我正在尝试将我的列表绑定到另一个列表中另一个对象中的列表。但是在第二个列表框中，项目才会出现。
XAML
<Window x:Class="Managing_program.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:Managing_program"
mc:Ignorable="d"
Title="Dashboard" Height="416.701" Width="867.828">
<Grid>
<TabControl Margin="0,26,0,0">
<TabItem Header="Tables">
<Grid Background="White" Margin="0,0,-2,0">
<Button Content="Add" Margin="10,0,0,10" Height="20" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="75" Command="{Binding AddTableCommand}"/>
<Button Content="Remove" Margin="90,0,0,10" HorizontalAlignment="Left" Width="75" Height="20" VerticalAlignment="Bottom" Command="{Binding RemoveTableCommand}"/>
<GroupBox Header="Fields" HorizontalAlignment="Left" Margin="204,0,0,35" Width="192" FontWeight="Bold">
<Grid ShowGridLines="False">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<ListBox Grid.Row="0" BorderThickness="2" ItemsSource="{Binding SelectedTable.Fields}" SelectedItem="{Binding SelectedField}" Margin="0 4" FontWeight="Normal">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<Label Content="test"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<TextBox Grid.Row="1" Margin="2" Text="{Binding FieldNameToAdd, Mode=TwoWay , UpdateSourceTrigger=PropertyChanged}"/>
</Grid>
</GroupBox>
<GroupBox Header="Tables" HorizontalAlignment="Left" Width="199" Margin="0,0,0,35" FontWeight="Bold">
<Grid ShowGridLines="False">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="30"/>
</Grid.RowDefinitions>
<TextBox x:Name="tbAddTable" Grid.Row="1" Margin="2" Text="{Binding Path=TableNameToAdd, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
<ListBox Grid.Row="0" ItemsSource="{Binding Tables}" SelectedItem="{Binding SelectedTable}" BorderThickness="2" Margin="0 4" FontWeight="Normal">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<Label Content="{Binding Name}"/>
<Label Content= "{Binding Fields.Count, StringFormat='Fields: {0}'}"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</GroupBox>
<Button Content="Add" Margin="207,0,0,10" Height="20" VerticalAlignment="Bottom" HorizontalAlignment="Left" Width="75" Command="{Binding AddFieldCommand}"/>
<Button Content="Remove" Margin="287,0,0,10" HorizontalAlignment="Left" Width="75" Height="20" VerticalAlignment="Bottom" Command="{Binding RemoveFieldCommand}"/>
<GroupBox Header="Field properties" Margin="401,0,10,35" FontWeight="Bold">
<Grid Margin="10,10,-2,5" ShowGridLines="True" DataContext="{Binding SelectedField}">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="28"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto"/>
<ColumnDefinition Width="200"/>
</Grid.ColumnDefinitions>
<Label Grid.Row="0" Grid.Column="0" Content="Name:"/>
<Label Grid.Row="1" Grid.Column="0" Content="Label:"/>
<Label Grid.Row="2" Grid.Column="0" Content="Type:"/>
<Label Grid.Row="3" Grid.Column="0" Content="Reference table:"/>
<Label Grid.Row="4" Grid.Column="0" Content="Visible:"/>
<Label Grid.Row="0" Grid.Column="1" Content="{Binding Name}" Margin="10,0,0,0"/>
<TextBox Grid.Row="1" Grid.Column="1" Text="{Binding Label}" Margin="5,2,0,2"/>
<ComboBox Grid.Column="1" Margin="5,5,0,5" Grid.Row="2" BorderBrush="White" RenderTransformOrigin="1.029,0.62">
</ComboBox>
<ComboBox Grid.Column="1" Margin="5,5,-0,121" Grid.Row="3" BorderBrush="White" RenderTransformOrigin="1.029,0.62">
</ComboBox>
</Grid>
</GroupBox>
</Grid>
</TabItem>
<TabItem Header="TabItem">
</TabItem>
</TabControl>
</Grid>
</Window>
MainViewModel：
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
namespace Managing_program.model
{
class MainWindowViewModel: ViewModelBase
{
public MainWindowViewModel()
{
// registering all commands
Tables = new ObservableCollection<Table>();
AddTableCommand = new DelegateCommand(ExecuteAddTableCommand, CanExecuteAddTableCommand);
RemoveTableCommand = new DelegateCommand(ExecuteRemoveTableCommand, CanExecuteRemoveTableCommand);
AddFieldCommand = new DelegateCommand(ExecuteAddFieldCommand, CanExecuteAddFieldCommand);
}
String _fieldNameToAdd = String.Empty;
public String FieldNameToAdd {
get { return _fieldNameToAdd; }
set {
_fieldNameToAdd = value;
OnPropertyChanged("FieldNameToAdd");
}
}
String _tableNameToAdd = string.Empty;
public String TableNameToAdd {
get {return _tableNameToAdd;}
set {
_tableNameToAdd = value;
OnPropertyChanged("TableNameToAdd");
}
}
#region allCommands:
// Add Table Command
public ICommand AddTableCommand { get; set; }
private void ExecuteAddTableCommand(object parameter)
{
Tables.Add(new Table(TableNameToAdd));
TableNameToAdd = String.Empty;
}
private bool CanExecuteAddTableCommand(object paramater)
{
if (TableNameToAdd.Length < 1)
return false;
if (TableNameToAdd.Contains(" "))
return false;
foreach (Table table in Tables)
{
if (table.Name.ToLower() == TableNameToAdd)
return false;
}
return true;
}
// Remove Table Command
public ICommand RemoveTableCommand { get; set; }
private void ExecuteRemoveTableCommand(object paramater){
Tables.Remove(SelectedTable);
}
private bool CanExecuteRemoveTableCommand(object parameter)
{
return SelectedTable != null;
}
// AddFieldCommand
public ICommand AddFieldCommand { get; set; }
private void ExecuteAddFieldCommand(object parameter)
{
SelectedTable.Fields.Add(new Field("test"));
}
private bool CanExecuteAddFieldCommand(object parameter)
{
if (SelectedTable == null)
return false;
if (FieldNameToAdd.Length < 1)
return false;
if (FieldNameToAdd.Contains(" "))
return false;
foreach (Field field in SelectedTable.Fields)
{
if (field.Name.ToLower() == FieldNameToAdd.ToLower())
return false;
}
return true;
}
#endregion
public ObservableCollection<Table> Tables { get; private set; }
public Table SelectedTable { get; set; }
public Field SelectedField { get; set; }
}
}
表类：
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Managing_program.model
{
class Table
{
public Table(String name)
{
Name = name;
Fields = new ObservableCollection<Field>();
}
public String Name { get; private set; }
public ObservableCollection<Field> Fields { get; private set; }
}
}
第二个列表框不会更新。请帮忙！
答案 0 :(得分：0)
好的，我发现了问题！我必须在SelectedTable属性中实现OnPropertyChanged（）。在那之后它立即开始工作！