将二进制文件数据读入结构列表

Question

我有一个简单的程序可以将图书馆书籍（TBook 类型）列表写入二进制文件，如下所示：

static void SaveToFile(List<TBook> lib)
    {
        FileStream currentFile;
        BinaryWriter writerToFile;
        currentFile = new FileStream("MyLibrary.bin", FileMode.Create);
        writerToFile = new BinaryWriter(currentFile);
        foreach (TBook book in lib)
        {
            writerToFile.Write(book.Title);
            writerToFile.Write(book.Author);
            writerToFile.Write(book.Genre);
            writerToFile.Write(book.BookID);
        }
        writerToFile.Close();
        currentFile.Close();
    }

但是，当尝试读取二进制文件并将内容加载到列表中时，出现错误：

An unhandled exception of type 'System.IO.EndOfStreamException' occurred in mscorlib.dll

Additional information: Unable to read beyond the end of the stream.

这是我的子例程，它试图再次将二进制文件读回到结构中：

static List<TBook> LoadDataFromFile (List<TBook>library)
    {
        FileStream currentFile;
        BinaryReader readerFromFile;
        currentFile = new FileStream("MyLibrary.bin", FileMode.Open);
        readerFromFile= new BinaryReader(currentFile);

        while (currentFile.Position < currentFile.Length)
        {
            TBook CurrentRecord = new TBook();
            CurrentRecord.Title = readerFromFile.ReadString();
            CurrentRecord.Author = readerFromFile.ReadString();
            CurrentRecord.Genre = readerFromFile.ReadString();
            CurrentRecord.BookID = readerFromFile.ReadInt16();
            library.Add(CurrentRecord);                
       }

        readerFromFile.Close();
        currentFile.Close();
        return library;
    }

我认为问题出在以下行：

while (currentFile.Position < currentFile.Length)

注：结构体设置如下：

struct TBook
    {
        public string Title;
        public string Author;
        public string Genre;
        public int BookID;
    }

Answer 1

当您将数据序列化为二进制时，您的反序列化代码必须完全遵循序列化代码；否则你的反序列化器开始从相邻的位置读取垃圾，最终导致异常或用错误的数据静默填充你的结构。

这对调用不匹配：

writerToFile.Write(book.BookID);
....
CurrentRecord.BookID = readerFromFile.ReadInt16();

很难看出这个问题，因为BinaryWriter重载了Write方法。由于 book.BookID 是 int 类型，Int32 的别名，因此对 Write 的调用被解析为 Write(Int32)。所以对应的读也一定是Int32，而不是Int16:

CurrentRecord.BookID = readerFromFile.ReadInt32();

将二进制文件数据读入结构列表

Reading binary file data into List of Structs

c#

struct

binaryfiles