xamarin App自动升级

xamarin ，android的APP自动更新程序，检测版本，然后下载安装

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.Content.PM;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

namespace App3
{
    [BroadcastReceiver]
    public class ApkInstallReceiver : BroadcastReceiver
    {
        long downloadApkId = 0;
        public override void OnReceive（Context context Intent intent）
        {
            //ACTION_DOWNLOAD_COMPLETE
            if （intent.Action.Equals（DownloadManager.ActionDownloadComplete））
            {
                installApk（context downloadApkId）;
            }
                Toast.MakeText（context “Received intent!“ ToastLength.Short）.Show（）;
        }
        private static void installApk（Context context long downloadApkId）
        {
            //File file = new File（fileUri）;
            //if （Build.VERSION.SdkInt >= Build.VERSION_CODES.N）
            //{
            //    Uri apkUri = FileProvider.GetUriForFile（context context.ApplicationContext.PackageName + “.provider“ toInstall）;
            //    Intent intentS = new Intent（Intent.ActionInstallPackage）;
            //    intentS.SetData（apkUri）;
            //    intentS.SetFlags（ActivityFlags.GrantReadUriPermission）;
            //    context.StartActivity（intentS）;
            //}
            //else
            //{
            //    Uri apkUri = Uri.FromFile（toInstall）;
            //    Intent intentS = new Intent（Intent.ActionView）;
            //    intentS.SetDataAndType（apkUri “application/vnd.android.package-archive“）;
            //    intentS.SetFlags（ActivityFlags.NewTask）;
            //    context.StartActivity（intentS）;
            //}

           
            
            DownloadManager dManager = （DownloadManager）context.GetSystemService（Context.DownloadService）;
            Intent install = new Intent（Intent.ActionView）;
            //获取保存文件的地址
            var downloadFileUri = dManager.GetUriForDownloadedFile（downloadApkId）;
            if （downloadFileUri != null）
            {
                //intent.SetDataAndType（Uri.Parse（“file://“ + filePath） “application/vnd.android.package-archive“）;
                install.SetDataAndType（downloadFileUri “application/vnd.android.package-archive“）;
                install.AddFlags（ActivityFlags.NewTask）;
                context.StartActivity（install）;
            }          
        }

        //获取APK包名、版本号
        private static PackageInfo getApkInfo（Context context String path）
        {
            //PackageInfo packageInfo = context.getPackageManager（）.getPackageInfo（localPackage 0）;
            PackageManager pm = context.PackageManager;
            PackageInfo info = pm.GetPackageArchiveInfo（path PackageInfoFlags.Activities）;
            
            if （info != null）
            {
                string packageName = info.PackageName;
                s

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2019-03-23 08:56  App3\
     目录           0  2019-03-23 08:53  App3\.vs\
     目录           0  2019-03-23 08:53  App3\.vs\App3\
     目录           0  2019-03-23 08:53  App3\.vs\App3\v15\
     文件      150016  2019-03-18 16:50  App3\.vs\App3\v15\.suo
     目录           0  2019-03-23 08:53  App3\.vs\App3\v15\Server\
     目录           0  2019-03-23 08:53  App3\.vs\App3\v15\Server\sqlite3\
     文件           0  2018-10-10 10:26  App3\.vs\App3\v15\Server\sqlite3\db.lock
     文件     1810432  2018-10-16 12:28  App3\.vs\App3\v15\Server\sqlite3\storage.ide
     文件       32768  2019-03-18 16:22  App3\.vs\App3\v15\Server\sqlite3\storage.ide-shm
     文件     2323712  2019-03-14 10:44  App3\.vs\App3\v15\Server\sqlite3\storage.ide-wal
     目录           0  2019-03-23 08:56  App3\App3\
     文件        1277  2018-10-10 10:25  App3\App3.sln
     文件        4351  2018-10-10 16:27  App3\App3\ApkInstallReceiver.cs
     文件        6809  2018-10-11 12:41  App3\App3\App3.csproj
     文件         432  2018-10-10 11:06  App3\App3\App3.csproj.user
     目录           0  2019-03-23 08:53  App3\App3\Assets\
     文件         641  2018-10-10 10:24  App3\App3\Assets\AboutAssets.txt
     目录           0  2019-03-23 08:53  App3\App3\bin\
     目录           0  2019-03-23 08:53  App3\App3\bin\Debug\
     文件    10653898  2018-10-11 12:51  App3\App3\bin\Debug\App3.App3-Signed.apk
     文件    10609024  2018-10-11 12:50  App3\App3\bin\Debug\App3.App3.apk
     文件       97280  2018-10-11 12:49  App3\App3\bin\Debug\App3.dll
     文件        5908  2018-10-11 12:49  App3\App3\bin\Debug\App3.pdb
     文件       29784  2018-10-10 10:56  App3\App3\bin\Debug\Mono.Android.Export.pdb
     文件    10574860  2018-10-10 10:36  App3\App3\bin\Debug\Mono.Android.pdb
     文件      151852  2018-10-10 10:36  App3\App3\bin\Debug\Mono.Security.pdb
     文件     1429232  2018-10-10 10:36  App3\App3\bin\Debug\mscorlib.pdb
     文件      106108  2018-10-10 10:36  App3\App3\bin\Debug\System.ComponentModel.Composition.pdb
     文件      386248  2018-10-10 10:36  App3\App3\bin\Debug\System.Core.pdb
     文件       43116  2018-10-10 10:36  App3\App3\bin\Debug\System.Net.Http.pdb
............此处省略1611个文件信息