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XAML
<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？
如果您还没有这样做，例如在XAML中，您需要进行设置 DataContext 为你的约束力。也是因为 People 财产没有实施 INotifyPropertyChanged 你可能想要之前创建这个列表 InitializeComponent，至少在你设定之前 DataContext，确保在评估绑定时列表已准备就绪。你可以添加到你的 ObservableCollection 稍后但如果你在该点之后创建它而没有通知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" });
}
如果您还没有这样做，例如在XAML中，您需要进行设置 DataContext 为你的约束力。也是因为 People 财产没有实施 INotifyPropertyChanged 你可能想要之前创建这个列表 InitializeComponent，至少在你设定之前 DataContext，确保在评估绑定时列表已准备就绪。你可以添加到你的 ObservableCollection 稍后但如果你在该点之后创建它而没有通知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" });
}
将此行放在xaml.cs中的现有代码之后
this.DataContext = People;
并用你的xaml替换
ItemsSource="{Binding People}"
至
ItemsSource="{Binding}"