属性，你应该使用

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