C# 设置xamarin NavigationView菜单项字体

您好，我找到了如何为Android.Support.V7.Widget.Toolbar设置字体，但找不到如何为项目设置字体

我的菜单代码如下所示：

<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <group android:checkableBehavior="single">
    <item
      android:id="@+id/nav_some_item_one"
      android:title="One" />
    <item
      android:id="@+id/nav_some_item_two"
      android:title="Two" />
  </group>
</menu>

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawer_layout"
    android:fitsSystemWindows="true"
    tools:gridSpec="1|8|#0093eeff|K:#ee8700ff:16,l:72,l:16,r|S:#83ee00ff:16,0,l:16,56,l:16,0,r">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
    </RelativeLayout>
    <android.support.design.widget.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:id="@+id/nav_view"
        app:menu="@menu/navmenu"
        app:headerLayout="@layout/header" />
</android.support.v4.widget.DrawerLayout>

var navigationView = FindViewById<NavigationView>(Resource.Id.nav_view);
var item = navigationView.Menu.GetItem(1);

我的抽屉布局如下所示：

<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <group android:checkableBehavior="single">
    <item
      android:id="@+id/nav_some_item_one"
      android:title="One" />
    <item
      android:id="@+id/nav_some_item_two"
      android:title="Two" />
  </group>
</menu>

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawer_layout"
    android:fitsSystemWindows="true"
    tools:gridSpec="1|8|#0093eeff|K:#ee8700ff:16,l:72,l:16,r|S:#83ee00ff:16,0,l:16,56,l:16,0,r">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
    </RelativeLayout>
    <android.support.design.widget.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:id="@+id/nav_view"
        app:menu="@menu/navmenu"
        app:headerLayout="@layout/header" />
</android.support.v4.widget.DrawerLayout>

var navigationView = FindViewById<NavigationView>(Resource.Id.nav_view);
var item = navigationView.Menu.GetItem(1);

我可以从MainActivity中获得对我的单个菜单项的引用，如下所示：

<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <group android:checkableBehavior="single">
    <item
      android:id="@+id/nav_some_item_one"
      android:title="One" />
    <item
      android:id="@+id/nav_some_item_two"
      android:title="Two" />
  </group>
</menu>

<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/drawer_layout"
    android:fitsSystemWindows="true"
    tools:gridSpec="1|8|#0093eeff|K:#ee8700ff:16,l:72,l:16,r|S:#83ee00ff:16,0,l:16,56,l:16,0,r">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:minHeight="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
    </RelativeLayout>
    <android.support.design.widget.NavigationView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:id="@+id/nav_view"
        app:menu="@menu/navmenu"
        app:headerLayout="@layout/header" />
</android.support.v4.widget.DrawerLayout>

var navigationView = FindViewById<NavigationView>(Resource.Id.nav_view);
var item = navigationView.Menu.GetItem(1);

var navigationView=findviewbyd（Resource.Id.nav_视图）；
var item=navigationView.Menu.GetItem（1）；

引用类型为IMenuItem。是否可以在Xamarin中更改这些菜单项的字体？有很多使用Java的示例，但没有一个使用C#