WPF 列表框绑定更新

问题描述

我是 WPF 的新手，我只是设法将特定类项的列表绑定到 ListBox.ListBox 现在成功地显示它们.这是一些代码，首先是类:

I'm brand new to WPF and I just managed to bind a list of specific class items to a ListBox. The ListBox now successfully displays them. Here's some code, the class first:

public class OrderItem
{
    public int Quantity { get; set; }
    public string Name { get; set; }
    public Double Price { get; set; }
}

一些虚拟数据和绑定，这一切都发生在主程序的构造函数中:

Some dummy data and the binding, which all happens in the constructor of the main program:

List<OrderItem> currentOrderItems = new List<OrderItem>();
        currentOrderItems.Add(new OrderItem() { Quantity = 5, Name = "Test", Price = 5 });
        currentOrderItems.Add(new OrderItem() { Quantity = 15, Name = "Test test", Price = 6.66 });
        currentOrderItems.Add(new OrderItem() { Quantity = 1, Name = "Test 3", Price = 15.88 });
        listOrderItems.ItemsSource = currentOrderItems;

还有 XAML:

<ListBox HorizontalAlignment="Left" Margin="150,27,0,23" Name="listOrderItems" Width="150" FontFamily="Times New Roman" FontSize="12">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <Grid Margin="4">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="Auto" />
                    </Grid.ColumnDefinitions>
                    <TextBlock Text="{Binding Quantity}" FontWeight="Bold"  />
                    <TextBlock Grid.Column="1" Text="{Binding Name }" />
                    <TextBlock Grid.Column="2" Text="{Binding Price }" />
                </Grid>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

我的问题是如何更新 ListBox 以显示我添加到包含数据(又名 OrderItems)的列表中的新项目.如果我以任何方式添加、删除或修改列表，这不会反映在 ListBox 中.谢谢！

My question is how can I update the ListBox to display a new item that I'm adding to the List containing the data a.k.a. the OrderItems. If I add, remove or modify the List in any way, this is not reflected in the ListBox. Thanks!

推荐答案

对于您的情况，最好的方法是使用 mvvm 模式.简单来说:您的模型 OrderItem 应该实现接口 INotifyPropertyChanged.如果属性发生变化，它会通知这一点.然后创建视图模型并将其设置在数据上下文中.在 viewModel 中添加 ObservableCollection 和 OrderItems，这个集合应该通知视图它的变化.有关更多信息，请阅读以下文章:MVVM

For your case best way use mvvm patern. In brief: Your model OrderItem should implement interface INotifyPropertyChanged. If property changed, it notified about this. Then create viewmodel and set it in datacontext. In viewModel add ObservableCollection with OrderItems, this collection should notified view about changes in it. for more information read some articles like this: MVVM

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