[英]DotNetZip fails with “stream does not support seek operations”
我在C#中使用DotNetZip從流中解壓縮,如下所示:
public static void unzipFromStream(Stream stream, string outdir)
{ //omit try catch block
using (ZipFile zip = ZipFile.Read(stream)){
foreach (ZipEntry e in zip){
e.Extract(outdir, ExtractExistingFileAction.OverwriteSilently);
}
}
}
流是使用獲得的
WebClient client = new WebClient();
Stream fs = client.OpenRead(url);
但是,我遇到了以下異常
exception during extracting zip from stream System.NotSupportedException: This stream does not support seek operations.
at System.Net.ConnectStream.get_Position()
at Ionic.Zip.ZipFile.Read(Stream zipStream, TextWriter statusMessageWriter, Encoding encoding, EventHandler`1 readProgress)
在服務器端(ASP.NET MVC 4),返回FilePathResult
或FileStreamResult
均導致此異常。
我應該在客戶端以不同的方式獲取流嗎? 或者如何使服務器返回“可搜索”流? 謝謝!
您必須將數據下載到文件或內存中,然后創建FileStream
或MemoryStream
或其他支持查找的流類型。 例如:
WebClient client = new WebClient();
client.DownloadFile(url, filename);
using (var fs = File.OpenRead(filename))
{
unzipFromStream(fs, outdir);
}
File.Delete(filename);
或者,如果數據適合內存:
byte[] data = client.DownloadData(url);
using (var fs = new MemoryStream(data))
{
unzipFromStream(fs, outdir);
}
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