[英]How to find out which button I pressed?
从Facebook中查看通知下拉菜单。 我想实现类似的东西。 当点击“ Slet”时,应该从列表中删除该通知。
private void AddNotificationsToPanel(List<Notification> notifications, StackPanel panel)
{
panel.Children.Clear();
foreach (var notification in notifications)
{
//We want every message to have text, a delete button and a postpone button
//So we need a nested stackpanel:
var horizontalStackPanel = new StackPanel();
horizontalStackPanel.Orientation = Orientation.Horizontal;
panel.Children.Add(horizontalStackPanel);
//Display the message:
var text = new TextBlock();
text.Text = notification.Message;
text.Foreground = Brushes.Black;
text.Background = Brushes.White;
text.FontSize = 24;
horizontalStackPanel.Children.Add(text);
//Add a delete button:
var del = new Button();
del.Content = "Slet";
del.FontSize = 24;
del.Command = DeleteNotificationCommand;
horizontalStackPanel.Children.Add(del);
//Add a postpone button:
var postpone = new Button();
postpone.Content = "Udskyd";
postpone.FontSize = 24;
postpone.IsEnabled = false;
horizontalStackPanel.Children.Add(postpone);
}
panel.Children.Add(new Button { Content = "Luk", FontSize = 24, Command = ClosePopupCommand });
}
基本上,我有一个垂直的堆栈面板,其中包含x个水平的堆栈面板。 每个按钮都有一个文本框和两个按钮。 我怎么知道我点击了哪个按钮? 这些按钮都绑定到一个delete命令,但是我不确定它们是如何工作的:
public ICommand DeleteNotificationCommand
{
get{
return new RelayCommand(o => DeleteNotification());
}
}
然后创建该方法:
private void DeleteNotification()
{
Notifications.Remove(NotificationForDeletion);
AddNotificationsToPanel(Notifications, Panel);
}
问题是我们不知道要删除哪个通知,因为我不知道如何查看单击了哪个按钮。 有任何想法吗?
您应该通过为按钮分配每个通知的唯一标识符来使用按钮的CommandParameter属性。 我假设您的通知具有唯一的整数ID:
//Add a delete button:
var del = new Button();
del.Content = "Slet";
del.FontSize = 24;
del.Command = DeleteNotificationCommand;
del.CommandParameter = notification.Id; // <-- unique id
horizontalStackPanel.Children.Add(del);
然后,在DeleteNotification方法中,您需要为密钥指定一个参数。
public ICommand DeleteNotificationCommand
{
get{
return new RelayCommand(DeleteNotification);
}
}
private void DeleteNotification(object parameter)
{
int notificationId = (int)parameter;
var NotificationForDeletion = ...; // <--- Get notification by id
Notifications.Remove(NotificationForDeletion);
AddNotificationsToPanel(Notifications, Panel);
}
现在,在DeleteNotification中,您可以标识与按钮相关的通知。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.