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我遇到了一個問題，試圖綁定一個對象的屬性，這已經是另一個對象的屬性。當我綁定上層對象的屬性時，一切正常，但是當我試圖綁定一個屬性的屬性時，它不顯示任何內容。如何綁定已經是已綁定對象屬性的對象的屬性？
這裏是我的代碼：XAML
<Window x:Class="WpfTutorialSamples.ListView_control.ListViewColumnSortingSample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="ListViewColumnSortingSample" Height="200" Width="550">
<Grid Margin="10">
<ListView Name="lvUsers">
<ListView.Resources>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
</Style>
</ListView.Resources>
<ListView.View>
<GridView>
<GridViewColumn Width="120" DisplayMemberBinding="{Binding Transponder}">
<GridViewColumn.Header>
<GridViewColumnHeader Tag="Transponder" Click="lvUsersColumnHeader_Click">Transponder</GridViewColumnHeader>
</GridViewColumn.Header>
</GridViewColumn>
<GridViewColumn Width="80" DisplayMemberBinding="{Binding Tipo}">
<GridViewColumn.Header>
<GridViewColumnHeader Tag="Tipo" Click="lvUsersColumnHeader_Click">Tipo</GridViewColumnHeader>
</GridViewColumn.Header>
</GridViewColumn>
<GridViewColumn Width="110" DisplayMemberBinding="{Binding Destruida}">
<GridViewColumn.Header>
<GridViewColumnHeader Tag="Destruida" Click="lvUsersColumnHeader_Click">Destruida</GridViewColumnHeader>
</GridViewColumn.Header>
</GridViewColumn>
<GridViewColumn Width="80" >
<GridViewColumn.Header>
<GridViewColumnHeader Tag="Combustible">Combustible</GridViewColumnHeader>
</GridViewColumn.Header>
<GridViewColumn.CellTemplate>
<DataTemplate>
<ComboBox SelectionChanged="ComboBox_StopChanges" DataContext="{Binding Combustible}">
<ComboBox.Resources>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}">White</SolidColorBrush>
</ComboBox.Resources>
<ComboBox.Items>
<StackPanel Orientation="Horizontal">
<StackPanel>
<StackPanel Name="stckContentLeft">
<Label BorderBrush="White" BorderThickness="1" Content="Loaded :" FontSize="12" FontWeight="SemiBold" Foreground="Black" Height="25" HorizontalAlignment="Left" Margin="2,2,0,0" VerticalAlignment="Top" Width="95"/>
<Label BorderBrush="White" BorderThickness="1" Content="Used :" FontSize="12" FontWeight="SemiBold" Foreground="Black" Height="25" HorizontalAlignment="Left" Margin="2,2,0,0" VerticalAlignment="Top" Width="95"/>
</StackPanel>
</StackPanel>
<StackPanel>
<StackPanel Name="stckContentRigth">
<TextBox Name="textBoxLoaded" Height="25" Width="115" MaxLength="3" Margin="2,2,0,0" BorderBrush="Black" BorderThickness="1" FontSize="12" FontWeight="SemiBold" HorizontalAlignment="Left" Text="{Binding Cargado}" VerticalAlignment="Top" />
<TextBox Name="textBoxUsed" Height="25" Width="115" MaxLength="3" Margin="2,2,0,0" BorderBrush="Black" BorderThickness="1" FontSize="12" FontWeight="SemiBold" HorizontalAlignment="Left" Text="{Binding Usado}" VerticalAlignment="Top" />
</StackPanel>
</StackPanel>
</StackPanel>
</ComboBox.Items>
</ComboBox>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
和C＃代碼：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
namespace WpfTutorialSamples.ListView_control
{
public partial class ListViewColumnSortingSample : Window
{
private GridViewColumnHeader listViewSortCol = null;
private SortAdorner listViewSortAdorner = null;
public ListViewColumnSortingSample()
{
InitializeComponent();
List<User> items = new List<User>();
items.Add(new User() { Transponder = "M001", Tipo = "UH60", Destruida = Estado_Aeronave.Destruida, combustible = new Combustible() {Cargado = 4000, Usado = 3000} });
items.Add(new User() { Transponder = "M002", Tipo = "UH70", Destruida = Estado_Aeronave.Funcional, combustible = new Combustible() { Cargado = 3000, Usado = 2000 } });
items.Add(new User() { Transponder = "M003", Tipo = "UH80", Destruida = Estado_Aeronave.Funcional, combustible = new Combustible() { Cargado = 2000, Usado = 1000 } });
items.Add(new User() { Transponder = "M004", Tipo = "UH90", Destruida = Estado_Aeronave.Destruida, combustible = new Combustible() { Cargado = 1000, Usado = 500 } });
lvUsers.ItemsSource = items;
}
private void lvUsersColumnHeader_Click(object sender, RoutedEventArgs e)
{
GridViewColumnHeader column = (sender as GridViewColumnHeader);
string sortBy = column.Tag.ToString();
if (listViewSortCol != null)
{
AdornerLayer.GetAdornerLayer(listViewSortCol).Remove(listViewSortAdorner);
lvUsers.Items.SortDescriptions.Clear();
}
ListSortDirection newDir = ListSortDirection.Ascending;
if (listViewSortCol == column && listViewSortAdorner.Direction == newDir)
newDir = ListSortDirection.Descending;
listViewSortCol = column;
listViewSortAdorner = new SortAdorner(listViewSortCol, newDir);
AdornerLayer.GetAdornerLayer(listViewSortCol).Add(listViewSortAdorner);
lvUsers.Items.SortDescriptions.Add(new SortDescription(sortBy, newDir));
}
private void ComboBox_StopChanges(object sender, SelectionChangedEventArgs e)
{
ComboBox snd = sender as ComboBox;
snd.SelectedIndex = -1;
}
}
public enum Estado_Aeronave { Destruida, Funcional };
public class Combustible
{
public int Cargado { get; set; }
public int Usado { get; set; }
}
public class User
{
public string Transponder { get; set; }
public string Tipo { get; set; }
public Estado_Aeronave Destruida { get; set; }
public Combustible combustible { get; set; }
}
public class SortAdorner : Adorner
{
private static Geometry ascGeometry =
Geometry.Parse("M 0 4 L 3.5 0 L 7 4 Z");
private static Geometry descGeometry =
Geometry.Parse("M 0 0 L 3.5 4 L 7 0 Z");
public ListSortDirection Direction { get; private set; }
public SortAdorner(UIElement element, ListSortDirection dir)
: base(element)
{
this.Direction = dir;
}
protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
if (AdornedElement.RenderSize.Width < 20)
return;
TranslateTransform transform = new TranslateTransform
(
AdornedElement.RenderSize.Width - 15,
(AdornedElement.RenderSize.Height - 5)/2
);
drawingContext.PushTransform(transform);
Geometry geometry = ascGeometry;
if (this.Direction == ListSortDirection.Descending)
geometry = descGeometry;
drawingContext.DrawGeometry(Brushes.Black, null, geometry);
drawingContext.Pop();
}
}
}
如果你能幫助我將永遠感謝您。
祝您有愉快的一天。
請具體談談哪一個元素（一個或多個）都無法正確顯示，以及你期望他們展示什麼。此外，雖然上面的代碼示例相當短，但如果您提供[良好，_minimal_，_complete_代碼示例]（https://stackoverflow.com/help/mcve）可以可靠地再現問題，則會更好。換句話說，你應該從上面的代碼示例中刪除所有不再需要重現問題的東西。 –
對不起，我試圖顯示Combobox中的元素。感謝您的建議，下次我會盡量縮短它。 –