Getting error file corrupt error when downloading large files using Ionic.zip in c#. When user extracts that file file corrupt is being shown. When i am doing same with smaller no of files than it is working fine. Even it is not giving any error while creating zip files. I am creating zip file of existing pdf files which are added in one zip files. There may be 5 files or may 1000 files of minimum 10 MB each.
I have tried with threshold and all other options provided on google, but didn't find any solutions.
using (ZipFile zip = new ZipFile())
{
zip.AlternateEncodingUsage = ZipOption.AsNecessary;
zip.CompressionLevel = Ionic.Zlib.CompressionLevel.Level9;
//zip.AddDirectoryByName("Files");
for (int i = 0; i < dt.Rows.Count; i++)
{
filePath = Convert.ToString(dt.Rows[i]["filePath"]);
fileIds.Add(Convert.ToInt32(dt.Rows[i]["fileid"]));
string fileFullName = Convert.ToString(dt.Rows[i]["fileName"]);
string fName = Convert.ToString(dt.Rows[i]["fileName"]).Split('_')[1];
//ExceptionLogging c1 = new ExceptionLogging("filePath = " + filePath + " fileFullName = " + fileFullName +
// " fName = " + fName);
//c1.ErrorLog(HttpContext.Current.ApplicationInstance.Server.MapPath("~/Logs/"));
if (!fileNamesList.Contains(fileFullName.Split('_')[0]))
{
//ExceptionLogging c2 = new ExceptionLogging("In if condition -- filePath = " + filePath);
//c2.ErrorLog(HttpContext.Current.ApplicationInstance.Server.MapPath("~/Logs/"));
zip.AddFile(filePath, "Files");
fileNamesList.Add(fileFullName.Split('_')[0]);
}
else
{
filePath = filePath.Substring(0, filePath.Length - 4) + "_" + fName;
//filePath = filePath.Split('.')[0] + "_" + fName;
zip.AddFile(filePath, "Files");
fileNamesList.Add(fileFullName);
//ExceptionLogging c3 = new ExceptionLogging("In else condition -- filePath = " + filePath + " fileFullName = " + fileFullName);
//c3.ErrorLog(HttpContext.Current.ApplicationInstance.Server.MapPath("~/Logs/"));
}
//zip.AddFile(filePath, "Files");
}
Response.Clear();
Response.BufferOutput = false;
string zipName = String.Format("ZipFile-{0}.zip", DateTime.Now.ToString("yyyy-MMM-dd-HHmmss"));
Response.ContentType = "application/zip";
Response.AddHeader("content-disposition", "attachment; filename=" + zipName);
zip.Save(Response.OutputStream);
//Response.End();
HttpContext.Current.ApplicationInstance.CompleteRequest();
}
I should be able to download large files inside zip.
My explanation needs more space than a comment:
On x32 platforms the usable ram limit for
.Net
is holding the program to compress files in larger sizes. Try switching to x64 temporarily and that might fix your problem.I also suggest research about LOH (Large Object Heap) which knowing it will come in handy for you in future dealing with these kind of scenarios:
An article about LOH