我正在尝试创建一个将流式传输给用户的DotNetZip zip文件。在zip文件中,我插入了两个内存流。但由于某种原因,当我打开zip文件时,它是空的。我查看了文档,发现几乎没有任何帮助。我的代码:
public async Task<FileResult> DownloadFile(string fileName){
//Create image memory stream
System.Drawing.Image image = System.Drawing.Image.FromFile(Server.MapPath("~/Images/" + fileName));
MemoryStream msImage = new MemoryStream();
image.Save(msImage, image.RawFormat);
//Create Word document using DocX
MemoryStream msDoc = new MemoryStream();
DocX doc = DocX.Create(msDoc);
Paragraph p1 = doc.InsertParagraph();
p1.AppendLine("Text information...");
Paragraph p2 = doc.InsertParagraph();
p2.AppendLine("DISCLAIMER: ...");
doc.SaveAs(msDoc);
//Create Zip File and stream it to the user
MemoryStream msZip = new MemoryStream();
ZipFile zip = new ZipFile();
msImage.Seek(0, SeekOrigin.Begin);
msDoc.Seek(0, SeekOrigin.Begin);
ZipEntry imageEntry = zip.AddEntry("MyImageName.jpg", msImage);
ZipEntry docEntry = zip.AddEntry("MyWordDocName.docx", msDoc);
zip.Save(msZip);
image.Dispose();
doc.Dispose();
zip.Dispose();
return File(msZip, System.Net.Mime.MediaTypeNames.Application.Octet, "MyZipFileName.zip");
}
我已经检查了msImage和msDoc的大小,并且它们都加载了数据,但msZip在大小方面显示的很少。更不用说在下载时,它是一个空的zip文件。我需要知道为什么没有添加这些流。万分感谢!
答案 0 :(得分:6)
好的......我自己找到了答案......
事实证明,不仅
ZipEntry imageEntry = zip.AddEntry("MyImageName.jpg", msImage);
ZipEntry docEntry = zip.AddEntry("MyWordDocName.docx", msDoc);
要求将msImage和msDoc设置回0位置,
return File(msZip, System.Net.Mime.MediaTypeNames.Application.Octet, "MyZipFileName.zip");
还要求将msZip设置为0位置。所以加入
msZip.Seek(0, SeekOrigin.Begin);
在调用返回文件之前,一切正常。