XAML中的WPF ListView绑定ItemsSource

Question

我有一个简单的XAML页面,其上有一个像这样定义的ListView

<ListView Margin="10" Name="lvUsers" ItemsSource="{Binding People}">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Name" Width="120" DisplayMemberBinding="{Binding Name}" />
            <GridViewColumn Header="Age" Width="50" DisplayMemberBinding="{Binding Age}" />
            <GridViewColumn Header="Mail" Width="150" DisplayMemberBinding="{Binding Mail}" />
        </GridView>
    </ListView.View>
</ListView> 

在我做的代码中: -

public ObservableCollection<Person> People { get; set; }

public ListView()
{
    InitializeComponent();

    this.People = new ObservableCollection<Person>();
    this.People.Add(new Person() { Name = "John Doe", Age = 42, Mail = "john@doe-family.com" });
    this.People.Add(new Person() { Name = "Jane Doe", Age = 39, Mail = "jane@doe-family.com" });
    this.People.Add(new Person() { Name = "Sammy Doe", Age = 7, Mail = "sammy.doe@gmail.com" }); 

}   

如果我在后面的代码中设置listview的ItemsSource,就像这样

lvUsers.ItemsSource = this.People;

它工作,我的网格按预期显示

但是,如果我删除该行并尝试绑定在XAML中

<ListView Margin="10" Name="lvUsers" ItemsSource="{Binding People}">

它不再有效.

为什么XAML中的绑定不起作用？

Answer 1

如果您还没有这样做,例如在XAML中,您需要设置DataContext绑定.此外,由于People属性未实现,INotifyPropertyChanged您可能希望之前创建此列表InitializeComponent,至少在设置之前DataContext,确保在评估绑定时列表已准备就绪.您可以添加到您的ObservableCollection更高版本,但如果您在该点之后创建它而不通知UI它将无法工作

public ListView()
{
    this.People = new ObservableCollection<Person>();
    InitializeComponent();
    this.DataContext = this;

    this.People.Add(new Person() { Name = "John Doe", Age = 42, Mail = "john@doe-family.com" });
    this.People.Add(new Person() { Name = "Jane Doe", Age = 39, Mail = "jane@doe-family.com" });
    this.People.Add(new Person() { Name = "Sammy Doe", Age = 7, Mail = "sammy.doe@gmail.com" }); 
}

Answer 2

将这一行放在xaml.cs中的现有代码之后

this.DataContext = People;

并替换为您的xaml

ItemsSource="{Binding People}" 

至

ItemsSource="{Binding}"