我运行的是 Windows 10、Visual Studio 2015 和 Xamarin。我对 Xamarin 相当陌生（只是为了设置地面水平）。我最近更新后遇到了一个问题。我的应用程序在更新之前可以正常运行。我的所有文件都是只读的，更新之前没有任何问题。除此之外，我重建了该项目，并且还对该项目进行了“清理和重建”。我已经用我拥有的多个应用程序尝试过，其他应用程序没有这个问题。问题我收到以下错误。
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.
我读过一些文章，例如（我发布了谷歌搜索第三项，因为我读了顶部结果中的几乎所有内容）。我尝试以管理员身份运行该程序，并且该目录对任何人都开放访问。
- 为什么访问路径被拒绝？ https://stackoverflow.com/questions/8821410/why-is-access-to-the-path-denied
- System.UnauthorizedAccessException：对路径“...”的访问被拒绝 https://stackoverflow.com/questions/39534782/system-unauthorizedaccessexception-access-to-the-path-is-denied
对于任何对我如何访问我的文件的代码感到好奇的人，它如下。
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;
}
