Fileinfo.Length gives wrong size

Question

I’m trying to add the thumbnail, the name and size of a file to a ListView. I can add everything correctly except the size!

I’m making Split PDF and I will add the information of each page to the ListView.

The values that appear in the "Size" are 0 or wrong value, which I think is the file name size, not the file size itself.

I will show my code and the differences between giving the value 0 or wrong value.

VALUE 0:

iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(input);
iTextSharp.text.pdf.PdfReader.unethicalreading = true;
string name = Path.GetFileNameWithoutExtension(input);
for (int i = 1; i <= reader.NumberOfPages; i++)
{
    //get thumbnail from 1st page-----------------------------------------------------
    string pastapdf = AppDomain.CurrentDomain.BaseDirectory + "temporario\\Thumbnails";
    Directory.CreateDirectory(pastapdf);
    using (var document = PdfiumViewer.PdfDocument.Load(input))
    {
        var image = document.Render(i-1, 60, 84, 300, 300, true);
        image.Save(pastapdf + "\\" + name + "Pagina" + i + "_thumbnail" + ".jpg", ImageFormat.Jpeg);
        thumbnails.Images.Add(j.ToString(), image);
        image.Dispose();
        document.Dispose();
    }
    //split pdf-----------------------------------------------------------------------
    string p = AppDomain.CurrentDomain.BaseDirectory + "temporario\\" + name + " - Pagina " + i + ".PDF";
    Stream outputStream = new FileStream(p, FileMode.Create);

    Document doc = new Document();
    PdfWriter pdfWriter = PdfWriter.GetInstance(doc, outputStream);
    doc.Open();
    PdfContentByte pdfContentByte = pdfWriter.DirectContent;
    PdfImportedPage importedpage = pdfWriter.GetImportedPage(reader, i);
    iTextSharp.text.Rectangle mediabox = reader.GetPageSize(i);

    doc.SetPageSize(mediabox);
    doc.NewPage();
    pdfContentByte.AddTemplate(importedpage, 0, 0);

    FileInfo f = new FileInfo(p);
    ListViewItem _item1 = new ListViewItem();
    _item1.ImageKey = j.ToString();
    _item1.Text = name + " - Pagina " + i + ".PDF";
    _item1.SubItems.Add(f.Length.ToString()); //diferença está aui

    lista2.Items.Add(_item1);

    outputStream.Flush();
    doc.Close();
    doc.Dispose();
    outputStream.Close();
    pdfWriter.Dispose();
    j++;

WRONG VALUE:

iTextSharp.text.pdf.PdfReader reader = new iTextSharp.text.pdf.PdfReader(input);
iTextSharp.text.pdf.PdfReader.unethicalreading = true;
string name = Path.GetFileNameWithoutExtension(input);
for (int i = 1; i <= reader.NumberOfPages; i++)
{
    //get thumbnail from 1st page-----------------------------------------------------
    string pastapdf = AppDomain.CurrentDomain.BaseDirectory + "temporario\\Thumbnails";
    Directory.CreateDirectory(pastapdf);
    using (var document = PdfiumViewer.PdfDocument.Load(input))
    {
        var image = document.Render(i-1, 60, 84, 300, 300, true);
        image.Save(pastapdf + "\\" + name + "Pagina" + i + "_thumbnail" + ".jpg", ImageFormat.Jpeg);
        thumbnails.Images.Add(j.ToString(), image);
        image.Dispose();
        document.Dispose();
    }
    //split pdf-----------------------------------------------------------------------
    string p = AppDomain.CurrentDomain.BaseDirectory + "temporario\\" + name + " - Pagina " + i + ".PDF";
    Stream outputStream = new FileStream(p, FileMode.Create);

    Document doc = new Document();
    PdfWriter pdfWriter = PdfWriter.GetInstance(doc, outputStream);
    doc.Open();
    PdfContentByte pdfContentByte = pdfWriter.DirectContent;
    PdfImportedPage importedpage = pdfWriter.GetImportedPage(reader, i);
    iTextSharp.text.Rectangle mediabox = reader.GetPageSize(i);

    doc.SetPageSize(mediabox);
    doc.NewPage();
    pdfContentByte.AddTemplate(importedpage, 0, 0);

    FileInfo f = new FileInfo(p);
    ListViewItem _item1 = new ListViewItem();
    _item1.ImageKey = j.ToString();
    _item1.Text = name + " - Pagina " + i + ".PDF";
    _item1.SubItems.Add(p.Length.ToString()); //diferença está aqui

    lista2.Items.Add(_item1);

    outputStream.Flush();
    doc.Close();
    doc.Dispose();
    outputStream.Close();
    pdfWriter.Dispose();
    j++;

From now on, thank you!

Answer 1

You are measuring the string size and not the file size, the problem is not in the FileInfo.Length but yes in your code.

Now if the FileInfo.Length is returning 0 bytes to you, it is because you still have the stream open and have not persisted their contents on disk.

As you presented in the second block:

string p = AppDomain.CurrentDomain.BaseDirectory + "temporario\\" + name + " - Pagina " + i + ".PDF";
FileInfo f = new FileInfo(p);
ListViewItem _item1 = new ListViewItem();
_item1.ImageKey = j.ToString();
_item1.Text = name + " - Pagina " + i + ".PDF";
_item1.SubItems.Add(p.Length.ToString()); //diferença está aqui

FileInfo.Length will return the file size in bytes since the content has already been written in the files. Close streams and Writes before checking them again.

outputStream.Flush();
doc.Close();
doc.Dispose();
outputStream.Close();
pdfWriter.Dispose();

FileInfo f = new FileInfo(p);
ListViewItem _item1 = new ListViewItem();
_item1.ImageKey = j.ToString();
_item1.Text = name + " - Pagina " + i + ".PDF";
_item1.SubItems.Add(f.Length.ToString()); //a diferença estava aqui