WPF列表框使用模板添加项目

Question

I searched everywhere but I didn't found any good example or tutorial for this. I have a listbox and I made an ItemTemplate for it:

XAML :

  <ListBox x:Name="LB_Playlist" ScrollViewer.HorizontalScrollBarVisibility="Disabled" HorizontalAlignment="Left" Height="454" Margin="0,23,0,0" VerticalAlignment="Top" Width="264" Background="{x:Null}" BorderBrush="{x:Null}" BorderThickness="0" ItemTemplate="{DynamicResource PlayListItem}" ScrollViewer.VerticalScrollBarVisibility="Hidden">
            <ListBox.Resources>
                <DataTemplate x:Key="PlayListItem">
                    <Grid d:DesignWidth="127" d:DesignHeight="105" Width="128" Height="128">
                        <Label x:Name="L_PlayListName" Content="{Binding Path=PlayList_Name}" HorizontalAlignment="Stretch" Margin="16" Width="Auto" Height="Auto" Background="#26000000" Padding="0" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" FontFamily="BankGothic Lt BT"/>
                    </Grid>
                </DataTemplate>
            </ListBox.Resources>
  </ListBox>

How can I add a new Item using code (dynamic) changing L_PlayListName content everytime with different name? I need to make a new class or something? I have a button to add new Item. How can I do this?

Answer 1

First create a collection property in your code behind:

public ObservableCollection<string> PlayListNames { get; set; }

Then Bind this to the ListBox.ItemsSource :

<ListBox ItemsSource="{Binding PlayListNames}" ... />

Change your XAML slightly:

<Label x:Name="L_PlayListName" Content="{Binding}" />

This will Bind to the whole value provided to each item and in this case, that means one of the string values from the collection.

Finally, just set your DataContext of your Window . There are several ways to do this and the easiest (but not best) is to do this in your MainWindow.xaml.cs constructor:

DataContext = this;

That's it... let me know if you have any problems.

Answer 2

<Grid x:Name="LayoutRoot">
    <ListBox Margin="10" ItemsSource="{Binding}"/>
</Grid>

in front of Binding u can write name of table's column (table of database)

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    BindData();          
}

private void BindData()
{
    DataSet dtSet = new DataSet();
    using (connection = new SqlConnection(connectionString))
    {
        command = new SqlCommand(sql, connection);              
        SqlDataAdapter adapter = new SqlDataAdapter();          
        connection.Open();
        adapter.SelectCommand = command;
        adapter.Fill(dtSet, "Customers");
        listBox1.DataContext = dtSet;

    }
}

Answer 3

O'k if your just adding strings to your playlist you should edit the template to the following

  <DataTemplate x:Key="PlayListItem">         
     <Label x:Name="L_PlayListName" Content="{Binding}" />           
  </DataTemplate>

But you should use an ObservableCollection and make it easy and correct .