【发布时间】:2011-11-08 16:57:51
【问题描述】:
我的表单上有一个 ListBox,它在后面的代码中绑定到 BindingList<T>,但没有显示 BindingList<T> 中的项目。
XAML:
<Window x:Class="MessageServer.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MessageServer"
Name="mainWindow" Title="Message Exchange Server"
Height="350" Width="525" Closing="Window_Closing">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<ListBox Name="OutputList" Grid.Row="0" />
<ListBox Name="Connected" Grid.Row="1" ItemsSource="{Binding ElementName=mainWindow, Path=ConnectedClients}">
<ListBox.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Path=FullIPAddress}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Grid>
代码隐藏:
private BindingList<Client> _ConnectedClients;
public BindingList<Client> ConnectedClients
{
get { return _ConnectedClients; }
set { _ConnectedClients = value; }
}
public class Client : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private TcpClient _tcpClient;
public TcpClient tcpClient
{
get { return _tcpClient; }
set
{
_tcpClient = value;
NotifyPropertyChanged();
}
}
public string FullIPAddress
{
get { return _tcpClient.Client.RemoteEndPoint.ToString(); }
}
public string IPAddress
{
get { return _tcpClient.Client.RemoteEndPoint.ToString().Split(':').ElementAt(0); }
}
public string PortNumber
{
get { return _tcpClient.Client.RemoteEndPoint.ToString().Split(':').ElementAt(1); }
}
public Client(TcpClient tcpClient)
{
this.tcpClient = tcpClient;
NotifyPropertyChanged();
}
private void NotifyPropertyChanged()
{
NotifyPropertyChanged("tcpClient");
NotifyPropertyChanged("FullIPAddress");
NotifyPropertyChanged("IPAddress");
NotifyPropertyChanged("PortNumber");
}
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
任何想法为什么列表框不显示项目? 不确定这是否值得一提,但是当将项目添加到 BindingList 时,这是在 UI 线程的单独线程上完成的。但我尝试过使用 Dispatcher.BeginInvoke() 但仍然无法正常工作...
【问题讨论】:
-
听起来你真的很想使用 ObservableCollection
。听起来 BindingList 应该可以工作,但是在这篇 SO 帖子中,他们似乎说 ObservableCollection 用于 WPF,而 BindingList 用于 Winforms:stackoverflow.com/questions/4284663/… -
我将 BindingList 更改为 ObservableCollection 类型,这没有问题,我必须做的唯一更改是从列表中添加/删除项目时,我必须在 UI 线程上执行此操作很容易实现(对于那些不知道的人)使用... Dispatcher.BeginInvoke(new Action(() => ConnectedClients.Add(client)));
标签: c# wpf data-binding