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[英]How to get the selecteditem from a listpicker as string in c# for windows phone application
[英]LongListSelector C# - How to get SelectedItem as string from grouped data list - Windows Phone Silverlight 8.1
我正在用C#構建我的第一個WP Silverlight 8.1應用程序,所以還是個新手!
我的應用程序中有一個LongListSelector,它允許用戶選擇一個房間。 當用戶點擊房間時,我希望房間名稱(例如“ N01”,“ N07”,“ N12”-參見下面的代碼!)存儲為字符串。
我將房間存儲在一個分組的列表中-列表“ dataSource”綁定到LongListSelector(順便說一句稱為“ longListSelectorState”)。
這是我的清單的C#代碼:
namespace WPLongListSelectorDemo
{
public partial class MainPage : PhoneApplicationPage
{
List<RoomList> dataSource;
// Constructor
public MainPage()
{
InitializeList();
InitializeComponent();
List<RoomGroup<RoomList>> DataSource = RoomGroup<RoomList>.CreateGroups(dataSource,
System.Threading.Thread.CurrentThread.CurrentUICulture,
(RoomList s) => { return s.RoomName; }, true);
longListSelectorState.ItemsSource = DataSource;
// Sample code to localize the ApplicationBar
//BuildLocalizedApplicationBar();
}
private void InitializeList()
{
dataSource = new List<RoomList>();
//North Rooms - Classrooms
dataSource.Add(new RoomList("N01", "North"));
dataSource.Add(new RoomList("N02", "North"));
dataSource.Add(new RoomList("N03", "North"));
dataSource.Add(new RoomList("N04", "North"));
dataSource.Add(new RoomList("N05", "North"));
dataSource.Add(new RoomList("N06", "North"));
dataSource.Add(new RoomList("N07", "North"));
dataSource.Add(new RoomList("N08", "North"));
dataSource.Add(new RoomList("N09", "North"));
dataSource.Add(new RoomList("N10", "North"));
dataSource.Add(new RoomList("N11", "North"));
dataSource.Add(new RoomList("N12", "North"));
dataSource.Add(new RoomList("N13", "North"));
dataSource.Add(new RoomList("N14", "North"));
dataSource.Add(new RoomList("N15", "North"));
dataSource.Add(new RoomList("N16", "North"));
dataSource.Add(new RoomList("N17", "North"));
dataSource.Add(new RoomList("N18", "North"));
dataSource.Add(new RoomList("N19", "North"));
dataSource.Add(new RoomList("N20", "North"));
dataSource.Add(new RoomList("N21", "North"));
列表實際上比這更長,但是我在這里將其縮減了一些。 列表中有100多個元素。
我嘗試使用以下代碼從列表中獲取SelectedItem,然后在消息框中顯示它。
private void longListSelectorState_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var selectedRoom = longListSelectorState.SelectedItem;
MessageBox.Show(selectedRoom.ToString());
}
但是消息框僅顯示“ WPLongListSelectorDemo.RoomList”作為SelectedItem。 WPLongListSelector是名稱空間,RoonList是列表名稱,所以我想這很有意義,但這不是我想要的! 例如,我要說“ N01”。
如何從列表中以字符串形式獲取實際房間,作為SelectedItem?
謝謝!
我不知道確切的分組列表是什么,但是如果您的RoomList類看起來像這樣:
internal class RoomList
{
public string Location { get; set; }
public string ClassNumber { get; set; }
}
然后創建一個新的RoomList實例
RoomList selectedRoom = new RoomList()
{
Location = "north",
ClassNumber = "n01"
}
並調用selectedRoom .ToString()會得到“ WPLongListSelectorDemo.RoomList”,因為您將類型本身轉換為字符串(返回名稱空間和類型名稱),而不是實例selectedRoom的string屬性。
相反,您應該這樣做:
MessageBox.Show(selectedRoom .Location.ToString())
要么
MessageBox.Show(selectedRoom.ClassNumber.ToString()).
(在這種情況下,您甚至不需要ToString(),因為Location和ClassNumber都是字符串。)
您還可以覆蓋RoomList的ToString()方法:
internal class RoomList
{
public string Location { get; set; }
public string ClassNumber { get; set; }
public override string ToString()
{
return Location + ", " + ClassNumber;
}
}
在這種情況下,selectedRoom.ToString()將返回“ north,n01”。
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