我有一个简单的过程,可以将库书列表(类型为TBook)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:
mscorlib.dll中发生了'System.IO.EndOfStreamException'类型的未处理异常
附加信息:在流的末尾无法读取。
这是我的子例程,尝试再次将二进制文件读回Struct:
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;
}
我认为问题在于:
while (currentFile.Position < currentFile.Length)
注意:Struct的设置如下:
struct TBook
{
public string Title;
public string Author;
public string Genre;
public int BookID;
}
当您将数据序列化为二进制时,反序列化代码必须严格遵循序列化代码;否则,解串器将开始从相邻位置读取垃圾,最终导致异常或使用错误数据静默填充结构。
这对电话不匹配:
writerToFile.Write(book.BookID);
....
CurrentRecord.BookID = readerFromFile.ReadInt16();
很难看到此问题,因为BinaryWriter
该Write
方法重载了。由于book.BookID
是类型int
的别名Int32
,因此对的调用Write
解析为Write(Int32)
。因此,相应的读取还必须读取Int32
,而不是Int16
:
CurrentRecord.BookID = readerFromFile.ReadInt32();
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