Question

以下代码似乎偶尔会产生这种堆栈跟踪。在内部FileStream对象上调用dispose方法时，它看起来是在框架内发生的吗？对我来说似乎是一个错误，任何想法？

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

修改 VersionFile路径就是这样抓住的：

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

Answer 1

如果我不得不猜测，我认为你可能会遇到竞争条件，因为在Flush()处理引擎盖FileStream期间发生隐式ReadAllText打电话。

（警告：不在单声道源之前，因此无法确认确切的行为）

是否有可能：

您正在更换/重新开放/等。另一个线程中的文件路径相同吗？
在另一个帖子之后或之后立即删除该路径？
否则会失去对已检查路径的访问权限？（文件共享卸载？）

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

1 个答案: