因此,我目前正在使用MVVM中的数据绑定。所以我的类从INotifyPropertyChanged
派生而来,我将我的控件绑定到我的类中的属性。通常,在创建事件时,您会使用类似于+= myMethod
的方法显式地订阅它,然而,当这样做时,我看不到+=
,但它仍然可以工作。
我的问题是..当我将控件绑定到属性时,控件如何订阅PropertyChanged
事件?控件是否隐式订阅事件?
public event PropertyChangedEventHandler PropertyChanged;
MasterViewModel
class MasterViewModel
{
public Username Username { get; } = new Username();
}
XAML
<TextBox Name="tbUsername" HorizontalAlignment="Left" Height="23" Margin="381,132,0,0" TextWrapping="Wrap" Text="{Binding Username.TheUsername}" VerticalAlignment="Top" Width="120"/>
班级
class Username : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public Username()
{
TheUsername = "Hello World!";
}
private string _username;
public string TheUsername
{
get { return _username; }
set
{
_username = value;
OnPropertyChanged("TheUsername");
}
}
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
https://stackoverflow.com/questions/50623277
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