c# – 无法通过嵌套类型X访问外部类型X的非静态成员

但它会抛出错误：

Cannot access a non-static member of outer type

‘Android.Support.V4.App.Fragment’ via nested type

‘*******.Fragments.Dashboard.ViewAdapter`

我究竟做错了什么？

码：

public void ShowFragment(SupportFragment fragment) {
    var transaction = SupportFragmentManager.BeginTransaction();
    connectionStatus.Visibility = ViewStates.Gone;

    if (!ConnectionDetector.IsConnected(this)) {
        connectionStatus.Visibility = ViewStates.Visible;

        transaction.Detach(currentFragment);
        transaction.Commit();
        drawerLayout.CloseDrawer(leftDrawer);

        return;
    }

    if (fragment == currentFragment) {
        transaction.Detach(currentFragment);
        transaction.Attach(currentFragment);
        transaction.Commit();
        drawerLayout.CloseDrawer(leftDrawer);

        return;
    }

    transaction.SetCustomAnimations(Resource.Animation.slide_in,Resource.Animation.slide_out);
    transaction.Replace(Resource.Id.fragment_container,fragment);
    transaction.Commit();
    drawerLayout.CloseDrawer(leftDrawer);
    currentFragment = fragment;
}