当Property Changed不更新时,ListView不会更新
问题描述:
当更多数据添加到ObservableCollection时,我的UI未更新。控制台输出显示发生了类型'System.NullReferenceException'的第一次机会异常。我应该使用Inotifycollectionchanged吗?下面是一些代码:当Property Changed不更新时,ListView不会更新
<ListView x:Name="ListView2" ItemsSource="{Binding Source={x:Static d:GrabUserConversationModel._Conversation}, UpdateSourceTrigger=PropertyChanged}" SelectionChanged="ListView1_SelectionChanged">
UserConversationModel.cs
public class UserConversationModel : INotifyPropertyChanged
{
public UserConversationModel()
{
}
public string Name
{ get; set; }
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string Obj)
{
if (PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(Obj));
}
}
}
MainWindow.xaml.cs
public partial class MainWindow
{
static GrabUserConversationModel grabUserConversationModel;
public MainWindow()
{
InitializeComponent();
...
}
static void AddData()
{
grabUserConversationModel.Conversation.Add(new UserConversationModel { Name = "TestName" });
}
GrabUserConversationModel.cs
class GrabUserConversationModel
{
public static ObservableCollection<UserConversationModel> _Conversation = new ObservableCollection<UserConversationModel>();
public ObservableCollection<UserConversationModel> Conversation
{
get { return _Conversation; }
set { _Conversation = value; }
}
...
答
你的财产ObservableCollection<UserConversationModel> Conversation
不执行INotifyPropertyChanged
public ObservableCollection<UserConversationModel> Conversation
{
get { return _Conversation; }
set { _Conversation = value; OnPropertyChanged("Conversation");}
}
尝试删除你的'UpdateSourceTrigger'上绑定设置。让WPF钩住集合并捕获集合更改,就像它通常默认的那样。 – TyCobb 2015-02-07 22:56:36