如何在xamarin android中读取本地存储？

using System;
using System.IO;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Widget;

namespace XamarinApp
{
    [Activity(Label = "XamarinApp", MainLauncher = true)]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.Main);

            // 读取本地存储中的文件
            string filePath = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "myfile.txt");
            string fileContent = File.ReadAllText(filePath);

            // 显示读取的文件内容
            TextView textView = FindViewById<TextView>(Resource.Id.textView);
            textView.Text = fileContent;
        }
    }
}

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />