c# - MonoTouch File.ReadAllText 在内部 FileStream.Dispose() 上抛出异常

Question

以下代码似乎偶尔会产生此堆栈跟踪。当在内部 FileStream 对象上调用 dispose 方法时，它看起来像是在框架内发生的？对我来说似乎是个错误，有什么想法吗？

var previousVersion = long.Parse(File.ReadAllText(Paths.VersionFile));

堆栈跟踪:

 System.IO.IOException: Invalid parameter
      at System.IO.FileStream.Dispose (Boolean disposing) [0x00000] in <filename unknown>:0 
      at System.IO.Stream.Close () [0x00000] in <filename unknown>:0 
      at System.IO.StreamReader.Dispose (Boolean disposing) [0x00000] in <filename unknown>:0 
      at System.IO.TextReader.Dispose () [0x00000] in <filename unknown>:0 
      at System.IO.File.ReadAllText (System.String path) [0x00000] in <filename unknown>:0 
      at CatalystHD.Shared.BaseLoginController.CheckIfFirstRunThisVersion () [0x00000] in <filename unknown>:0 
      at CatalystHD.Shared.BaseLoginController.ViewDidLoad () [0x00000] in <filename unknown>:0 
      at MonoTouch.UIKit.UIViewController.get_View () [0x00000] in <filename unknown>:0 
      at CatalystHD.IPad.RootViewController.AnimateTo (MonoTouch.UIKit.UIViewController aController, UIViewAnimationTransition transition) [0x00000] in <filename unknown>:0 
      at CatalystHD.IPad.RootViewController.Logout (Boolean timeout) [0x00000] in <filename unknown>:0 
      at CatalystHD.IPad.NotebookSelectionController.logoutButton_Clicked (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 
      at MonoTouch.UIKit.UIBarButtonItem Callback.Call (MonoTouch.Foundation.NSObject sender) [0x00000] in <filename unknown>:0 
      at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x00000] in <filename unknown>:0 
      at MonoTouch.UIKit.UIApplication.Main (System.String[] args) [0x00000] in <filename unknown>:0 
      at CatalystHD.Application.Main (System.String[] args) [0x00000] in <filename unknown>:0 

编辑VersionFile 路径是这样抓取的:

public static string VersionFile {
    get {
        var path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
        return Path.Combine(path, "version.dat");
    }
}

Answer 1

如果非要我猜的话，我认为您可能会因为隐式的 Flush() 而陷入竞争状态。在处理引擎盖下时发生的 FileStream在那ReadAllText称呼。

(注意:不是在单声道源前面，所以无法确认确切的行为)

是否有可能:

• 您正在更换/重新开放/等等。另一个线程中的相同文件路径？
• 在另一个线程之后或在另一个线程中立即删除该路径？
• 否则无法访问已检查的路径？ (文件共享卸载？)