次の例で、テキストボックスに BillingModel.BillingModelDescription プロパティが表示されているのに、「Billing Model」コンボボックスにプロパティが表示されない理由がわかりません。クライアントを選択した後、コンボボックスに現在の請求モデルの説明を表示したいのですが、空白のままです。同じものにバインドされたテキストボックスには、説明が表示されます。ItemsSource として可能なモデルのコレクションがあり、正常に動作しています。クライアントの選択時に請求モデル コンボボックスを更新するにはどうすればよいですか?
XAML は次のとおりです。
<Window x:Class="WpfApplication7.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<StackPanel>
<StackPanel Orientation="Horizontal">
<Label Content="Client"/>
<ComboBox ItemsSource="{Binding AllClientData}" DisplayMemberPath="EmployerStr"
SelectedItem="{Binding SelectedClient}"
Width="300"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Label Content="Billing Model:"/>
<ComboBox ItemsSource="{Binding AllBillingModels}" DisplayMemberPath="BillingModelDescription"
SelectedItem="{Binding SelectedClient.BillingModel}"
Width="300"/>
</StackPanel>
<StackPanel Orientation="Horizontal">
<Label Content="Billing Model" />
<TextBox Text="{Binding SelectedClient.BillingModel.BillingModelDescription}" Width="200"/>
</StackPanel>
</StackPanel>
コード ビハインド (これは単なる例です。完全なアプリで MVVM などを使用していますが、これは問題を説明する目的に役立ちます):
public partial class MainWindow : Window, INotifyPropertyChanged
{
public MainWindow()
{
AllClientData = new ObservableCollection<ClientRate>();
AllBillingModels = new ObservableCollection<BillingModelType>();
ClientRate uno = new ClientRate();
uno.BillingModel = new BillingModelType();
uno.BillingModel.BillingModelID = 3;
uno.BillingModel.BillingModelDescription = "Free";
uno.ID = 01;
uno.EmployerName = "Employer1";
ClientRate dos = new ClientRate();
dos.BillingModel = new BillingModelType();
dos.BillingModel.BillingModelID = 2;
dos.BillingModel.BillingModelDescription = "Variable";
dos.ID = 02;
dos.EmployerName = "Employer2";
ClientRate tre = new ClientRate();
tre.BillingModel = new BillingModelType();
tre.BillingModel.BillingModelID = 1;
tre.BillingModel.BillingModelDescription = "Flat";
tre.ID = 01;
tre.EmployerName = "Employer3";
AllClientData.Add(uno);
AllClientData.Add(dos);
AllClientData.Add(tre);
BillingModelType one = new BillingModelType();
one.BillingModelID = 1;
one.BillingModelDescription = "Flat";
BillingModelType two = new BillingModelType();
two.BillingModelID = 2;
two.BillingModelDescription = "Variable";
BillingModelType three = new BillingModelType();
three.BillingModelID = 3;
three.BillingModelDescription = "Free";
AllBillingModels.Add(one);
AllBillingModels.Add(two);
AllBillingModels.Add(three);
InitializeComponent();
this.DataContext = this;
}
private ObservableCollection<ClientRate> _allClientData;
public ObservableCollection<ClientRate> AllClientData
{
get { return _allClientData; }
set
{
if (_allClientData != value)
{
_allClientData = value;
FirePropertyChanged("AllClientData");
}
}
}
private ClientRate _selectedClient;
/// <summary>
/// Gets/Sets Global SelectedClient object
/// </summary>
public ClientRate SelectedClient
{
get { return _selectedClient; }
set
{
if (_selectedClient != value)
{
_selectedClient = value;
FirePropertyChanged("SelectedClient");
}
}
}
//private BillingModelType _selectedBillingModel;
//public BillingModelType SelectedBillingModel
//{
// get
// {
// return _selectedBillingModel;
// }
// set
// {
// if (_selectedBillingModel != value)
// {
// _selectedBillingModel = value;
// FirePropertyChanged("SelectedBillingModel");
// }
// }
//}
private ObservableCollection<BillingModelType> _allBillingModels;
/// <summary>
/// Holds all possible billing model types
/// </summary>
public ObservableCollection<BillingModelType> AllBillingModels
{
get { return _allBillingModels; }
set
{
if (_allBillingModels != value)
{
_allBillingModels = value;
FirePropertyChanged("AllBillingModels");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void FirePropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public class BillingModelType
{
/// <summary>
/// Billing Model ID
/// </summary>
public int? BillingModelID { get; set; }
/// <summary>
/// Billing Model Description
/// </summary>
public string BillingModelDescription { get; set; }
}
public class ClientRate : INotifyPropertyChanged
{
/// <summary>
/// Employer name with Employer ID in parentheses
/// </summary>
public string EmployerStr { get { return EmployerName + " (" + ID + ")"; } }
/// <summary>
/// Employer ID
/// </summary>
public int? ID { get; set; }
private string _EmployerName;
/// <summary>
/// Employer Official Name
/// </summary>
public string EmployerName
{
get { return _EmployerName; }
set
{
if (_EmployerName != value)
{
_EmployerName = value;
FirePropertyChanged("EmployerName");
}
}
}
private BillingModelType _billingModel;
/// <summary>
/// Rate Type ID and Description
/// </summary>
public BillingModelType BillingModel
{
get { return _billingModel; }
set
{
if (_billingModel != value)
{
_billingModel = value;
FirePropertyChanged("BillingModel");
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected void FirePropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}