habe ich eine Favoritenliste Feld, in dem der Benutzer Text von Textblock
in MainPage.xaml
Keine Wiederholung von Werten in der Liste (C#)
<StackPanel Grid.Row="0" Grid.Column= "0" HorizontalAlignment= "Left" VerticalAlignment= "Top" >
< Button x:Name= "FavoriteButton" FontFamily= "Segoe MDL2 Assets"
Content= "" BorderBrush= "Transparent" FontSize= "28"
Foreground= "{StaticResource PhoneForegroundBrush}"
Style= "{StaticResource ButtonStyle1}" Click= "FavoriteButton_Click" />
</ StackPanel >
<StackPanel Grid.Row="0" Grid.Column= "2" HorizontalAlignment= "Left" VerticalAlignment= "Top" >
< Button x:Name= "FavoriteListButton" FontFamily= "Segoe MDL2 Assets"
Content= "" BorderBrush= "Transparent" FontSize= "28"
Foreground= "{StaticResource PhoneForegroundBrush}"
Style= "{StaticResource ButtonStyle1}" Click= "FavoriteListButton_Click" />
</ StackPanel >
C#
private void FavoriteButton_Click(object sender, RoutedEventArgs e)
{
listobj.Add(new MyData { AnswerName = AnswerTextBlock.Text });
using (IsolatedStorageFileStream fileStream = Settings1.OpenFile("MyStoreItems", FileMode.Create))
{
DataContractSerializer serializer = new DataContractSerializer(typeof(MyDataList));
serializer.WriteObject(fileStream, listobj);
}
}
private void FavoriteListButton_Click(object sender, RoutedEventArgs e)
{
if(FavoriteListBox.Visibility.Equals(Visibility.Collapsed))
{
FavoriteListBox.Visibility = Visibility.Visible;
}
else if(FavoriteListBox.Visibility.Equals(Visibility.Visible))
{
FavoriteListBox.Visibility = Visibility.Collapsed;
}
}
und Listbox
XAML sparen
<StackPanel Grid.Column="1" Grid.Row="0" HorizontalAlignment="Center" VerticalAlignment="Top">
<ListBox x:Name="FavoriteListBox" Visibility="Collapsed"
SelectionChanged="FavoriteListBox_SelectionChanged"
HorizontalAlignment="Stretch"
VerticalAlignment="Top" Opacity="1"
Background="{StaticResource PhoneBackgroundBrush}" Foreground="{StaticResource PhoneForegroundBrush}"
Height="300" Width="250">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Visibility="Visible" x:Name="FavoriteListBoxTextBlock"
FontSize="35" Foreground="Black" Text="{Binding AnswerName}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</StackPanel>
C#
public partial class MainPage : PhoneApplicationPage
{
IsolatedStorageFile Settings1 = IsolatedStorageFile.GetUserStoreForApplication();
MyDataList listobj = new MyDataList();
public MainPage()
{
InitializeComponent();
this.Loaded += MainPage_Loaded;
if (Settings1.FileExists("MyStoreItems"))
{
using (IsolatedStorageFileStream fileStream = Settings1.OpenFile("MyStoreItems", FileMode.Open))
{
DataContractSerializer serializer = new DataContractSerializer(typeof(MyDataList));
listobj = (MyDataList)serializer.ReadObject(fileStream);
}
}
FavoriteListBox.ItemsSource = listobj;//binding isolated storage list data
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
if (Settings1.FileExists("MyStoreItems"))//loaded previous items into list
{
using (IsolatedStorageFileStream fileStream = Settings1.OpenFile("MyStoreItems", FileMode.Open))
{
DataContractSerializer serializer = new DataContractSerializer(typeof(MyDataList));
listobj = (MyDataList)serializer.ReadObject(fileStream);
}
}
}
public class MyData
{
public string AnswerName { get; set; }
}
public class MyDataList : ObservableCollection<MyData> //for storing mydata class items with type of list
{
}
Alle Texte von Textbox
, die einen Text zu isolierten Speicher auf Favoritentaste klicken gehen zeigen. aber es kopiert den gleichen Text noch einmal, selbst wenn dieser Text bereits in der Liste vorhanden ist, also möchte ich, wann auch immer Benutzer auf Lieblingsknopf klicken, sollte es zuerst überprüfen, ob Text bereits in der Liste existiert oder nicht, wenn vorhanden, sollte er ersetzen oder nicht kopieren nochmal. also wie man das macht.
AnswerTextBlock ist TextBlock- wo einige Text, wie man überprüft, ob Text existiert oder nicht in der Listbox –
oder auch beantworten Details
–