Question

如果您将DirectoryInfo实例从PC1发送到PC2，GetFiles或GetDirectories是否还在工作？

public void DirTest()
    {
        //On first PC:

        DirectoryInfo driveC = new DirectoryInfo(@"C:\randomdir\");

        BinaryFormatter bf = new BinaryFormatter();
        MemoryStream ns = new MemoryStream();

        bf.Serialize(ns, driveC);
        SendStream(ns); //Sending the stream to the second PC


        //On second PC:


        ns = ReceiveStream(); //Receiving the stream from the first PC
        ns.Position = 0;
        DirectoryInfo di = (DirectoryInfo)bf.Deserialize(ns);

        //Does this work?
        foreach (FileInfo item in di.GetFiles())
        {
            Debug.WriteLine(item);
        }
    }

如果您在同一台PC上执行该代码，它可以工作，但我没有环境来测试它是否适用于2个不同的PC。

可能SubDirectories和Files保存在directoryinfo类的数组中，因为我找到了这个序列化函数：

Answer 1

嗯，只有在两台计算机上都有相同的目录名时才能使用它。我们来看看reference source ...

首先，DirectoryInfo继承FileSystemInfo，因此当您反序列化DirectoryInfo时，会调用此构造函数：

    [System.Security.SecurityCritical]  // auto-generated
    private DirectoryInfo(SerializationInfo info, StreamingContext context) : base(info, context)
    {
        Directory.CheckPermissions(string.Empty, FullPath, checkHost: false);
        DisplayPath = GetDisplayName(OriginalPath, FullPath);
    }

其中base是FileSystemInfo，并使用此构造函数：

    [ResourceExposure(ResourceScope.None)]
    [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)]
    protected FileSystemInfo(SerializationInfo info, StreamingContext context)
    {
        if (info == null)
            throw new ArgumentNullException("info");
        Contract.EndContractBlock();

        // Must use V1 field names here, since V1 didn't implement 
        // ISerializable.
        FullPath = Path.GetFullPathInternal(info.GetString("FullPath"));
        OriginalPath = info.GetString("OriginalPath");

        // Lazily initialize the file attributes.
        _dataInitialised = -1;
    }

因此，您可以看到序列化的唯一内容是FullPath和OriginalPath值。目录中的数据未被序列化，如果您调用DirectoryInfo.GetFiles()，您将枚举本地计算机中的文件，而不是首先序列化DirectoryInfo的计算机。实际上，源代码专门说Lazily initialize the file attributes，这意味着它们在被请求时被加载。

    // Returns an array of Files in the DirectoryInfo specified by path
    [ResourceExposure(ResourceScope.Machine)]
    [ResourceConsumption(ResourceScope.Machine)]
    public FileInfo[] GetFiles()
    {
        return InternalGetFiles("*", SearchOption.TopDirectoryOnly);
    }

哪个电话：

    // Returns an array of Files in the current DirectoryInfo matching the 
    // given search criteria (ie, "*.txt").
    [ResourceExposure(ResourceScope.Machine)]
    [ResourceConsumption(ResourceScope.Machine)]
    private FileInfo[] InternalGetFiles(String searchPattern, SearchOption searchOption)
    {
        Contract.Requires(searchPattern != null);
        Contract.Requires(searchOption == SearchOption.AllDirectories || searchOption == SearchOption.TopDirectoryOnly);

        IEnumerable<FileInfo> enble = FileSystemEnumerableFactory.CreateFileInfoIterator(FullPath, OriginalPath, searchPattern, searchOption);
        List<FileInfo> fileList = new List<FileInfo>(enble);
        return fileList.ToArray();
    }

再一次，您看到序列化信息中没有使用任何内容。

DirectoryInfo实例是否仍可在其他PC上运行？

1 个答案: