我正在尝试创建一个编辑表单,用于编辑一组自定义电视剧对象的属性。其中一个属性包含将在 ComboBox
中显示的特定系列的所有拥有的媒体格式(DVD、Blu-ray 等)的集合。项目通过单独的弹出窗口添加到 ComboBox
,通过选择项目并点击删除 ComboBox
,项目将从 Button
中删除。
我可以向 MediaOwned ComboBox
添加新条目就好了,但是当我尝试选择特定的 ComboBox
项目来测试删除 Button
时,我发现我只能选择第一个条目。谁能告诉我我是否遗漏了一些非常明显的令人尴尬的事情,谢谢。
这是有问题的属性:
private ObservableCollection<string> _mediaOwned = new ObservableCollection<string>();
public ObservableCollection<string> MediaOwned
{
get { return _mediaOwned; }
set
{
_mediaOwned = value;
OnPropertyChanged(new PropertyChangedEventArgs("MediaOwned"));
}
}
以下是其他相关代码:
private void Window_Loaded(object sender, RoutedEventArgs e)
{
// Create binding for the ListBox.
Binding listBinding = new Binding();
listBinding.Source = show.Series;
listBinding.Mode = BindingMode.OneWay;
listBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
lbSeries.SetBinding(ListBox.ItemsSourceProperty, listBinding);
// Create binding for the ComboBox.
Binding myBinding = new Binding();
myBinding.Path = new PropertyPath("MediaOwned");
myBinding.Mode = BindingMode.TwoWay;
myBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
cbMediaOwned.SetBinding(ComboBox.ItemsSourceProperty, myBinding);
}
private void btnRemoveMedia_Click(object sender, RoutedEventArgs e)
{
Series series = (Series)lbSeries.SelectedItem;
series.MediaOwned.Remove(cbMediaOwned.Text);
}
这是 XAML 代码:
<Border Style="{StaticResource PanelBorderStyle}" DockPanel.Dock="Left" Margin="0,8,8,0"
DataContext="{Binding ElementName=lbLists, Path=SelectedItem}">
<DockPanel VerticalAlignment="Top">
<StackPanel>
<ListBox x:Name="lbSeries" Style="{StaticResource BasicListStyle}" Width="180" Height="300"
DisplayMemberPath="Title" SelectionMode="Single" LayoutUpdated="lbSeries_LayoutUpdated">
</ListBox>
</StackPanel>
<StackPanel x:Name="editPanel" DataContext="{Binding ElementName=lbSeries, Path=SelectedItem}">
<StackPanel Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0, 4, 0, 0">
<TextBlock Style="{StaticResource SmallFont}" Width="100">Title</TextBlock>
<TextBox x:Name="txtTitle" Style="{StaticResource TextBoxStyle}" Text="{Binding Path=Title, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Width="200" Margin="8, 8, 16, 8"></TextBox>
</StackPanel>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Top">
<TextBlock Style="{StaticResource SmallFont}" Width="100">Media owned</TextBlock>
<ComboBox x:Name="cbMediaOwned" Style="{StaticResource ComboBoxStyle}" Width="150" Margin="8,8,6,8"
></ComboBox>
<Button x:Name="btnAddMedia" Style="{StaticResource ToolbarButtonStyle}" Click="btnAddMedia_Click" Margin="0">
<StackPanel ToolTip="Add media">
<Image Source="Images/add.png" />
</StackPanel>
</Button>
<Button x:Name="btnRemoveMedia" Style="{StaticResource ToolbarButtonStyle}" Click="btnRemoveMedia_Click" Margin="4">
<StackPanel ToolTip="Remove media">
<Image Source="Images/remove.png" />
</StackPanel>
</Button>
</StackPanel>
</StackPanel>
</DockPanel>
</Border>
或者,我也可以删除后面代码中的绑定代码,并将 ComboBox
替换为以下代码(但我仍然遇到同样的问题 - 我无法在 ComboBox
中选择任何内容) :
<ComboBox x:Name="cbMediaOwned" Style="{StaticResource ComboBoxStyle}" Width="150" Margin="8,8,6,8" ItemsSource="{Binding ElementName=lbSeries, Path=SelectedItem.MediaOwned, UpdateSourceTrigger=PropertyChanged}"
SelectedItem="{Binding SelectedMedia, UpdateSourceTrigger=PropertyChanged}"></ComboBox>
SelectedMedia 属性:
private string _selectedMedia = "";
public string SelectedMedia
{
get { return _selectedMedia; }
set
{
_selectedMedia = value;
OnPropertyChanged(new PropertyChangedEventArgs("SelectedMedia"));
}
}
答案 0 :(得分:0)
这是我的 xaml:
<ComboBox x:Name="Models_ComboBox"
Width="110"
Text="Model"
ItemsSource="{Binding Models}"
SelectedItem="{Binding SelectedModel}"
DisplayMemberPath="Model"
MouseDoubleClick="Models_ComboBox_MouseDoubleClick"
SelectionChanged="Models_ComboBox_SelectionChanged"/>
这是我的 VM 属性:
private DataTable models;
public DataTable Models
{
get { return models; }
set
{
if (models != value)
{
models = value;
OnPropertyChanged(nameof(Models));
}
}
}
和
private DataRowView selectedModel;
public DataRowView SelectedModel
{
get { return selectedModel; }
set
{
if (selectedModel != value)
{
selectedModel = value;
if (value != null)
{
InitializeOptions(value["Model"].ToString());
}
OnPropertyChanged(nameof(SelectedModel));
}
}
}
如您所见,ComboBox 的 ItemsSource 和 SelectedItem 绑定到 ViewModel 中的两个不同属性。 ItemsSource 绑定到从数据库填充的 DataTable。一旦用户选择了一个模型,就会有其他选项组合框根据该选择进行填充。
答案 1 :(得分:0)
自己解决了这个问题。我有一行代码会在我没有意识到的情况下自动设置 SelectedIndex
的 ComboBox
。