Question

我从流中读取ZipInputStream。有10个ZipEntries，但所有的大小都是-1！我无法弄清楚为什么，因为有数据，所以它必须是＆gt;这是我的代码：

var zipInputStream = new ZipInputStream(new MemoryStream(reports));
ZipEntry zipEntry;
while ((zipEntry = zipInputStream.GetNextEntry()) != null)
{
    var fileName = Path.GetFileName(zipEntry.Name);
    if (String.IsNullOrEmpty(fileName)) continue;

    var identifier = fileName.Split('.')[1];
    var buffer = new byte[zipEntry.Size];
    zipInputStream.Read(buffer, 0, buffer.Length);
    var report = encoding.GetString(buffer);
            ...
}

在var buffer = new byte[zipEntry.Size]行上我有一个OverflowException。当我检查zipEntry.Size时 - 它总是-1。如果我写var buffer = new byte[4096]例如它没关系，但不正确。请问有什么想法吗？提前谢谢！

Answer 1

这里，0表示“没有数据”; -1表示不知道数据的大小。那么，您最好的选择是阅读该条目的结尾。也许：

MemoryStream ms = new MemoryStream();
while ((zipEntry = zipInputStream.GetNextEntry()) != null)
{
    var fileName = Path.GetFileName(zipEntry.Name);
    if (String.IsNullOrEmpty(fileName)) continue;

    var identifier = fileName.Split('.')[1];
    ms.SetLength(0); // reset between iterations, but let it re-use the memory
    zipInputStream.CopyTo(ms);
    var report = encoding.GetString(ms.GetBuffer(), 0, (int)ms.Length);
}

为什么ZipEntry.Size始终为-1

1 个答案: