C# 使用ZipOutputStream归档多个文件会给我一个空的归档文件
我试图下载一堆文件,我正在通过ZipoutStream压缩(归档)C# 使用ZipOutputStream归档多个文件会给我一个空的归档文件,c#,.net,memorystream,sharpziplib,C#,.net,Memorystream,Sharpziplib,我试图下载一堆文件,我正在通过ZipoutStream压缩(归档) using (var zipStream = new ZipOutputStream(outputMemStream)) { foreach (var documentIdString in documentUniqueIdentifiers) { ... var blockBlob = container.GetBlockBlobReference(documentId.T
using (var zipStream = new ZipOutputStream(outputMemStream))
{
foreach (var documentIdString in documentUniqueIdentifiers)
{
...
var blockBlob = container.GetBlockBlobReference(documentId.ToString());
var fileMemoryStream = new MemoryStream();
blockBlob.DownloadToStream(fileMemoryStream);
zipStream.SetLevel(3);
fileMemoryStream.Position = 0;
ZipEntry newEntry = new ZipEntry(document.FileName);
newEntry.DateTime = DateTime.Now;
zipStream.PutNextEntry(newEntry);
fileMemoryStream.Seek(0, SeekOrigin.Begin);
StreamUtils.Copy(fileMemoryStream, zipStream, new byte[4096]);
zipStream.IsStreamOwner = false; // False stops the Close also Closing the underlying stream.
}
outputMemStream.Seek(0, SeekOrigin.Begin);
return outputMemStream;
}
在我的控制器中,我返回以下代码,这些代码应该下载我在上一个示例中创建的Zip文件。控制器操作在浏览器中下载文件,但存档文件为空。我可以看到从上面的方法返回的内容长度
file.Seek(0, SeekOrigin.Begin);
return File(file, "application/octet-stream", "Archive.zip");
有人知道为什么我的控制器返回的文件是空的或损坏的吗?我认为您需要关闭条目和最终的压缩流。您还应该
使用
并处理所有流。试试这个:
using (var zipStream = new ZipOutputStream(outputMemStream))
{
zipStream.IsStreamOwner = false;
// Set compression level
zipStream.SetLevel(3);
foreach (var documentIdString in documentUniqueIdentifiers)
{
...
var blockBlob = container.GetBlockBlobReference(documentId.ToString());
using (var fileMemoryStream = new MemoryStream())
{
// Populate stream with bytes
blockBlob.DownloadToStream(fileMemoryStream);
// Create zip entry and set date
ZipEntry newEntry = new ZipEntry(document.FileName);
newEntry.DateTime = DateTime.Now;
// Put entry RECORD, not actual data
zipStream.PutNextEntry(newEntry);
// Copy date to zip RECORD
StreamUtils.Copy(fileMemoryStream, zipStream, new byte[4096]);
// Mark this RECORD closed in the zip
zipStream.CloseEntry();
}
}
// Close the zip stream, parent stays open due to !IsStreamOwner
zipStream.Close();
outputMemStream.Seek(0, SeekOrigin.Begin);
return outputMemStream;
}
编辑-您应该删除:
// Reset position of stream
fileMemoryStream.Position = 0;
很确定这就是问题所在。所以我更新了代码,但当我从控制器下载时,它仍然会给我一个错误,即代码无效。ie:压缩(压缩)文件夹“…”无效。@jimfromthegym JimMackin它有大小吗?还是0字节?@jimfromthegym JimMackin实际上不会重置流的位置。请参阅更新的代码。我将位置重置为0,但它仍然不起作用。让我们继续。