wpf - StackPanel 在 MVVM 中的可见性

Question

I'm working with WPF using Prism ( MVVM). I wanted to set visibililty of StackPanel from ViewModel calss. The StackPanel's visibility is binded like :

 <StackPanel x:Name="spVisibility"  Orientation="Horizontal" 
          Visibility="{Binding spVisibility, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">

I've view model class like :

  public class SearchId : BindableBase, INotifyPropertyChanged
  {
      private Visibility _visibility = Visibility.Collapsed;

      private DelegateCommand<object> searchCommand;

      public event PropertyChangedEventHandler PropertyChanged;

      public SearchId()
      {
            searchCommand = new DelegateCommand<object>(this.SearchData);
      }///

       public Visibility spVisibility
       {
            get { return _visibility; }
            set
            {
                if (!string.Equals(_visibility, value))
                {
                    _visibility = value;
                    RaisePropertyChanged("spVisibility");
                }
            }
        }

        private void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, 
                 new PropertyChangedEventArgs  (propertyName));
            }

        }

        private async void SearchData(object parameter)
        {
            _visibility = Visibility.Visible;
        }
   }

But this not working. Please help me.

Answer 1

_visibility = Visibility.Visible正在设置私有(private)属性而不是使用公共(public)属性，所以 RaisePropertyChanged("spVisibility")正在被绕过。您需要使用 spVisibility = Visibility.Visible .