C# TableLayout中的片段不绑定到viewmodel

我已经为此挣扎了两天了，我只是被卡住了。由于某种原因，片段的绑定根本不会生效。页面显示正确，选项卡工作正常。我可以从选项卡1滑动到选项卡2，反之亦然。TextView应该显示viewmodel中的一些文本。调试时，两个片段ViewModel的构造函数都会执行，但LoginNotificationViewModel（LoginDescription和LastLoginRequestReceivedOn）上的属性永远不会触发

我有一个视图，其中包含一个表格布局，如下所示：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <include
        layout="@layout/header" />
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/main_content"
        android:layout_below="@id/header">
        <android.support.design.widget.TabLayout
            android:id="@+id/sliding_tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            local:tabMode="fixed" />
        <android.support.v4.view.ViewPager
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="0px"
            android:layout_weight="1"
            android:background="@android:color/white" />
    </LinearLayout>
</RelativeLayout>

其中一个片段涉及：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
  <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_margin="30dp"
      local:MvxBind="Text LoginDescription" />
  <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_margin="30dp"
      local:MvxBind="Text LastLoginRequestReceivedOn"/>
</LinearLayout>

---

您需要使用

bindingfillate（）

而不是默认的Android充气器，因为它不知道如何处理MvxBind属性

使用MvvmCross.Binding.Droid.BindingContext；
...
创建视图上的公共覆盖视图（布局、充气机、视图组容器、捆绑包保存状态）
{
忽略变量=base.OnCreateView（充气机、容器、savedInstanceState）；
var view=this.BindingInflate（Resource.Layout.MyFragmentLayout，container，false）；
返回视图；
}

啊，我以前在某个地方的评论中看到过这一点。我没有在这个想法上找到它，也没有意识到它甚至是一种扩展方法。当我添加代码段时，我得到了一个NullReferenceException，似乎我还需要base.OnCreateView，因为它现在可以工作了。非常感谢你

namespace Notifier.ViewModels
{
    public class HomeNotificationViewModel : ViewModelBase
    {
        public override string SubTitle => "Notificatie";

        public override void InitView()
        {
        }

        public override void InitData()
        {
            // TODO: Init Data
        }

        public override void ApplicationSelected()
        {
        }

        public void ResetPincode()
        {
            DeviceRegistrationHelper.UpdatePincode(null, () =>
            {
                DetermineAndStartHomeView();
            });
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
  <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_margin="30dp"
      local:MvxBind="Text LoginDescription" />
  <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_margin="30dp"
      local:MvxBind="Text LastLoginRequestReceivedOn"/>
</LinearLayout>

using Android.OS;
using Android.Views;
using Notifier.ViewModels;

namespace Notifier.Android.Fragments
{
    public class LoginNotificationFragment : BaseFragment<LoginNotificationViewModel>
    {
        protected override int LayoutResource => Resource.Layout.LoginNotificationFragment;

        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            return inflater.Inflate(Resource.Layout.LoginNotificationFragment, container, false);
        }
    }
}

using MvvmCross.Droid.Support.V4;
using Notifier.Android.Views;
using Notifier.ViewModels;

namespace Notifier.Android.Fragments
{
    public abstract class BaseFragment<TViewModel> : MvxFragment<TViewModel>
        where TViewModel : ViewModelBase
    {
        protected abstract int LayoutResource { get; }
    }
}

using Notifier.Classes;
using System;
using System.Linq;

namespace Notifier.ViewModels
{
    public class LoginNotificationViewModel : ViewModelBase
    {
        public override string SubTitle => "Inlog notificatie";

        public String Status { get; set; }

        public override void InitView()
        {
        }

        public override void InitData()
        {
            // TODO: Init Data
        }

        public override void ApplicationSelected()
        {
        }

        public string LoginDescription
        {
            get => Settings.HasNotification 
                ? string.Format("Er is een inlog verzoek ontvangen voor {0}", ApplicationShortName(Settings.Notification.ApplicationId))
                : "Geen openstaande inlogverzoeken";
        }

        /// <summary>
        /// Short name for the application
        /// </summary>
        private string ApplicationShortName(int applicationId)
        {
            return Applications.Where(app => app.ApplicationID == applicationId).FirstOrDefault()?.ApplicationEntity.ApplicationShortName;
        }

        public string LastLoginRequestReceivedOn
        {
            get => string.Format("Laatste inlogverzoek: {0}", 
                Settings.HasLastNotificationReceivedOn 
                ? string.Empty
                : Settings.LastNotificationReceivedOn.ToString("DD-MM-YYYY HH:MM"));
        }
    }
}

namespace Notifier.ViewModels
{
    /// <summary>
    /// Base class for all view models.
    /// </summary>
    public abstract class ViewModelBase : MvxViewModel
    {
        private readonly IPlatformEntrance _platformEntrance;
        private readonly IPlatformLog _platformLog;

        public string Title => "nNotifier©";

        public ViewModelBase()
        {
            _platformEntrance = Mvx.Resolve<IPlatformEntrance>();
            _platformLog = Mvx.Resolve<IPlatformLog>();

            InitData();
        }

        public abstract void InitData();

        public abstract string SubTitle { get; }

        ...
    }
}

using Android.Content;
using Android.Support.V4.App;
using MvvmCross.Droid.Support.V4;

namespace Notifier.Adapters

{
    public class TabsFragmentPagerAdapter : MvxCachingFragmentStatePagerAdapter
    {
        FragmentInfo[] _fragments;

        public TabsFragmentPagerAdapter(Context context, FragmentManager fragmentManager, FragmentInfo[] fragments)
            : base(context, fragmentManager, fragments)
        {
            _fragments = fragments;
        }

        // public override int Count => _fragments.Length;

        //public override global::Android.Support.V4.App.Fragment GetItem(int position, 
        //    global::Android.Support.V4.App.Fragment.SavedState fragmentSavedState = null)
        //{
        //    return _fragments[position];
        //}

        //public override ICharSequence GetPageTitleFormatted(int position)
        //{
        //    return _titles[position];
        //}
    }
}