C# WPF：如何在 window 关闭时调用具有数据绑定的方法？

Question

我已经使用 CaliburnMicro 为我的数据网格实现数据绑定：

<Window x:Class="TicketDemo.Views.ShellView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TicketDemo.Views"
        mc:Ignorable="d" FontSize="20"
        Title="ShellView" Height="450" Width="800"
        Closing="{Binding Path=OnClose}">
    <Grid>
        <DataGrid x:Name="Tickets" AlternatingRowBackground="LightGray" CanUserAddRows="True"
                  AutoGenerateColumns="False"
                  >
            <DataGrid.Columns>
                <DataGridTextColumn Header="Title" Binding="{Binding Path=Title}"/>
                <DataGridTextColumn Header="Content" Binding="{Binding Path=Content}"/>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

我尝试使用相同的数据绑定到 link 一个名为 OnClose() 的方法到 Closing 事件。

using Caliburn.Micro;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using TicketDemo.Models;

namespace TicketDemo.ViewModels
{
    class ShellViewModel : Screen
    {
        public BindableCollection<TicketModel> Tickets { get; set; }

        public ShellViewModel()
        {
            Tickets = SQLiteDataAccess.LoadTickets();
        }

        public void OnClose(object sender, EventArgs e)
        {
            MessageBox.Show("Window Closing");
        }
    }
}

当我调试程序时，我收到这条消息：

using Caliburn.Micro;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace TicketDemo.Views
{
    /// <summary>
    /// Interaction logic for ShellView.xaml
    /// </summary>
    public partial class ShellView : Window
    {
        public ShellView()
        {
            InitializeComponent();

            MessageBox.Show("Hello");
        }
    }
}

System.Windows.Markup.XamlParseException: ''Provide value on 'System.Windows.Data.Binding' threw an exception.' Line number '9' and line position '9'.'

InvalidCastException: Unable to cast object of type 'System.Reflection.RuntimeEventInfo' to type 'System.Reflection.MethodInfo'.

The SO post answering a question about this exception与按钮有关，但这是一个事件，所以我认为这对解决我的问题没有帮助。

Answer 1

如果您使用的是 caliburn，事件声明如下：

替换Closing="{Binding Path=OnClose}"

来自

cal:Message.Attach="[Event Closing] = [Action OnClose]"

(别忘了加上xmlns:cal="http://www.caliburnproject.org")

在 ViewModel 中你写：

    public void OnClose()
    {
        MessageBox.Show("Window Closing");
    }

C# WPF：如何在 window 关闭时调用具有数据绑定的方法？

C# WPF: How do I call a method with data binding when a window is closing?

c#

wpf

caliburn.micro