我有一個由一個字串和一個陣列字串組成的物件。我將字串系結到一個組合框，但我還想做的是將該物件的陣列系結到一個串列視圖，并讓它根據組合框的值動態變化。未填充陣列中的值，僅填充陣列的 dataType。我不喜歡使用串列視圖，但我認為這將是最簡單的。
模型 -
namespace DataBinding_WPF.Model
{
public class ExampleModel { }
public class Example : INotifyPropertyChanged
{
private string _name;
private string[] _ids;
public string Name
{
get => _name;
set
{
if (_name != value)
{
_name = value;
RaisePropertyChanged("Name");
}
}
}
public string[] IDs
{
get => _ids;
set
{
if (_ids != value)
{
_ids = value;
RaisePropertyChanged("IDs");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string property)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new
PropertyChangedEventArgs(property));
}
}
}
視圖模型 -
namespace DataBinding_WPF.ViewModel
{
public class ExampleViewModel
{
public ObservableCollection<Example> Examples
{
get;
set;
}
public void LoadExample()
{
ObservableCollection<Example> examples = new ObservableCollection<Example>();
examples.Add(new Example { Name = "Mark", IDs = new string[] { "123", "456" }});
examples.Add(new Example { Name = "Sally", IDs = new string[] { "789","101112" }});
Examples = examples;
}
}
}
XAML -
<Grid>
<StackPanel HorizontalAlignment = "Left" >
<ComboBox HorizontalAlignment="Left"
VerticalAlignment="Top"
Width="120"
ItemsSource="{Binding Path=Examples}"
SelectedItem="{Binding Path=Name, Mode=TwoWay}"
DisplayMemberPath="Name"/>
<ListView x:Name="myListView"
ItemsSource="{Binding Path=Examples}"
SelectedValue="{Binding Path=IDs}"
Height="200" Margin="0,50,0,0"
Width="Auto"
VerticalAlignment="Top"
Background="AliceBlue">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<CheckBox
Name="myCheckBox"
IsChecked="{Binding IsSelected,
RelativeSource={RelativeSource AncestorType=ListViewItem}}"
Margin="5, 0"/>
<TextBlock Text= "{Binding Path=IDs}" FontWeight="Bold" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackPanel>
</Grid>
uj5u.com熱心網友回復：
如果要在 ListBox 中顯示組合框中所選專案的 Id。您需要將SelectedItem屬性添加到您的 VM 中，該屬性還必須實作INotifyPropertyChanged介面。
namespace DataBinding_WPF.ViewModel
{
public class ExampleViewModel : INotifyPropertyChanged
{
public ObservableCollection<Example> Examples
{
get;
set;
}
// SelectedItem in the ComboBox
// SelectedItem.Ids will be ItemsSource for the ListBox
private Example _selectedItem;
public Example SelectedItem
{
get => _selectedItem;
set {
_selectedItem = value;
OnPropertyChanged(nameof(SelectedItem));
}
}
// SelectedId in ListView
private string _selectedId;
public string SelectedId
{
get => _selectedId;
set {
_selectedId= value;
OnPropertyChanged(nameof(SelectedId));
}
}
public void LoadExample()
{
ObservableCollection<Example> examples = new ObservableCollection<Example>();
examples.Add(new Example { Name = "Mark", IDs = new string[] { "123", "456" }});
examples.Add(new Example { Name = "Sally", IDs = new string[] { "789","101112" }});
Examples = examples;
}
}
}
XAML
<Grid>
<StackPanel HorizontalAlignment = "Left" >
<ComboBox HorizontalAlignment="Left"
VerticalAlignment="Top"
Width="120"
ItemsSource="{Binding Path=Examples}"
SelectedItem="{Binding SelectedItem}"
DisplayMemberPath="Name"/>
<ListView x:Name="myListView"
ItemsSource="{Binding SelectedItem.Ids}"
SelectedItem="{Binding SelectedId}"
Height="200" Margin="0,50,0,0"
Width="Auto"
VerticalAlignment="Top"
Background="AliceBlue">
<ListView.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<CheckBox
Name="myCheckBox"
IsChecked="{Binding IsSelected,
RelativeSource={RelativeSource AncestorType=ListViewItem}}"
Margin="5, 0"/>
<TextBlock Text= "{Binding}" FontWeight="Bold" />
</StackPanel>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackPanel>
</Grid>
uj5u.com熱心網友回復：
您的情況可能有幾種解決方案，但最常見和專有的方法是使用ValueConverter。
對于此示例，我假設您在Window控制元件中有網格。您需要添加靜態資源：
<Window.Resources>
<local:ArrayValueConverter x:Key="arrayConverter"/>
</Window.Resources>
然后在您的 ListView 的 DataTemplate 中添加Converter：
<TextBlock Text= "{Binding Path=IDs, Converter={StaticResource arrayConverter}}" FontWeight="Bold" />
ValueConverter 本人：
public class ArrayValueConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value is string[] arr) {
return string.Join(',', arr);
}
return value;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return value;
}
}
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