Question

I’m trying to serve a txt file made from the database using an action. The action is the following:

public ActionResult ATxt()
{
    var articulos = _articulosService.ObteTotsArticles();
    return File(CatalegATxt.ATxt(articulos), "text/plain");
}

and the CatalegATxt class is:

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using WebDibaelsaMVC.DTOs.Busqueda;

namespace WebDibaelsaMVC.TxtLib
{
    public static class CatalegATxt
    {
         public static Stream ATxt(IEnumerable<ArticuloBusquedaDTO> articles)
         {
            var stream = new MemoryStream();
            var streamWriter = new StreamWriter(stream, Encoding.UTF8);
            foreach (ArticuloBusquedaDTO article in articles)
            {
                streamWriter.WriteLine(article.ToStringFix());
            }
            stream.Seek(0, SeekOrigin.Begin);
            return stream;
        }

        public static string ToStringFix(this ArticuloBusquedaDTO article)
        {
            string result = "";
            result += article.CodigoArticulo.PadRight(10, ' ').Substring(0, 10);
            result += article.EAN.Trim().PadLeft(13, '0').Substring(0, 13);
            result += article.NombreArticulo.PadRight(100, ' ').Substring(0, 100);
            result += article.Marca.PadRight(100, ' ').Substring(0, 100);
            result += article.Familia.PadRight(50, ' ').Substring(0, 50);
            result += article.PrecioCesion.ToStringFix();
            result += article.PVP.ToStringFix();
            return result;
        }

        private static string ToStringFix(this double numero)
        {
            var num = (int)Math.Round(numero * 100, 0);
            string result = num.ToString().PadLeft(10, '0');
            return result;
        }
    }
}

it just writes the file lines based on the stuff I got from the database. But when I look at the file it looks truncated. The file is about 8Mb. I also tried converting to byte[] before returning from ATxt with the same result.

Any idea?

Thanks,

Carles

Update: I also tried to serve XML from the same content and it also gets truncated. It doesn’t get truncated on the data (I thought it might have been an EOF character in it) but it truncates in the middle of a label…

Answer 1

I was having the exact same problem. The text file would always be returned as truncated.

It crossed my mind that it might be a “flushing” problem, and indeed it was. The writer’s buffer hasn’t been flushed at the end of the operation – since there’s no using block, or the Close() call – which would flush automatically.

You need to call:

streamWriter.Flush();

before MVC takes over the stream.

Here’s how your method should look like:

 public static Stream ATxt(IEnumerable<ArticuloBusquedaDTO> articles)
 {
    var stream = new MemoryStream();
    var streamWriter = new StreamWriter(stream, Encoding.UTF8);
    foreach (ArticuloBusquedaDTO article in articles)
    {
        streamWriter.WriteLine(article.ToStringFix());
    }
    // Flush the stream writer buffer
    streamWriter.Flush();
    stream.Seek(0, SeekOrigin.Begin);
    return stream;
}