Question

我正在使用MVVM模式开发一个 WPF应用程序，其中一个屏幕有一个DataGrid，并且在点击时有一个名为Add Unit的按钮，它会打开一个pop如下所示：

（我创建了一个新视图，并在单击此AddUnit按钮时调用此视图）。再次，此弹出窗口包含一个包含多行的数据网格，如下所示：

我的问题是如何能够将行数据（只有两列ItemCode和ItemName）从弹出数据网格绑定到主窗口（不更改主窗口中DataGrid上方的数据）希望我有意义或者还有其他正确的方法吗？

由于我是WPF和MVVM的新手，所以我真的很开心。任何帮助都非常感谢。

Answer 1

让我们创建这些DataContexts（弹出窗口和打开弹出窗口的网格）共享相同的服务（您可以在创建它们时将这些服务注入这些DataContexts）。每次弹出新行的网格选择时，都会更新此服务。此外，它（服务）将引发一个事件，以通知Popup网格中的选择发生的事实，并在EventArgs内发送所选数据。打开弹出窗口的网格的数据上下文将侦听共享服务事件，并将以您喜欢的方式更新其网格ItemSource集合。

<强>更新

    public class MainGridDataContext:BaseObservableObject
    {
    private readonly ILikeEventAggregator _sharedService;
    //here we inject the the interface
    public MainGridDataContext(ILikeEventAggregator sharedService)
    {
        _sharedService = sharedService;
        //listen to selection changed
        _sharedService.PopupGridSelectionHandler += SharedServiceOnPopupGridSelectionHandler;
    }

    //uncomment next c'tor if you don't have any injection mechanism,
    //you should add the SharedService property to the App class
    //public MainGridDataContext()
    //{
    //    //_sharedService = App.Current.
    //    var app = Application.Current as App;
    //    if (app != null)
    //    {
    //        _sharedService = app.LikeEventAggregator;
    //        _sharedService.PopupGridSelectionHandler += SharedServiceOnPopupGridSelectionHandler;
    //    }
    //}

    private void SharedServiceOnPopupGridSelectionHandler(object sender, PopupGridData popupGridData)
    {
        UpdateGridWithAPopupSelectedData(popupGridData);
    }

    //method that helps to update the grid, you can do that in multiple ways
    private void UpdateGridWithAPopupSelectedData(PopupGridData popupGridData)
    {
        //Update your DataGrid here.
    }
}

public class PopupDataContext:BaseObservableObject
{
    private readonly ILikeEventAggregator _sharedService;
    //here we inject the the interface
    public PopupDataContext(ILikeEventAggregator sharedService)
    {
        _sharedService = sharedService;
    }

    //uncomment next c'tor if you don't have any injection mechanism,
    //you should add the SharedService property to the App class
    //public PopupDataContext()
    //{
    //    //_sharedService = App.Current.
    //    var app = Application.Current as App;
    //    if (app != null)
    //    {
    //        _sharedService = app.LikeEventAggregator;
    //    }
    //}

    //... your logic

    private PopupGridData _selectedData;
    //you should bind the popup grid selected value to this property
    public PopupGridData SelectedData
    {
        get { return _selectedData; }
        set
        {
            _selectedData = value;
            OnPropertyChanged(() => SelectedData);
            _sharedService.OnPopupGridSelectionHandler(_selectedData);
        }
    }

    //... your logic
}



public class PopupGridData
{
    public object PopupGridSelectedData { get; set; }
}

共享服务代码

public interface ILikeEventAggregator
{
    event EventHandler<PopupGridData> PopupGridSelectionHandler;
    void OnPopupGridSelectionHandler(PopupGridData e);
}

public class LikeEventAggregator : ILikeEventAggregator
{
    public event EventHandler<PopupGridData> PopupGridSelectionHandler;

    public virtual void OnPopupGridSelectionHandler(PopupGridData e)
    {
        var handler = PopupGridSelectionHandler;
        if (handler != null) handler(this, e);
    }
}

如果您需要更多信息，请与我们联系。问候。

将弹出数据绑定到弹出窗口中使用MVVM在WPF中触发的屏幕

1 个答案: