c# - WP8 中的 IsolatedStorageFileStream 不允许操作

Question

我见过很多类似的问题，我真的尝试了所有的解决方案，但似乎没有一个对我有用。

这是我现在拥有的:

        private readonly object _lock = new object();
        List<DataModel> dataList = new List<DataModel>();

        lock (_lock)
        {
            using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
            {
                try
                {
                    using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("Data.xml", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
                    {
                        XmlSerializer serializer = new XmlSerializer(typeof(List<DataModel>));
                            dataList = (List<DataModel>)serializer.Deserialize(stream);
                    }
                }
                catch (IsolatedStorageException e) { e.ToString(); }
            }
        }

错误发生在行 using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("Data.xml", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))。

我从我读到的其他解决方案中推断出这个错误主要发生在我想写入文件而其他人正在读取它或者同时执行该代码块几次时，我最终锁定文件。"

由于存在 lock、FileAccess.ReadWrite 和 FileShare.ReadWrite 语句，我很确定其他东西正在抛出它异常。

我的问题是什么可能引发异常 (IsolatedStorageException)，我该如何处理它？

这个没有InnerException。

编辑:根据 Kookiz 的建议，我添加了这些代码行

首先，我像这样创建我的 .xml 文件:

    public static void createDataXML()
    {
        List<DataModel> dataList = new List<DataModel>();

        using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
        {
            if (myIsolatedStorage.FileExists("Data.xml"))
            { return; }
            using (IsolatedStorageFileStream stream = myIsolatedStorage.CreateFile("Data.xml"))
            {
                try
                {
                    XmlSerializer serializer = new XmlSerializer(typeof(List<DataModel>));
                    serializer.Serialize(stream, dataList);
                }
                catch
                { }
            }
        }
    }

稍后，我使用以下代码进行填充:

            using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream stream = myIsolatedStorage.OpenFile("Data.xml", FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
                {
                    XmlSerializer serializer = new XmlSerializer(typeof(List<DataModel>));
                    using (XmlWriter xmlWriter = XmlWriter.Create(stream, xmlWriterSettings))
                    {
                        serializer.Serialize(xmlWriter, dataList);
                    }
                }
            }

Answer 1

我知道这是一种不太传统的方式，但它是一种方式。我正在尝试做其他事情，这就是结果。只需添加您需要的已知类型，这就可以了

[DataContractAttribute]
[KnownType (typeof(List<String>))]
public class SerializableObject
{
   [DataMember]
    public List<String> serFile { get; set; }
}
public static Object GetFile(String FileName)
{
    try
    {
      if (!IsolatedStorageFile.GetUserStoreForApplication().FileExists(FileName))
       {
         throw new System.ArgumentException("File Doesn't Exist In Isoloated Storage");
       }
    }
    catch { return null;  }

    Object ret = new Object();
    try
    {
      IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication();

      IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication();
      IsolatedStorageFileStream fileStream = myIsolatedStorage.OpenFile(@"\" + FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);


      SerializableObject serList = new SerializableObject();
      DataContractSerializer dsc = new DataContractSerializer(serList.GetType());
      ret = ((SerializableObject)dsc.ReadObject(fileStream)).serFile;
    }
    catch (Exception error) { throw new System.ArgumentException(error.Message); }
    return ret;
}

此处隐含的任务是您需要在 SerializableObject 实例中对其进行序列化。让我知道您是否也需要该代码

编辑

如许，保存文件功能

  public static void SaveFile(String FileName, List<String> File)
    {
        try
        {
            if (FileName.Length < 1)
            {
                throw new System.ArgumentException("File Name Must Not Be Empty");
            }
            if (IsolatedStorageFile.GetUserStoreForApplication().AvailableFreeSpace <= 0)
            {
                throw new System.ArgumentException("Isolated Storage Out of Memory - Please free up space.");
            }
            if (IsolatedStorageFile.GetUserStoreForApplication().FileExists(FileName))
            {
                throw new System.ArgumentException("File Already Exists - Please choose a unique name.");
            }
            if (File == null)
            {
                throw new System.ArgumentException("Cannot Save Null Files");
            }
        }
        catch (Exception e)
        {
            return;
        }
        try
        {
            SerializableObject so = new SerializableObject() { serFile = File };
            DataContractSerializer dsc = new DataContractSerializer(so.GetType());

            IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication();
            StreamWriter writer;

            writer = new StreamWriter(new IsolatedStorageFileStream(FileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite, file));

            dsc.WriteObject(writer.BaseStream, so);
        }
        catch (Exception error) { throw new System.ArgumentException(error.Message); }

    }

享受连载吧!