訪問路徑被拒絕（Xamarin / Android）

Question

我正在運行Windows 10，Visual Studio 2015和Xamarin。 我對Xamarin很新（只是為了設定地面）。 我最近更新后遇到了一個問題。 我的應用程序在更新之前正在運行。 我的所有文件都是只讀的，在更新之前我沒有任何問題。 除此之外，我還重建了項目，並為項目“清理和重建”。 我已嘗試使用多個應用程序，其他應用程序沒有此問題。 問題我在下面收到以下錯誤。

06-26 13:51:55.108 I/MonoDroid( 6985): UNHANDLED EXCEPTION:
06-26 13:51:55.142 I/MonoDroid( 6985): System.UnauthorizedAccessException: Access to the path "/storage/emulated/0/defaultDirectory/users.ini" is denied.
06-26 13:51:55.142 I/MonoDroid( 6985):   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x001f1] in <3fd174ff54b146228c505f23cf75ce71>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions options, System.String msgPath, System.Boolean bFromProxy, System.Boolean useLongPath, System.Boolean checkHost) [0x00000] in <3fd174ff54b146228c505f23cf75ce71>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int,System.IO.FileOptions,string,bool,bool,bool)
06-26 13:51:55.142 I/MonoDroid( 6985):   at System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks, System.Int32 bufferSize, System.Boolean checkHost) [0x00067] in <3fd174ff54b146228c505f23cf75ce71>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks, System.Int32 bufferSize) [0x00000] in <3fd174ff54b146228c505f23cf75ce71>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at System.IO.StreamReader..ctor (System.String path, System.Boolean detectEncodingFromByteOrderMarks) [0x0000d] in <3fd174ff54b146228c505f23cf75ce71>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at System.IO.StreamReader..ctor (System.String path) [0x00000] in <3fd174ff54b146228c505f23cf75ce71>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at (wrapper remoting-invoke-with-check) System.IO.StreamReader:.ctor (string)
06-26 13:51:55.142 I/MonoDroid( 6985):   at System.IO.File.OpenText (System.String path) [0x00000] in <3fd174ff54b146228c505f23cf75ce71>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at QykAndroidApp.AdminLoginActivity.decryptUsers () [0x00033] in <65a7af1659a443738d96e6c2b7534ab2>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at QykAndroidApp.AdminLoginActivity.OnCreate (Android.OS.Bundle savedInstanceState) [0x0008a] in <65a7af1659a443738d96e6c2b7534ab2>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_ (System.IntPtr jnienv, System.IntPtr native__this, System.IntPtr native_savedInstanceState) [0x0000f] in <d855bac285f44dda8a0d8510b679b1e2>:0 
06-26 13:51:55.142 I/MonoDroid( 6985):   at (wrapper dynamic-method) System.Object:28564880-3429-412d-9c61-4f5bb9fc103e (intptr,intptr,intptr)
06-26 13:51:55.153 W/art     ( 6985): JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable
An unhandled exception occured.

我讀過很少的文章（我發布了谷歌搜索第3項，因為我讀了幾乎所有頂級結果）。 我嘗試以管理員身份運行該程序，該目錄可以對任何人開放。

• 為什么拒絕訪問路徑？
• System.UnauthorizedAccessException：拒絕訪問路徑“...”
• https://www.google.com/search?q=RegisterNativeMethods%3A+attempt+to+register+0+native+methods+for+android.runtime.JavaProxyThrowable&oq=RegisterNativeMethods%3A+attempt+to+register+0+天然+方法+為android.runtime.JavaProxyThrowable＆AQS = chrome..69i57j69i58.572j0j7＆的SourceID =鉻＆即= UTF-8

對於任何對我如何訪問我的文件的代碼感興趣的人，它在下面。

 private List<string> readUsers()
    {
        adminUsers = new List<string>();
        try
        {
            StreamReader readerForFile;

            //create checks for making sure the card is mounted, the directory is found, and the file is found. 
            var filePath = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.Path, "defaultDirectory/users.ini");

            File.SetAttributes(filePath, FileAttributes.Normal);

            if (File.Exists(filePath))
            {
                //Reads enttire document
                //var fillContent = File.ReadAllText(filePath);
                readerForFile = File.OpenText(filePath);
                if (readerForFile == null) { return null; }
                else
                {
                    string line = "";
                    int counter = 0;
                    while ((line = readerForFile.ReadLine()) != null)
                    {
                        adminUsers.Add(line);
                        counter++;
                    }
                }
            }

        }
        catch (IOException e)
        {
            //You'll need to add proper error handling here
            alert.SetMessage("File was not found. " + e).SetNeutralButton("Okay", delegate { QuestionActivity.exit(); }).Create().Show();
        }

        return adminUsers;
    }

Answer 1

您應該在Android中啟用READ_EXTERNAL_STORAGE和WRITE_EXTERNAL_STORAGE權限。 您可以關注此博客以在運行時啟用權限https://devblogs.microsoft.com/xamarin/requesting-runtime-permissions-in-android-marshmallow/