Question

当我们创建ICollectionView的自动属性时，刷新Employee集合后，CurrentChanged事件正常工作。

public ICollectionView EmployeeCollectionView{get; set; }

public EmployeeMasterViewModel(IEmployeeMasterView view, IUnityContainer container)
{
 GetEmployee();
 EmployeeCollectionView.CurrentChanged += new EventHandler(EmployeeCollectionView_CurrentChanged);
}

当我们创建full-property时，CurrentChanged事件无效。

private ICollectionView _employeeCollectionView;
public ICollectionView EmployeeCollectionView
 {
   get { return _employeeCollectionView; }
   set { _employeeCollectionView = value; OnPropertyChanged("EmployeeCollectionView");}
 }


public EmployeeMasterViewModel(IEmployeeMasterView view, IUnityContainer container)
{
   GetEmployee();
  EmployeeCollectionView.CurrentChanged += new EventHandler(EmployeeCollectionView_CurrentChanged);
}

 void EmployeeCollectionView_CurrentChanged(object sender, EventArgs e)
   {
    var currentEmployee = EmployeeCollectionView.CurrentItem as EmployeeMaster;
   }

如果我错过了什么，请建议。

Answer 1

您是否尝试将活动分配给私人会员？你是如何在xaml文件中完成绑定的？我会评论，但我没有足够的XP： - （

Answer 2

刷新员工代答后，您是否绑定了EmployeeCollectionView_CurrentChanged事件？因为如果刷新员工集合，则EmployeeCollectionView_CurrentChanged连接已丢失。

像 -

private void Refresh()
 {
   GetEmployee();
   EmployeeCollectionView.CurrentChanged += new EventHandler(EmployeeCollectionView_CurrentChanged);
}

Answer 3

如果您希望更改EmployeeCollectionView（看起来如此，否则您不需要OnPropertyChanged，我建议您在您的媒体资源中添加事件，如下所示：< / p>

private ICollectionView _employeeCollectionView;

public ICollectionView EmployeeCollectionView
{
  get { return _employeeCollectionView; }
  set
  {
    if (_employeeCollectionView != value)
    {
      if (_employeeCollectionView != null)
      {
        _employeeCollectionView.CollectionChanged -= EmployeeCollectionView_CurrentChanged;
      }
      _employeeCollectionView = value;
      _employeeCollectionView.CollectionChanged += EmployeeCollectionView_CurrentChanged;
      OnPropertyChanged("EmployeeCollectionView");
    }

  }
}


public EmployeeMasterViewModel(IEmployeeMasterView view, IUnityContainer container)
{
  GetEmployee();      
}

private void EmployeeCollectionView_CurrentChanged(object sender, EventArgs e)
{
  var currentEmployee = EmployeeCollectionView.CurrentItem as EmployeeMaster;
}

如果我们创建完整属性，ICollectionView的CurrentChanged事件不起作用

3 个答案: