如何从子窗口MVVM刷新datagrid [英] how to refresh datagrid from a child window MVVM

问题描述

我正在尝试在关闭子窗口时刷新数据网格。但它不起作用，请检查代码。我调试了代码，我可以看到它可以在子调用刷新函数时从父窗口获取数据。

Hi, I am trying to refresh a datagrid when closing a child window. But it doesnt work, please check the code. I debugged the code, and I can see it is able to get the data from the parent window when child call the refresh function.

子窗口关闭方法。

 foreach (System.Windows.Window window in System.Windows.Application.Current.Windows)
                        {
                            if (window.DataContext == this)
                            {
                                window.Close();
                                _viewmodel = new MainWindowViewModel();
                                _viewmodel.LoadPathData();
                            }
                        }

在父窗口中加载数据函数

load data function in parent window

 public void LoadPathData()
        {
            _ctx = new CourtFLOWEntities();
            ComboCollection.Source = _ctx.EncryptionStorages.Select(x => x).ToList();
        }

推荐答案

您正在创建MainWindowViewModel类的新实例并调用其LoadPathData（）...这没有多大意义。您希望看到任何东西如何以及在哪里得到更新？您要刷新的父窗口的引用在哪里？

You are creating a new instance of the MainWindowViewModel class and call its LoadPathData()...this doesn't make much sense. How and where are you expecting to see anything get refreshed? Where is the reference to the parent window that you want to refresh?

您可能希望将Application.Current.Windows中窗口的DataContext强制转换为MainWindowViewModel并调用LoadPathData（ ）此实例的方法：

You probably want to cast the DataContext of a window in the Application.Current.Windows to a MainWindowViewModel and call the LoadPathData() method of this instance:

foreach (System.Windows.Window window in System.Windows.Application.Current.Windows)
            {
                if (window.DataContext == this)
                {
                    window.Close();
                    continue;
                }

                MainWindowViewModel viewmodel = window.DataContext as MainWindowViewModel;
                if(viewmodel != null)
                    viewmodel.LoadPathData();
            }

希望有所帮助。

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