Question

所以我有一个非常简单的UI设计，带有ListView和一个按钮。我想在点击按钮时填充列表视图。

 <Grid>
        <Button Click="ButtonBase_OnClick" Content="Button" HorizontalAlignment="Left" Margin="349,259,0,0" VerticalAlignment="Top" Width="75"/>

        <ListView Margin="10,10,10,202" Name="lvUsers" ItemsSource="{Binding SomeData.Users}">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Name" Width="120" DisplayMemberBinding="{Binding Name}" />
                </GridView>
            </ListView.View>
        </ListView>

    </Grid>

我已将ListView的ItemSource属性绑定为SomeData.Users，这是一个ObservableCollectiuon，它应该在更新，添加，删除或刷新时通知UI。然后在我拥有列的下方，我将DisplayMember绑定到可观察集合的Name属性。

这是SomeData类

public class SomeData
    {
        public static ObservableCollection<User> Users { get; } = new ObservableCollection<User>();

        public static void Populate()
        {
            Users.Add(new User() { Name = "John Doe", Age = 42, Mail = "john@doe-family.com" });
            Users.Add(new User() { Name = "Jane Doe", Age = 39, Mail = "jane@doe-family.com" });
            Users.Add(new User() { Name = "Sammy Doe", Age = 7, Mail = "sammy.doe@gmail.com" });
        }
    }

    public class User
    {
        public string Name { get; set; }

        public int Age { get; set; }

        public string Mail { get; set; }
    }

这是MainWindow.cs

public MainWindow()
        {
            InitializeComponent();
        }

        private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
        {
            SomeData.Populate();
        }

afaik我不应该在任何地方设置DataContext ..对吗？

Answer 1

问题是您的Binding语法错误。您正在尝试绑定到静态属性，请尝试以下操作：

[Thu Jun 14 05:03:22.973799 2018] [ssl:trace2] [pid 13154] ssl_engine_rand.c(126): Init: Seeding PRNG with 144 bytes of entropy
[Thu Jun 14 05:03:22.973834 2018] [ssl:info] [pid 13154] AH01887: Init: Initializing (virtual) servers for SSL
[Thu Jun 14 05:03:22.973840 2018] [ssl:info] [pid 13154] AH01876: mod_ssl/2.4.25 compiled against Server: Apache/2.4.25, Library: OpenSSL/1.0.2h
[Thu Jun 14 05:03:22.973858 2018] [http2:debug] [pid 13154] mod_http2.c(103): AH03089: initializing post config dry run
[Thu Jun 14 05:03:22.974292 2018] [core:emerg] [pid 13154] (22)Invalid argument: AH00024: Couldn't set permissions on the rewrite-map mutex; check User and Group directives
AH00016: Configuration Failed

或者如果您使用的是WPF 4.5或更新版本：

"{Binding Source={x:Static YourNameSpace:SomeData.Users}}"

一个提示：像你这样的问题总是试着看看你的输出窗口并寻找"{Binding Path=(YourNameSpace:SomeData.Users)}"，这些通常是绑定表达式无法解析时发生的绑定异常。在你的情况下，我相信你会发现这个例外。

Answer 2

您必须为xaml设置DataContext。

将datacontext添加到主窗口

public MainWindow()
{
       InitializeComponent();
       this.DataContext = new SomeData();
}

并将xaml ItemsSource绑定更改为

ItemsSource="{Binding Users}"

为什么我的ListView没有绑定到ItemSource？

2 个答案: