C# 可绑定属性在用户控件wpf中不起作用

我有用户控件，并在该用户控件内创建DependencProperty ItemSource，如下所示

public static readonly DependencyProperty ItemsSourceProperty = 
    DependencyProperty.Register(
        "ItemsSource", typeof(IEnumerable), typeof(DataGridFilterDetail),
        new PropertyMetadata(new PropertyChangedCallback(OnItemsSourcePropertyChanged)));

public IEnumerable ItemsSource
{
   get
   {
      return (IEnumerable)GetValue(ItemsSourceProperty);
   }
   set
   {
      SetValue(ItemsSourceProperty, value);
      NotifyPropertyChanged("ItemsSource");
   }
}

static void OnItemsSourcePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
   var control = sender as DataGridFilterDetail;
   if (control != null)
   {
      control.OnItemsSourceChanged((IEnumerable)e.OldValue(IEnumerable)e.NewValue);
   }
}

void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
{
    // Remove handler for oldValue.CollectionChanged
    var oldValueINotifyCollectionChanged = oldValue as INotifyCollectionChanged;

    if (null != oldValueINotifyCollectionChanged)
    {
        oldValueINotifyCollectionChanged.CollectionChanged -= new NotifyCollectionChangedEventHandler(newValueINotifyCollectionChanged_CollectionChanged);
    }
        // Add handler for newValue.CollectionChanged (if possible)
    var newValueINotifyCollectionChanged = newValue as INotifyCollectionChanged;
    if (null != newValueINotifyCollectionChanged)
    {
        newValueINotifyCollectionChanged.CollectionChanged += new NotifyCollectionChangedEventHandler(newValueINotifyCollectionChanged_CollectionChanged);
    }
 }

void newValueINotifyCollectionChanged_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
     if (e.NewItems == null)
     {
         TotalCount = 0;
     }
     else
     {
         TotalCount = e.NewItems.Count;
     }
 }

 private ObservableCollection<myCustomClass> gridItemCollections;
 public ObservableCollection<myCustomClass> GridItemCollections
 {
     get { return gridItemCollections; }
     set
     {
         gridItemCollections = value;
         NotifyPropertyChanged("GridItemCollections");
     }
 }

 public void AddNewGridRow()
 {
    GridItemCollections.Add(CurrentDetail);
 }

然后我将ItemSource绑定到UserControl内的DataGrid的ItemSource中，如下所示

<UserControl x:Class="WPF.Controls.DataGridFilterDetail" x:Name="dataGridFilterDetail" .../>
    <DataGrid ItemsSource="{Binding ElementName=dataGridFilterDetail,Path=ItemsSource}" AutoGenerateColumns="True"/>
</UserControl>

在myViewModel上，我创建了如下属性GridItemCollections

public static readonly DependencyProperty ItemsSourceProperty = 
    DependencyProperty.Register(
        "ItemsSource", typeof(IEnumerable), typeof(DataGridFilterDetail),
        new PropertyMetadata(new PropertyChangedCallback(OnItemsSourcePropertyChanged)));

public IEnumerable ItemsSource
{
   get
   {
      return (IEnumerable)GetValue(ItemsSourceProperty);
   }
   set
   {
      SetValue(ItemsSourceProperty, value);
      NotifyPropertyChanged("ItemsSource");
   }
}

static void OnItemsSourcePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
   var control = sender as DataGridFilterDetail;
   if (control != null)
   {
      control.OnItemsSourceChanged((IEnumerable)e.OldValue(IEnumerable)e.NewValue);
   }
}

void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
{
    // Remove handler for oldValue.CollectionChanged
    var oldValueINotifyCollectionChanged = oldValue as INotifyCollectionChanged;

    if (null != oldValueINotifyCollectionChanged)
    {
        oldValueINotifyCollectionChanged.CollectionChanged -= new NotifyCollectionChangedEventHandler(newValueINotifyCollectionChanged_CollectionChanged);
    }
        // Add handler for newValue.CollectionChanged (if possible)
    var newValueINotifyCollectionChanged = newValue as INotifyCollectionChanged;
    if (null != newValueINotifyCollectionChanged)
    {
        newValueINotifyCollectionChanged.CollectionChanged += new NotifyCollectionChangedEventHandler(newValueINotifyCollectionChanged_CollectionChanged);
    }
 }

void newValueINotifyCollectionChanged_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
     if (e.NewItems == null)
     {
         TotalCount = 0;
     }
     else
     {
         TotalCount = e.NewItems.Count;
     }
 }

 private ObservableCollection<myCustomClass> gridItemCollections;
 public ObservableCollection<myCustomClass> GridItemCollections
 {
     get { return gridItemCollections; }
     set
     {
         gridItemCollections = value;
         NotifyPropertyChanged("GridItemCollections");
     }
 }

 public void AddNewGridRow()
 {
    GridItemCollections.Add(CurrentDetail);
 }

现在的问题是，当我在视图模型上修改GridItemCollections时，为什么用户控件中的grid没有更新？这里是否缺少一些东西？

---

提前感谢。

您的DataGridFilterDetail控件中的OnItemSourceProperty发生了什么变化？这似乎没有必要。您也不需要在依赖项属性设置程序中引发PropertyChanged事件。UserControl通常不实现INotifyPropertyChanged.OnItemSourcePropertyChanged我为我的用户控件设置新集合如下：var control=sender as DataGridFilterDetail；如果控制！=null{control.onitemsourcechangedienumerablee.OldValue，IEnumerablee.NewValue；}我知道我不需要提升属性更改，我有点绝望：所以我尝试了这些。嗨，克莱门斯，我已经在我的问题中添加了源代码。嗨，克莱门斯，我已经在我的问题中添加了其余的代码。