访问路径被拒绝（Xamarin/Android）

我运行Windows 10，Visual Studio 2015和Xamarin。我对Xamarin相当陌生（只是设置底层）。我最近更新后目前遇到问题。更新前我的应用程序正在运行。我的所有文件都是只读的，在更新之前我没有任何问题。除此之外，我还重建了项目，并为项目重建了“清理和重建”。我已经用我有多个应用程序尝试过了，其他应用程序没有这个问题。这个问题我得到下面的错误。访问路径被拒绝（Xamarin/Android）

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.

我读过几篇文章，例如（我发布了第三项的Google搜索，因为我几乎读了最重要的结果中的所有内容）。我已经尝试以管理员身份运行该程序，并且该目录已向任何人开放。

对于任何关于我如何访问我的文件的代码好奇，这是下面。

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; 
    }

来源

2017-06-26 victoryangyang

“我的应用程序在更新之前正在运行。”您可以尝试从设备上卸载您的应用并再次部署。 –

您应该在Android中启用READ_EXTERNAL_STORAGE和WRITE_EXTERNAL_STORAGE权限。您可以关注此博客，以启用运行时权限 https://blog.xamarin.com/requesting-runtime-permissions-in-android-marshmallow/

来源

2017-06-27 10:50:43

访问路径被拒绝（Xamarin/Android）

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