Question

我知道这个问题已被多次询问，但我几乎尝试过所有事情，但没有运气。所以请帮忙。

一些全局变量：

private string _DirectoryForLogin = "LoginFiles", _FileForLogin = "Login.startup";
private IsolatedStorageFile _GlobalAccessRight = IsolatedStorageFile.GetUserStoreForApplication();

_DirectoryForLogin存储存储登录信息的目录名称，_FileForLogin存储保存为.startup的txt文件（我不认为这是问题）。

在InitializeCompolnent（）之后，我这样做：

using(_GlobalAccessRight){
            //Checking if directory exists; case when user had already been logged in.
            if (_GlobalAccessRight.DirectoryExists(_DirectoryForLogin))
            {
                //Check if login startup file is already created.
                if (_GlobalAccessRight.FileExists(_DirectoryForLogin + "\\" + _FileForLogin))
                {
                    //Not of much concern for you people.
                    _UserNameLabel.Text = "Please wait.... Logging in.";
                    _UserNameHolder.BorderThickness = new Thickness(0);
                    _UserNameHolder.IsEnabled = false;
                    _PasswordLabel.Text = "";
                    _PasswordHolder.BorderThickness = new Thickness(0);
                    _PasswordHolder.IsEnabled = false;
                    _LoginButton.BorderThickness = new Thickness(0);
                    _LoginButton.Content = "";
                    _LoginButton.IsEnabled = false;

                }
                else
                    _GlobalAccessRight.CreateFile(_DirectoryForLogin + "\\" + _FileForLogin);
                //This part basically only creates the file, if directory was already existing.
            }
            else
            {
                    //Creates directory as well as file.
                    _GlobalAccessRight.CreateDirectory(_DirectoryForLogin);
                    _GlobalAccessRight.CreateFile(_DirectoryForLogin + "\\" + _FileForLogin);

            }
        }

到目前为止一切正常。问题是如果我在创建目录后尝试删除目录，它会向我发送一个错误：“在IsolatedStorage上不允许操作”。但是我暂时解决了这个问题，只是一直关闭我的模拟器，以便获得一个新的IsolatedStorage位置。

接下来，我将从用户的文本和密码框中获取输入，并通过以下代码将其写入上面的文件：

        using(_GlobalAccessRight){
            //I have also tried by giving the FileShare argument below.
            using(IsolatedStorageFileStream WritingStreamForLoginInfo = new IsolatedStorageFileStream(_DirectoryForLogin + "\\" + _FileForLogin, FileMode.OpenOrCreate, FileAccess.ReadWrite, _GlobalAccessRight)){
                using(StreamWriter WritingLoginInfo = new StreamWriter(WritingStreamForLoginInfo)){
                    String _LoginCredentials = "UserName: ";
                    _LoginCredentials += _UserNameHolder.Text;
                    _LoginCredentials += "\n";
                    _LoginCredentials = "Password: ";
                    _LoginCredentials += _PasswordHolder.Password;

                    //I added this afterwards. Before it was not here. And still it was not working.
                    WritingLoginInfo.Flush();
                    WritingLoginInfo.Write(_LoginCredentials.ToCharArray(), 0, _LoginCredentials.Length);
                    WritingLoginInfo.Close();
                    WritingStreamForLoginInfo.Close();
                }//End of 1st using clause
            }//End of second using clause
        }//End of third using clause

上述编写代码在登录按钮的Tap事件上执行的功能中执行。代码发送此错误：商店必须为此操作开放。

例外细节：

System.ObjectDisposedException未处理

Message = Store必须为此操作打开。

堆栈跟踪：

   at System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, IsolatedStorageFile isf)

   at System.IO.IsolatedStorage.IsolatedStorageFileStream..ctor(String path, FileMode mode, FileAccess access, IsolatedStorageFile isf)

   at SafeMessenger.MainPage._LoginButton_Tap(Object sender, GestureEventArgs e)

   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)

   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

现在最后一件事我应该告诉你们。在我这样做之前，为每件事创建一个单独的IsolatedStorageFile对象。这是在上面的代码和目录创建代码中。那时我收到了这个错误： “在IsolatedStorage上不允许操作。”

现在我试图查看各种变量的调试细节，我发现这可能对你的人有所帮助。记住_GlobalAccessRight是IsolatedStorageFile类型的全局私有变量。

配额'this._GlobalAccessRight.Quota'抛出类型'System.ObjectDisposedException'的异常long {System.ObjectDisposedException}

请帮助我。感谢您的时间和任何帮助，提前。这将是一个很大的帮助。

Answer 1

因此，经过阅读和思考，我终于让我的代码独立工作了。首先是由于我对流的处理不当而引发了不允许操作的错误。

首先，我更改了这些内容：

.
.
.
}
 else
     _GlobalAccessRight.CreateFile(_DirectoryForLogin + "\\" + _FileForLogin);
            //This part basically only creates the file, if directory was already existing.
}
else
    {
        //Creates directory as well as file.
         _GlobalAccessRight.CreateDirectory(_DirectoryForLogin);
         _GlobalAccessRight.CreateFile(_DirectoryForLogin + "\\" + _FileForLogin);
    }

要：

.
.
.
}
 else
     _GlobalAccessRight.CreateFile(_DirectoryForLogin + "\\" + _FileForLogin).Dispose();
            //This part basically only creates the file, if directory was already existing.
}
else
    {
        //Creates directory as well as file.
         _GlobalAccessRight.CreateDirectory(_DirectoryForLogin);
         _GlobalAccessRight.CreateFile(_DirectoryForLogin + "\\" + _FileForLogin).Dispose();
    }

第二个错误是：我全局声明了IsolatedStorageFile对象。在我的第一个使用块中使用它之后：

using(_GlobalAccessRight){
        //Checking if directory exists; case when user had already been logged in.
        if (_GlobalAccessRight.DirectoryExists(_DirectoryForLogin))
        {

。。。。它被置于最后。因此，当我在函数中再次使用它时：

using(_GlobalAccessRight){
        //I have also tried by giving the FileShare argument below.
        using(IsolatedStorageFileStream WritingStreamForLoginInfo = new IsolatedStorageFileStream(_DirectoryForLogin + "\\" + _FileForLogin, FileMode.OpenOrCreate, FileAccess.ReadWrite, _GlobalAccessRight)){
            using(StreamWriter WritingLoginInfo = new StreamWriter(WritingStreamForLoginInfo)){
                String _LoginCredentials = "UserName: ";

。。。它告诉我错误说明： “商店必须是开放的。”

所以我把它改成了这个：

using(_GlobalAccessRight = IsolatedStorageFile.GetUserStoreForApplication()){
        using(IsolatedStorageFileStream WritingStreamForLoginInfo = new IsolatedStorageFileStream(_DirectoryForLogin + "\\" + _FileForLogin, FileMode.OpenOrCreate, FileAccess.ReadWrite, _GlobalAccessRight)){
            using(StreamWriter WritingLoginInfo = new StreamWriter(WritingStreamForLoginInfo)){
                String _LoginCredentials = "UserName: ";

多数民众赞成！好样的！：）

Answer 2

尝试删除这两行：

WritingLoginInfo.Close();
WritingStreamForLoginInfo.Close();

using块应该自动打开和关闭/处理流。可能是由于代码试图在using块结束时关闭已经关闭的连接而导致错误“Store必须为此操作打开”。

在IsolatedStorageFileStream上不允许操作 - WP7 C＃

2 个答案: