public static string CheckValidZipFile(HttpPostedFileBase file)
{
if (!FileTypeDetector.IsZipFile(file))
{
return("Input file is not .zip file");
}
file.InputStream.Position = 0;
if (!CheckImageZipFile(file))
{
return("Zip file is empty or contains invalid image file");
}
file.InputStream.Position = 0;
return(null);
}
private static bool CheckImageZipFile(HttpPostedFileBase file)
{
//true: leaveOpen after read, so that file stream will not be disposed
using (ZipArchive archive = new ZipArchive(file.InputStream, ZipArchiveMode.Read, true))
{
if (archive.Entries.Count == 0)
{
return(false);
}
foreach (var entry in archive.Entries)
{
if (!FileTypeDetector.IsImageFile(entry.Open()))
{
return(false);
}
}
}
return(true);
}
public static string CheckValidExcelFile(HttpPostedFileBase file)
{
if (!FileTypeDetector.IsExcelFile(file))
{
return("Input file is not vaild excel file");
}
file.InputStream.Position = 0;
if (!CheckExcelFileHeader(file))
{
return("Excel file is missing some column");
}
file.InputStream.Position = 0;
if (GetNumberOfRecord(file) == 0)
{
return("Excel does not contains any record");
}
file.InputStream.Position = 0;
return(null);
}
