Xamarin表单：如何使用OnToggledEvent

Question

我的列表视图中有一个开关，我选择了一些项目，如下面的截图。

我正在尝试获取切换项的用户标识。 我尝试如下，但获得例外：

 public class MyToggledEventArgs : EventArgs
    {
        public UserProfileHBList MyItem { get; set; }
        public MyToggledEventArgs(UserProfileHBList item)
        {
            this.MyItem = item;
        }
    }

    void OnToggledEvent(object sender, MyToggledEventArgs args)
    {
        var item = args.MyItem;
        if (item != null)
        {
            Debug.WriteLine("Userid:>>"+item.userProfileTO.userId);
        }
    }

//模型类

public class DirectoryResponse
{
    public List<UserProfileHBList> userProfileHBList { get; set; }
}

public class UserProfileHBList
{
    public UserProfileTO userProfileTO { get; set; }
}

public class UserProfileTO
{
    public string userId { get; set; }
    public string firstName { get; set; }
    public string email { get; set; }
    public string lastName { get; set; }
}

有没有其他方法可以获取用户ID？

Answer 1

在OnToggledEvent(object sender, EventArgs args)中，我们可以根据您的层次结构获得父ViewCell：

public void OnToggledEvent(object sender, EventArgs args)
{
    Here I use a Grid to wrap the content so I need to use two Parent to find the ViewCell
    ViewCell cell = (sender as Switch).Parent.Parent as ViewCell;

    // If you set the list<UserProfileHBList> as the ListView's ItemsSource, we can find the model through BindingContext
    UserProfileHBList model = cell.BindingContext as UserProfileHBList;

    // Then the userId can be known
    if (model != null)
    {
        Debug.WriteLine("Userid:>>"+model.userProfileTO.userId);
    }

}