C# 如何更新Xamarin表单列表视图'；创建列表后的ViewCell属性？

我希望能够更改自定义

ViewCell

上的绑定属性，并将其用于更新

ListView

项，但它似乎仅用于初始化视图，并且不会反映更改。请告诉我我错过了什么

在这里，我选择点击事件并尝试更改ViewCell的字符串，但没有成功：

private void DocChooser_ItemTapped(object sender, ItemTappedEventArgs e)
{
    var tappedItem = e.Item as DocumentChooserList.DocumentType;
    tappedItem.Name = "Tapped"; // How can I change what a cell displays here? - this doesn't work
}

以下是我的ViewCell代码：

class DocumentCellView : ViewCell
{
    public DocumentCellView()
    {
        var OuterStack = new StackLayout()
        {
            Orientation = StackOrientation.Horizontal,
            HorizontalOptions = LayoutOptions.FillAndExpand,
        };

        Label MainLabel;
        OuterStack.Children.Add(MainLabel = new Label() { FontSize = 18 });
        MainLabel.SetBinding(Label.TextProperty, "Name");

        this.View = OuterStack;
    }
}

这是我的listview类：

public class DocumentChooserList : ListView
{
    public List<DocumentType> SelectedDocuments { get; set; }

    public DocumentChooserList()
    {
        SelectedDocuments = new List<DocumentType>();
        this.ItemsSource = SelectedDocuments;
        this.ItemTemplate = new DataTemplate(typeof(DocumentCellView));
    }

    // My data-binding class used to populate ListView and hopefully change as we go
    public class DocumentType
    {
        public string Name { get; set; }
    }
}

使用此简单数据类：

public class DocumentType
{
    public string Name { get; set; }
}

---

我缺少的是在绑定到

ViewCell

的数据类上实现

INotifyPropertyChanged

接口

在我最初的实现中，DocumentType类只有一些简单的属性，如

string Name{get；set；}

，但要在

ViewCell

中反映它们的值，需要实现

inotifPropertyChanged

，以便在更改属性时通知绑定的

ViewCell

：

    public class DocumentType : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private void OnPropertyChanged(string nameOfProperty)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(nameOfProperty));
        }

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

        ...
    }
}

    public class DocumentType : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private void OnPropertyChanged(string nameOfProperty)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(nameOfProperty));
        }

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

        ...
    }
}