ItemsControl 在另一个 ItemsControl 中绑定

Question

我需要在另一个 ObservableCollection 中绑定一个 ObservableCollection。 xaml 如下。外部 ItemControl 工作正常并且 'RangeLeft' 属性显示正常。问题出在内部 ItemControl。根据内部列表中的项目创建环绕面板（在内部 ItemControl 中）的计数，但从不显示属性 'ContionalString'。

 <ItemsControl ItemsSource="{Binding mMngModelList}">
  <ItemsControl.ItemTemplate>
   <DataTemplate>
    <Expander>
    <StackPanel >
        <WrapPanel>
            <TextBlock Text="{Binding RangeLeft}"/>
        </WrapPanel>
        <ItemsControl ItemsSource="{Binding ConditionList}">
            <ItemsControl.ItemTemplate>
                <DataTemplate>
                    <WrapPanel>
                        <TextBlock Text="{Binding ConditionString}"/>
                        <TextBlock Text="     "/>
                        <Button Content="+" />
                    </WrapPanel>
                </DataTemplate>
            </ItemsControl.ItemTemplate>
        </ItemsControl>
    </StackPanel>
   </Expander>
  </DataTemplate>
 </ItemsControl.ItemTemplate>
</ItemsControl>

后面的代码是

public class ManagementFunctionModel : INotifyPropertyChanged, IDataErrorInfo
{
    #region members
    string _Type;
    int _RangeLeft;
    int _RangeTop;
    int _RangeRight;
    int _RangeBottom;
    public ObservableCollection<Condition> _ConditionList { get; private set;      }
#endregion

public ManagementFunctionModel()
{
    _ConditionList = new ObservableCollection<Condition>();
    _ConditionList.Add(new Condition() { ConditionString = "condition 1" });
    _ConditionList.Add(new Condition() { ConditionString = "condition 2" });
    _ConditionList.Add(new Condition() { ConditionString = "condition 3" });
}


public ObservableCollection<Condition> ConditionList
{
    get { return _ConditionList; }
    set
    {
        if (_ConditionList != value)
        {
            _ConditionList = value;
            RaisePropertyChanged("ConditionList");
        }
    }
}

public int RangeLeft
{
    get { return _RangeLeft; }
    set
    {
        if (_RangeLeft != value)
        {
            _RangeLeft = value;
            RaisePropertyChanged("RangeLeft");
        }
    }
}

条件Class

public class Condition
{
    public string ConditionString;
}

在我看来

    mMngModelList = new ObservableCollection<ManagementFunctionModel>();

    mMngModelListShow.Add(new ManagementFunctionModel() { RangeLeft = 9, RangeTop = 3 });
    mMngModelListShow.Add(new ManagementFunctionModel() { RangeLeft = 10, RangeTop = 1 });
    mMngModelListShow.Add(new ManagementFunctionModel() { RangeLeft = 11, RangeTop = 2 });

Answer 1

我试过你的代码，如果你在 Condition class 中将 ConditionString 声明为属性而不是 classic 字段，它工作正常。这是我的测试代码：

    public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        var mMngModelList = new ObservableCollection<ManagementFunctionModel>();

        mMngModelList.Add(new ManagementFunctionModel() { RangeLeft = 9 });
        mMngModelList.Add(new ManagementFunctionModel() { RangeLeft = 10 });
        mMngModelList.Add(new ManagementFunctionModel() { RangeLeft = 11 });

        this.DataContext = mMngModelList;
    }
}

public class Condition
{
    public string ConditionString { get; set; }
}

public class ManagementFunctionModel : INotifyPropertyChanged, IDataErrorInfo
{
    #region members
    string _Type;
    int _RangeLeft;
    int _RangeTop;
    int _RangeRight;
    int _RangeBottom;
    public ObservableCollection<Condition> _ConditionList { get; private set; }
    #endregion

    public ManagementFunctionModel()
    {
        _ConditionList = new ObservableCollection<Condition>();
        _ConditionList.Add(new Condition() { ConditionString = "condition 1" });
        _ConditionList.Add(new Condition() { ConditionString = "condition 2" });
        _ConditionList.Add(new Condition() { ConditionString = "condition 3" });
    }


    public ObservableCollection<Condition> ConditionList
    {
        get { return _ConditionList; }
        set
        {
            if (_ConditionList != value)
            {
                _ConditionList = value;
                RaisePropertyChanged("ConditionList");
            }
        }
    }

    public int RangeLeft
    {
        get { return _RangeLeft; }
        set
        {
            if (_RangeLeft != value)
            {
                _RangeLeft = value;
                RaisePropertyChanged("RangeLeft");
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void RaisePropertyChanged(String property)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(property));
    }

    public string Error
    {
        get { throw new NotImplementedException(); }
    }

    public string this[string columnName]
    {
        get { throw new NotImplementedException(); }
    }
}

这是 UI 代码：

<Window x:Class="WpfApplication1.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">
<Grid>
    <ItemsControl ItemsSource="{Binding}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Expander>
                    <StackPanel >
                        <WrapPanel>
                            <TextBlock Text="{Binding RangeLeft}"/>
                        </WrapPanel>
                        <ItemsControl ItemsSource="{Binding ConditionList}">
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <WrapPanel>
                                        <TextBlock Text="{Binding ConditionString}"/>
                                        <TextBlock Text="        "/>
                                        <Button Content="+" />
                                    </WrapPanel>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </StackPanel>
                </Expander>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</Grid>

ItemsControl 在另一个 ItemsControl 中绑定

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