c＃WPF將組合框項添加到列表框

Question

我正在努力使用戶可以從組合框中選擇一個項目，然后按一個按鈕，所選項目將被添加到列表框中。 問題是，一旦我做出選擇並按下按鈕，列表框就會出現故障，水平滾動滑塊彈出並占據整個空間（甚至不知道是否添加了該項目）。

XAML代碼：

<Label Name="UserEntryLabel" Content="Your chosen entries:" Grid.Row="1" Grid.ColumnSpan="2"  Grid.Column="0" HorizontalAlignment="Right" VerticalAlignment="Bottom" FontSize="15" FontWeight="Bold" Foreground="DarkBlue" Margin="0,0,10,8" Padding="0,0,0,0"/>
<ListBox Name="UserEntryBox" Grid.Row="1" Grid.Column="2" HorizontalAlignment="Left" VerticalAlignment="Bottom" Width="120" Height="20" ScrollViewer.VerticalScrollBarVisibility="Visible" Margin="0,0,0,8"/>
<Label Name="NewEntryLabel" Content="Add new entry:" Grid.Row="2"  Grid.Column="0" HorizontalAlignment="Right" VerticalAlignment="Top" FontSize="15" FontWeight="Bold" Foreground="DarkBlue" Margin="0,8,6,0" Padding="0,0,0,0"/>
<ComboBox Name="NewEntryBox" Grid.Row="2" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Top" Width="120" Height="20" Margin="0,8,0,0">
    <ComboBoxItem IsSelected="True">Entry1</ComboBoxItem>
    <ComboBoxItem>Entry2</ComboBoxItem>
    <ComboBoxItem>Entry3</ComboBoxItem>
    <ComboBoxItem>Entry4</ComboBoxItem>
</ComboBox>
<Button Name="NewEntryButton" Content="Add" Grid.Row="2" Grid.Column="2" HorizontalAlignment="left" VerticalAlignment="Top" Width="90" Height="20" Margin="0,8,0,0" Click="NewChestButtonClick"/>

CS代碼：

private void NewCEntryButtonClick(object sender, RoutedEventArgs e)
{
    AddNewEntry();
}

private void AddNewEntry()
{
    ListBoxItem TempItem = new ListBoxItem();
    string EntryType = NewEntryBox.SelectedItem.ToString();
    TempItem.Content = EntryType;
    UserEntryBox.Items.Add(TempItem);
}

Answer 1

您的問題是您沒有在組合框中添加值，但整個項目引用也是如此：

System.Windows.Controls.ComboBoxItem：Entry1

如果更改添加組合框值的方式，則可以看到它出現在列表框中：

private void AddNewEntry()
{
    UserEntryBox.Items.Add(NewEntryBox.Text);
}