c# - UWP - 项目中包含的文件出现 UnauthorizedAccessException

Question

我正在 Visual Studio 2015 社区中编写一个 UWP 应用程序，当我运行构建并且该应用程序尝试打开我使用 Project | 添加到项目中的文件时出现以下异常从 VS 添加新项目。

System.UnauthorizedAccessException was unhandled by user code
  HResult=-2147024891
  Message=Access to the path 'C:\Users\garre\documents\visual studio 2015\Projects\ProjectManager\ProjectManager\bin\x86\Debug\AppX\projectdates.xml' is denied.
  Source=ProjectManager
  StackTrace:
       at ProjectManager.DataController.<CheckDates>d__5.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
       at ProjectManager.MainPage.<<projectsPivot_Click>b__21_0>d.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
       at ProjectManager.MainPage.<projectsPivot_Click>d__21.MoveNext()
  InnerException: 

这是试图访问该文件的代码片段:

XmlReader xml = XmlReader.Create(
    File.Open("projectdates.xml", FileMode.Open, FileAccess.Read)
);

最后，这是我的解决方案树的屏幕截图:

我已经检查过该文件是否存在(在 VS 的属性 View 中复制设置为“如果较新则复制”)并且权限是这样的，我的用户帐户可以访问它(读/写/执行)。我什至尝试以管理员权限打开 VS，但没有成功。

编辑: 以下是收到异常之前 XML 的属性:

编辑 2: 好吧，我已经尝试使用 StorageFile 方法访问文件，现在我得到了这个新的异常:

System.UnauthorizedAccessException was unhandled by user code
  HResult=-2147024891
  Message=Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
  Source=mscorlib
  StackTrace:
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
       at ProjectManager.DataController.<GetData>d__6.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
       at ProjectManager.MainPage.<<projectsPivot_Load>b__21_0>d.MoveNext()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
       at ProjectManager.MainPage.<projectsPivot_Load>d__21.MoveNext()
  InnerException: 

Answer 1

您看到的异常可能是由于 Windows 通用应用程序中的沙盒造成的。但是，File.Open 的文档没有提到它。

通常在 Windows 运行时应用程序中，您必须使用 StorageFile而不是文件流:

using System.IO;
using System.Threading.Tasks;
using System.Xml;
using Windows.Storage;
using Windows.ApplicationModel;

async public Task ReadXmlFile()
{
    // Use ONE of the following lines to get the file:
    var sf = await Package.Current.InstalledLocation.TryGetItemAsync("projectdates.xml") as StorageFile;
    var sf = await StorageFile.GetFileFromApplicationUriAsync(new Uri(@"ms-appx:///projectdates.xml"));

    var stream = await sf.OpenStreamForReadAsync();
    XmlReader xml = XmlReader.Create(stream);
    ...
}