WPF：在DataTemplate中綁定依賴屬性。 PropertyChangedCallback未解僱

Question

今天我真的很難受。由於缺乏WPF經驗，我無法想象。我從類開發GUI生成的小框架（WinForms \ WPF \ HTML）。爲此，我需要動態創建元素。

我有的DependencyProperty

定製用戶控件

public partial class ObjectPicker : UserControl 
    { 
     private ViewModel _vm; 
     public ObjectPicker() 
     { 
      InitializeComponent(); 
     } 

     public object ObjectValue 
     { 
      get { return GetValue(ObjectValueProperty); } 
      set { SetValue(ObjectValueProperty, value); } 
     } 

     public static DependencyProperty ObjectValueProperty = 
      DependencyProperty.Register(
       "ObjectValue", 
       typeof(object), 
       typeof(ObjectPicker), 
       new FrameworkPropertyMetadata(
        new PropertyMetadata(new object(), OnObjectChangeNotify, CoerceValueCallback), FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)); 

     private static void OnObjectChangeNotify(DependencyObject d, DependencyPropertyChangedEventArgs e) 
     { 
      var sender = d as ObjectPicker; 
      sender.OnObjectValueChange(d, e); 
     } 

     public void OnObjectValueChange(DependencyObject d, DependencyPropertyChangedEventArgs e) 
     { 
      this.ObjectValue = e.NewValue; 
     } 
    } 

我有CustomBoundColumn其中I重寫GenerateElement方法（其中BindingObject - 包裝用2個屬性值和PROPNAME）。然後我像這樣綁定對象，然後它不起作用。

 var content = new ContentControl(); 
     content.ContentTemplate = (DataTemplate)cell.FindResource(TemplateName); 
     var propName = ((Binding)Binding).Path.Path; 
     BindingObject bo = new BindingObject(propName, dataItem); 
     content.SetValue(ContentControl.ContentProperty, bo); 
     return content; 

數據模板（例如我把其中兩個工作完美的另一模板）：

<DataTemplate x:Key="TextBoxDataTemplate"> 
     <TextBox Text="{Binding Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /> 
    </DataTemplate> 
    <DataTemplate x:Key="DatePickerDataTemplate"> 
     <DatePicker SelectedDate="{Binding Value,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /> 
    </DataTemplate> 
    <DataTemplate x:Key="ObjectPickerDataTemplate"> 
     <local:ObjectPicker ObjectValue="{Binding Value, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/> 
    </DataTemplate> 

當我綁定程序是這樣的：

objectPicker.SetBinding(ObjectPicker.ObjectValueProperty, binding); 

當它工作。

我不知道有什麼額外的信息需要解決這個問題。如果您需要更多，請留下評論並添加它。

UPDATE1：添加BindingObject類

public class BindingObject : INotifyPropertyChanged 
{ 
    private object _value; 
    private PropertyDescriptor _pd; 
    private MethodInfo _method; 

    public BindingObject(string propName, object value) 
    { 
     _method = value.GetType().GetMethods().FirstOrDefault(x => x.Name == "OnPropertyChanged"); 
     if (!(value is INotifyPropertyChanged) || _method == null) throw new Exception("Invalid value"); 
     _value = value; 
     _pd = TypeDescriptor.GetProperties(_value.GetType())[propName]; 

     (_value as INotifyPropertyChanged).PropertyChanged += (o, e) => 
     { 
      OnPropertyChanged(nameof(Value)); 
      OnPropertyChanged(_pd.Name); 
     }; 
    } 

    public string PropName 
    { 
     get { return _pd.Name; } 
    } 

    public object Value 
    { 
     get 
     { 
      return _pd.GetValue(_value); 
     } 
     set 
     { 
      _pd.SetValue(_value, value); 

     } 
    } 

    private void RaisePropertyChanged() 
    { 
     _method.Invoke(_value, new[] { nameof(Value) }); 
     _method.Invoke(_value, new[] { _pd.Name }); 
    } 

    public event PropertyChangedEventHandler PropertyChanged; 

    [NotifyPropertyChangedInvocator] 
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) 
    { 
     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); 
    } 
} 

UPDATE2：DataItem的

public class DataItem 
{ 
     public virtual string Value1 { get; set; } // This type of property work fine and binding 
     public virtual int Value2 { get; set; } // This type of property work fine and binding 
     public virtual DateTime Value3 { get; set; } // This type of property work fine and binding 
     public virtual ExampleComplexObject Object { get; set; } // This type not working 

} 

public class ExampleComplexObject 
{ 
     public virtual int Value1 { get; set; } 
     public virtual string Value2 { get; set; } 
} 

在運行時則需要創建對象類型傳遞到工廠，從傳遞類型與INotifyPropertyChanged的創建代理對象的實現示例實現。

Answer 1

我不知道如果我理解您的具體問題，在這裏，但你可以嘗試到ContentControl中的內容屬性設置爲數據對象：

var content = new ContentControl(); 
content.ContentTemplate = (DataTemplate)cell.FindResource(TemplateName); 
content.SetValue(ContentControl.ContentProperty, dataItem); 
return content; 

那麼你應該能夠綁定到Value屬性在DataTemplate中使用{Binding Value}。