Question

我创建了一个类，我需要像其他UI控件一样拥有Visibility属性。它看起来像这样：

更多扩展代码：

XAML：

<ListBox x:Name="itemsHolder" >
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <TextBlock  Text="{Binding Name}" />
                            <TextBlock  Text="{Binding Surname}"/>
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

代码背后：

public ObservableCollection<MyClass > myVM= new ObservableCollection<MyClass>();

        public class MyClass : Control //FrameworkElement
                {
                    public string Name { get; set; }


                    public string Surname { get; set; }
                }
    ...
    MyClass my1 = new MyClass();
    my1.Name = "Test";
    my1.Surname = "Test2";
    myVM.Add(my1);
    itemsHolder.ItemsSource = myVm;
    ...

    private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
      {
        foreach(MyClass item in itemsHolder.Items)
        {
           if(!item.Name.Contains((sender as TextBox).Text))
           {
               item.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
           }
           else
           {
               item.Visibility = Windows.UI.Xaml.Visibility.Visible;
           }
        }
      }

我尝试做的是像过滤器（搜索），我想要隐藏项目。只是在类中添加属性也不起作用。

Answer 1

你非常接近......为了让你的类工作MyClass必须实现INotifyPropertyChanged，我使用基类bindable，这使得实现INotifyPropertyChanged变得更加简单。

以下是答案

XAML：

       <ListBox Grid.Row="1" x:Name="itemsHolder" >
              <ListBox.ItemTemplate>
                <DataTemplate>
                    <Grid Visibility="{Binding IsVisible}">
                        <TextBlock  Text="{Binding Name}" />
                        <TextBlock  Text="{Binding Surname}"/>
                    </Grid>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

代码：

 public ObservableCollection<MyClass > myVM= new ObservableCollection<MyClass>();



   public class Bindable:INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged = delegate { };

    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

 public class MyClass : Bindable   {

      private string _Name;
      public string Name {
          get { return _Name; }
          set
          {
              if (_Name != value)
              {
                  _Name = value;                      
                  OnPropertyChanged();
              }
          } 
      }
      private string _Surname;

      public string Surname
      {
          get { return _Surname; } 
          set{
              if (_Surname != value)
              {
                  _Surname = value;
                  OnPropertyChanged();
              }
          }
      }

      public Visibility _IsVisible;
      public Visibility IsVisible {
          get { return _IsVisible; }
          set {

              if (_IsVisible != value)
              {
                  _IsVisible = value;
                  OnPropertyChanged();
              }
          } 
      }
    }  


private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
  {
    foreach(MyClass item in itemsHolder.Items)
    {
       if(!item.Name.Contains((sender as TextBox).Text))
       {
           item.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
       }
       else
       {
           item.Visibility = Windows.UI.Xaml.Visibility.Visible;
       }
    }
  }

将Visibility属性实现到自定义类

1 个答案: