[英]ComboBox SelectedValue or SelectedItem Binding WPF C#
[英]C# WPF binding - Combobox selecteditem to Listbox?
我正在嘗試將具有兩個類別(字母和數字)的 ComboBox 綁定到列表框。
這是 C# 代碼:
class LibraryViewModel
{
public LetterOrNumberList lib { get; }
public LibraryViewModel()
{
lib = new LetterOrNumberList();
}
}
public class LetterOrNumberList : ObservableCollection<LettersAndNumbers>
{
public LetterOrNumberList()
{
LettersAndNumbers Letters = new LettersAndNumbers();
Letters.Title = "Letters";
ObservableCollection<IExample> letters = new ObservableCollection<IExample>();
letters.Add(new LetterA());
letters.Add(new LetterB());
Letters.LetterOrNumber = letters;
LettersAndNumbers Numbers = new LettersAndNumbers();
Numbers.Title = "Numbers";
ObservableCollection<IExample> numbers = new ObservableCollection<IExample>();
numbers.Add(new Number1());
numbers.Add(new Number2());
Numbers.LetterOrNumber = numbers;
this.Add(Letters);
this.Add(Numbers);
}
}
public class LettersAndNumbers
{
public string Title { get; set; }
public ObservableCollection<IExample> LetterOrNumber { get; set; }
}
public class LetterA : PropertyChangeClass, IExample
{
public string value
{
get
{
return _value;
}
set
{
_value = value;
OnPropertyChanged(nameof(value));
}
}
public LetterA()
{
value = "A";
}
private string _value;
}
public class LetterB : PropertyChangeClass, IExample
{
//principial the same like class Letter A
//...
}
public class Number1 : PropertyChangeClass, IExample
{
//principial the same like class Letter A
//...
}
public class Number2 : PropertyChangeClass, IExample
{
//principial the same like class Letter A
//...
}
public class PropertyChangeClass
{
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string PropertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(PropertyName));
}
}
public interface IExample
{
string value { get; set; }
}
在 XAML 中,我嘗試如下:
<ComboBox Width="100" Name="cBox" Text="Bitte auswählen" ItemsSource="{Binding lib}" DisplayMemberPath="Title"/>
<ListBox Grid.Row="2" ItemsSource="{Binding cBox}" DisplayMemberPath="value"/>
ComboBox 綁定有效,但我不知道如何根據 selecteditem 綁定嵌套的“value”屬性。
也許有人知道如何解決。 謝謝!
編輯:
我有一個不同產品的庫。 每個產品都分配給一個類別。 最后,用戶應該選擇一個類別,它的產品將被動態顯示(在列表框中)。 我已經在一個 observablecollection 中對它進行了排序,我的結構與上面的代碼相同。
我終於明白了:
<ListBox Grid.Row="2" ItemsSource="{Binding ElementName=cBox, Path=SelectedItem.LetterOrNumber, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<TextBlock Text="{Binding Path=value}"/>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
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