C# 如何将对子对象实例中属性的更改传达给视图？

我遇到数据绑定/视图刷新问题。当我的工作列表类的TotalTaskCount属性因未反映在我的视图中而更改时（视图仍在列中显示旧值）

我的数据结构与此类似：

包含datagrid的视图将其ItemSource属性绑定到视图模型中的属性，如下所示：

    <DataContext="{Binding DashBoardVM, Source={StaticResource Locator}}"/>
    <DataGrid ItemsSource="{Binding SelectedTeamToManage.Worklists}"
              AutoGenerateColumns = "true"/>

---

我只是不知道如何让viewmodel知道TeamWorkload observable集合中的更改并更新数据绑定。我在谷歌上搜索了关于嵌套属性、collectionchanged事件、冒泡属性更改事件的所有信息，但我看不到如何实现我在解决方案中找到的任何示例代码。我甚至不确定这是否是我的问题，但这是我最好的猜测。由于我对.NET、MVVM和C#都还比较陌生，因此任何提示都将非常感谢。

声明

PropertyChanged

事件与实际实现

INotifyPropertyChanged

接口不同

改变

public class Worklist
{
    public event PropertyChangedEventHandler PropertyChanged;
    ...
}

到

---

为了避免此错误，您可以从公共基类派生所有视图模型类，如下所示：

    public class DashBoardViewModel
    {
             Observable Collection <Worklist> TeamWorklists = new ObservableCollection <Worklist>();

             //Bound to ItemSource of the datagrid
             public TeamWorkload SelectedTeamToManage
             {
                get { return _selectedTeamToManage; }
                set 
                { 
                     _selectedTeamToManage = value;
                     RaisePropertyChanged("SelectedTeamToManage");
                }
             }
     }

public class TeamWorkload
{
     public string TeamName
     {
         get { return _teamName; }
         set { _teamName = value; }
     }

     public ObservableCollection<Worklist> WorkLists
     {
          get { return _teamWorkLists; }
          set 
          { 
            _teamWorkLists = value;             
          }
     }
}

public Class Worklist
{
     public event PropertyChangedEventHandler PropertyChanged;

     [DisplayName("Total Tasks Count")]
     public int TotalTasksCount
     {
        get { return _totalTasksCount; }
        set 
        { 
           _totalTasksCount = value;
           NotifyPropertyChanged("TotalTasksCount");
        }
     }

     private void NotifyPropertyChanged(string info)
     {
        var propChanged = PropertyChanged;
        if (propChanged != null)
        {
             propChanged(this, new PropertyChangedEventArgs(info));
        }
     }
}

public class ViewModelBase : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

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

---

声明

PropertyChanged

事件与实际实现

INotifyPropertyChanged

接口不同

改变

public class Worklist
{
    public event PropertyChangedEventHandler PropertyChanged;
    ...
}

到

---

为了避免此错误，您可以从公共基类派生所有视图模型类，如下所示：

    public class DashBoardViewModel
    {
             Observable Collection <Worklist> TeamWorklists = new ObservableCollection <Worklist>();

             //Bound to ItemSource of the datagrid
             public TeamWorkload SelectedTeamToManage
             {
                get { return _selectedTeamToManage; }
                set 
                { 
                     _selectedTeamToManage = value;
                     RaisePropertyChanged("SelectedTeamToManage");
                }
             }
     }

public class TeamWorkload
{
     public string TeamName
     {
         get { return _teamName; }
         set { _teamName = value; }
     }

     public ObservableCollection<Worklist> WorkLists
     {
          get { return _teamWorkLists; }
          set 
          { 
            _teamWorkLists = value;             
          }
     }
}

public Class Worklist
{
     public event PropertyChangedEventHandler PropertyChanged;

     [DisplayName("Total Tasks Count")]
     public int TotalTasksCount
     {
        get { return _totalTasksCount; }
        set 
        { 
           _totalTasksCount = value;
           NotifyPropertyChanged("TotalTasksCount");
        }
     }

     private void NotifyPropertyChanged(string info)
     {
        var propChanged = PropertyChanged;
        if (propChanged != null)
        {
             propChanged(this, new PropertyChangedEventArgs(info));
        }
     }
}

public class ViewModelBase : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

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

---

你试过调查全球财产变化事件吗？谢谢Rahul-我没有。我会调查的！你试过调查全球财产变化事件吗？谢谢Rahul-我没有。我会调查的！克莱门斯，我真不敢相信我错过了！这就成功了。万分感谢！如果您有多个视图模型类，您可以创建一个实现INotifyPropertyChanged并具有受保护的NotifyPropertyChanged方法的公共基类。克莱门斯，我真不敢相信我错过了这个！这就成功了。万分感谢！如果有多个视图模型类，则可以创建实现INotifyPropertyChanged并具有受保护的NotifyPropertyChanged方法的公共基类。