在ExpandableListView上获取System.InvalidCastException

Question

我正在使用带有扩展Xamarin的visual studio 2015来制作应用。当我尝试强制转换为ExpandableListView时，出现错误（System.InvalidCastException）。

using Android.App;
using Android.Widget;
using Android.OS;
using Android.Runtime;
using Android.Content;
using Android.Views;
using System.Collections.Generic;
using Android.Graphics;
using static Android.Widget.ListView;
using static Android.Widget.ExpandableListView;

namespace SecondApp
{
    [Activity(Label = "SecondApp", MainLauncher = true, Icon = "@drawable/icon", Theme = "@android:style/Theme.Holo.Light")]
    public class MainActivity : Activity
    {
    ExpandableListView expandableListView;
    ListView listView;


    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);
        SetContentView(Resource.Layout.Main);


        expandableListView = FindViewById<ExpandableListView>(Resource.Id.SavedAnimationsList);
        listView = FindViewById<ListView>(Resource.Id.animation);

     }
}

我希望你们能帮忙！

感谢。