由于这是WPF,可能需要写很多代码,但不要被吓倒,问题实际上很简单!
我有以下XAML:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:hax="clr-namespace:hax" x:Class="hax.MainWindow"
x:Name="Window" Title="Haxalot" Width="640" Height="280">
<Grid x:Name="LayoutRoot">
<ListView ItemsSource="{Binding AllRoles}" Name="Hello">
<ListView.View>
<GridView>
<GridViewColumn Header="Name"
DisplayMemberBinding="{Binding Path=FullName}"/>
<GridViewColumn Header="Role"
DisplayMemberBinding="{Binding Path=RoleDescription}"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
我有这个代码后台:
using System.Collections.ObjectModel;
using System.Windows;
namespace hax
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public ObservableCollection<Role> AllRoles { get { return m_AllRoles; } set { m_AllRoles = value; } }
private ObservableCollection<Role> m_AllRoles = new ObservableCollection<Role>();
public MainWindow()
{
this.InitializeComponent();
AllRoles.Add(new Role("John", "Manager"));
AllRoles.Add(new Role("Anne", "Trainee"));
// Hello.ItemsSource = AllRoles; // NOTE THIS ONE!
}
}
}
如果我注释掉语句
Hello.ItemSource = AllRoles
,那么表格将不会显示任何内容。当我取消注释后,它会显示正确的内容。为什么会这样呢?