StreamReader is null

Question

フォームを使用して、ファイルとオプションフィールドをコントロールに投稿します。 HttpPostedFileBaseファイルを3つのメソッドに渡しています。それらのうちの2つでは、それはヌルではなく、最後のものである。私はそれをどこにでも置いてはいけません。 これは、コード...

マイフォーム

<form onsubmit="return check();" action="" method="post" enctype="multipart/form-data" class="form-inline"> 
    <div class="form-group"> 
     <label for="languages">Choose the language combination for translating the E BOOK </label> 
     <select class=" input-large" name="languages" id="languages"> 

      <option value="en-fr">ENGLISH TO FRENCH</option> 
      <option value="en-de">ENGLISH TO GERMAN</option> 
      <option value="en-pt">ENGLISH TO PORTUGUESE</option> 
      <option value="en-ru">ENGLISH TO RUSSIAN</option> 
      <option value="en-sr">ENGLISH TO SERBIAN</option> 
      <option value="en-es">ENGLISH TO SPANISH</option> 
      <option value="fr-en">FRENCH TO ENGLISH</option> 
      <option value="de-en">GERMAN TO ENGLISH</option> 
      <option value="de-sr">GERMAN TO SERBIAN</option> 
      <option value="pt-en">PORTUGUESE TO ENGLISH</option> 
      <option value="ru-en">RUSSIAN TO ENGLISH</option> 
      <option value="es-en">SPANISH TO ENGLISH</option> 
     </select> 
    </div> 


    <div class="form-inline"> 
     <input type="file" class="btn btn-success" name="file" id="file" accept="text/plain, application/pdf"> 
     <input type="submit" class="btn btn-success" value="Upload PDF/TXT document" name="submit"> 
    </div> 
</form> 

これは、フォーム

を扱うのcontrolerの一部であり、これは私の全体のcontrolerクラスです

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using System.Net.Mail; 
using System.Web; 
using System.Web.Mvc; 
using System.Data; 

namespace TranslationEmbedder.Controllers 
{ 
    public class HomeController : Controller 
    { 
     public ActionResult Index() 
     { 
      return View(); 
     } 

     [HttpPost] 
     public ActionResult Index(HttpPostedFileBase file, string languages) 
     { 

      if (file != null) 
      { 
       if (file.ContentLength > 0) 
       { 
        //var fileName = Path.GetFileName(file.FileName); 
        var fileNameNoExtension = Path.GetFileNameWithoutExtension(file.FileName); 
        //var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName); 
        //file.SaveAs(path); 
        HashSet<string> set=null; 
        var fileExtension = Path.GetExtension(file.FileName); 

        if (fileExtension.ToLower().Equals(".txt")) 
        { 
         set = HomeController.geUniqueWordsInEbook(file); 
        } 

        if (fileExtension.ToLower().Equals(".pdf")) 
        { 
         set = HomeController.geUniqueWordsInEbookPdf(file); 
        } 

        if (set == null) 
        { 
         return RedirectToAction("Index"); 
        } 

        Dictionary<string, string> dic = HomeController.LoadCsvDictionary(set, languages); 

        if (fileExtension.ToLower().Equals(".txt")) 
        { 
         Response.Clear(); 
         Response.AddHeader("Content-Disposition", "attachment; filename=" + fileNameNoExtension + ".html"); 
         Response.ContentType = "text/html"; 
         HomeController.writeHtmlEbookFromTxt(file, dic, languages); 
         Response.End(); 
        } 

        if (fileExtension.ToLower().Equals(".pdf")) 
        { 
         Response.Clear(); 
         Response.AddHeader("Content-Disposition", "attachment; filename=" + fileNameNoExtension + ".html"); 
         Response.ContentType = "text/html"; 
         writeHtmlEbookFromPdf(file, dic, languages); 
         Response.End(); 
        } 


        // Not sure what else to do here 
        return Content(String.Empty); 



       } 
      } 

      return RedirectToAction("Index"); 
     } 

     private void writeHtmlEbookFromPdf(HttpPostedFileBase file, Dictionary<string, string> dic,string languageCode) 
     { 


     } 

     private static void writeHtmlEbookFromTxt(HttpPostedFileBase file, Dictionary<string, string> dic, string languageCode) 
     { 


       var fileNameNoExtension = Path.GetFileNameWithoutExtension(file.FileName); 

        System.Web.HttpContext.Current.Response.Write(""); 
        System.Web.HttpContext.Current.Response.Write("<!DOCTYPE html><html>"); 
        System.Web.HttpContext.Current.Response.Write("<head><META HTTP-EQUIV='content-type' CONTENT='text/html; charset=utf-8'><title>" + fileNameNoExtension + "</title>"); 
        System.Web.HttpContext.Current.Response.Write("<script>"); 
        System.Web.HttpContext.Current.Response.Write("function speakIt(b)"); 
        System.Web.HttpContext.Current.Response.Write("{"); 
        System.Web.HttpContext.Current.Response.Write("if (document.getElementById(\"myCheck\").checked) {"); 
        System.Web.HttpContext.Current.Response.Write("if ('speechSynthesis' in window) {"); 
        System.Web.HttpContext.Current.Response.Write("var sometext=b;"); 
        System.Web.HttpContext.Current.Response.Write("var msg = new SpeechSynthesisUtterance();"); 
        System.Web.HttpContext.Current.Response.Write("var voices = window.speechSynthesis.getVoices();"); 
        System.Web.HttpContext.Current.Response.Write("msg.text = sometext;"); 


        string[] toSpeak = languageCode.Split('-'); 

        switch (toSpeak[0]) 
        { 
         case "de"://German 
          languageCode = "de-DE"; 
          break; 
         case "en"://English 
          languageCode = "en-GB"; 
          break; 
         case "es"://Spanish 
          languageCode = "es-ES"; 
          break; 
         case "fr"://French 
          languageCode = "fr-FR"; 
          break; 
         case "ru"://Russian 
          languageCode = "ru"; 
          break; 
         case "pt"://Portuguese - Portugal 
          languageCode = "pt-PT"; 
          break; 
         case "sr"://Serbian 
          languageCode = "sr-SP"; 
          break; 
         case "ja"://Japanese 
          languageCode = "ja"; 
          break; 
         case "he"://Hebrew 
          languageCode = "he"; 
          break; 
         case "it"://Italian - Italy 
          languageCode = "it-IT"; 
          break; 
         case "el"://Greek 
          languageCode = "el"; 
          break; 
         case "zh"://Chinese - China 
          languageCode = "zh-CN"; 
          break; 
         case "ar"://Arabic - Egypt 
          languageCode = "ar-EG"; 
          break; 
         case "hy"://Armenian 
          languageCode = "hy"; 
          break; 
         case "eu"://Basque 
          languageCode = "eu"; 
          break; 
         case "be"://Belarusian 
          languageCode = "be"; 
          break; 
         case "cs"://Czech 
          languageCode = "cs"; 
          break; 
         case "da"://Danish 
          languageCode = "da"; 
          break; 
         case "et"://Estonian 
          languageCode = "et"; 
          break; 
         case "mk"://FYRO Macedonia 
          languageCode = "mk"; 
          break; 
         case "hu"://Hungarian 
          languageCode = "hu"; 
          break; 
         case "is"://Icelandic 
          languageCode = "is"; 
          break; 
         case "hi"://Hindi 
          languageCode = "hi"; 
          break; 
         case "id"://Indonesian 
          languageCode = "id"; 
          break; 
         case "kk"://Kazakh 
          languageCode = "kk"; 
          break; 
         case "ko"://Korean 
          languageCode = "ko"; 
          break; 
         case "lv"://Latvian 
          languageCode = "lv"; 
          break; 
         case "lt"://Lithuanian 
          languageCode = "lt"; 
          break; 
         case "pl"://Polish 
          languageCode = "pl"; 
          break; 
         case "sk"://Slovak 
          languageCode = "sk"; 
          break; 
         case "sl"://Slovenian 
          languageCode = "sl"; 
          break; 
         case "sv"://Swedish - Sweden 
          languageCode = "sv-SE"; 
          break; 
         case "tr"://Turkish 
          languageCode = "tr"; 
          break; 
         case "uk"://Ukrainian 
          languageCode = "uk"; 
          break; 
         case "vi"://Vietnamese 
          languageCode = "vi"; 
          break; 
         //...add more language support 
         default: 
          languageCode = "de-DE"; 
          break; 
        } 

        System.Web.HttpContext.Current.Response.Write("msg.lang = '" + languageCode + "';"); 
        System.Web.HttpContext.Current.Response.Write("speechSynthesis.speak(msg);"); 
        System.Web.HttpContext.Current.Response.Write("}"); 
        System.Web.HttpContext.Current.Response.Write("}"); 
        System.Web.HttpContext.Current.Response.Write("}"); 

        System.Web.HttpContext.Current.Response.Write("</script>"); 

        System.Web.HttpContext.Current.Response.Write("<style>"); 

        System.Web.HttpContext.Current.Response.Write("#ebook {"); 
        System.Web.HttpContext.Current.Response.Write(" margin: auto;"); 
        System.Web.HttpContext.Current.Response.Write("width: 90%;font-size: 200%;@page {counter-increment: page;counter-reset: page 1;@top-right {content: \"Page \" counter(page) \" of \" counter(pages);}}"); 
        System.Web.HttpContext.Current.Response.Write("text-align: left;line-height:1.5;font-family: 'Merriweather', Georgia, 'Times New Roman', Times, serif;"); 
        System.Web.HttpContext.Current.Response.Write("vertical-align: middle;"); 
        System.Web.HttpContext.Current.Response.Write("word-wrap: break-word;"); 
        System.Web.HttpContext.Current.Response.Write("border:3px solid #8AC007;"); 
        System.Web.HttpContext.Current.Response.Write("padding: 10px;"); 
        System.Web.HttpContext.Current.Response.Write("}"); 

        System.Web.HttpContext.Current.Response.Write("#header-wrap {"); 
        System.Web.HttpContext.Current.Response.Write("position: fixed;"); 
        System.Web.HttpContext.Current.Response.Write("text-align: center;"); 
        System.Web.HttpContext.Current.Response.Write("background-color: #8AC007;"); 
        System.Web.HttpContext.Current.Response.Write("color: white;"); 
        System.Web.HttpContext.Current.Response.Write("height: 25px;"); 
        System.Web.HttpContext.Current.Response.Write("top: 0;"); 
        System.Web.HttpContext.Current.Response.Write("width: 100%;"); 
        System.Web.HttpContext.Current.Response.Write("z-index: 100;"); 
        System.Web.HttpContext.Current.Response.Write("}"); 

        System.Web.HttpContext.Current.Response.Write("</style>"); 
        System.Web.HttpContext.Current.Response.Write("</head><body></br>"); 

        System.Web.HttpContext.Current.Response.Write("<div id='header-wrap'></br>"); 
        System.Web.HttpContext.Current.Response.Write("<span>ENABLE/DISABLE TEXT TO SPEECH : <input type=\"checkbox\" name=\"myCheck\" id=\"myCheck\" checked=\"checked\"></span></br></br>"); 
        System.Web.HttpContext.Current.Response.Write("</div>"); 

        System.Web.HttpContext.Current.Response.Write("<div id='ebook'>"); 




      System.IO.StreamReader reader = new System.IO.StreamReader(file.InputStream); 
      string line=""; 
      while ((line = reader.ReadLine()) != null) 
       { 


         string[] words = line.Split(' '); 

         foreach (string word in words) 
         { 
          string cleanWord = word.Replace(".", "").Replace(",", "").Replace(":", "").Replace(";", "").Replace("ß", "ss").Replace("?", "").Replace("!", "").Replace("«", "").Replace("»", "").Replace("[", " ").Replace("]", " ").Replace("(", " ").Replace(")", " ").Replace(",,", " ").Replace("\"", " ").Replace("-", " ").ToLower(); 
          string value = ""; 
          if (dic.ContainsKey(cleanWord)) 
           value = dic[cleanWord]; 

          System.Web.HttpContext.Current.Response.Write("<span onclick =\"alert('" + value + "');speakIt('" + cleanWord + "'); \" >" + " " + word + " " + "</span>"); 
         } 

         System.Web.HttpContext.Current.Response.Write("</br>"); 


        } 
        System.Web.HttpContext.Current.Response.Write("</div></body></html>"); 


       reader.Close(); 




     } 
     private static Dictionary<string, string> LoadCsvDictionary(HashSet<string> uniqueEbookWords,string language) 
     { 

      string languageFile = AppDomain.CurrentDomain.GetData("DataDirectory")+ "\\languages\\"+ language + ".csv"; 
      Dictionary<string, string> d = new Dictionary<string, string>(); 



      using (var reader = new StreamReader(System.IO.File.OpenRead(@languageFile))) 
      { 

       while (!reader.EndOfStream) 
       { 
        var line = reader.ReadLine(); 
        var values = line.Split(','); 

        if (uniqueEbookWords.Contains(values[0].ToLower())) 
        { 
         if (!d.ContainsKey(values[0].ToLower())) 
          d.Add(values[0].ToLower(), values[1].ToLower()); 
        } 

       } 


      } 


      return d; 
     } 

     private static HashSet<string> geUniqueWordsInEbook(HttpPostedFileBase file) 
     { 
      //make two options one for PDF and one for TXT uploaded ebook... 
      int counter = 0; 
      string line; 

      HashSet<string> uniqueWords = new HashSet<string>(); 

      System.IO.StreamReader file1 =new System.IO.StreamReader(file.InputStream); 


      while ((line = file1.ReadLine()) != null) 
      { 
       string[] words = line.Split(' '); 
       foreach (string word in words) 
       { 
        string cleanWord = word.Replace(".", "").Replace(",", "").Replace(":", "").Replace(";", "").Replace("ß", "ss").Replace("?", "").Replace("!", "").Replace("«", "").Replace("»", "").Replace("[", " ").Replace("]", " ").Replace("(", " ").Replace(")", " ").Replace(",,", " ").Replace("\"", " ").Replace("-", " ").ToLower(); 
        uniqueWords.Add(cleanWord); 

       } 

       counter++; 
      } 

      file1.Close(); 


      return uniqueWords; 
     } 

     private static HashSet<string> geUniqueWordsInEbookPdf(HttpPostedFileBase file) 
     { 
      //make two options one for PDF and one for TXT uploaded ebook... 
      int counter = 0; 
      string line; 

      HashSet<string> uniqueWords = new HashSet<string>(); 

      System.IO.StreamReader file1 = new System.IO.StreamReader(file.InputStream); 


      while ((line = file1.ReadLine()) != null) 
      { 
       string[] words = line.Split(' '); 
       foreach (string word in words) 
       { 
        string cleanWord = word.Replace(".", "").Replace(",", "").Replace(":", "").Replace(";", "").Replace("ß", "ss").Replace("?", "").Replace("!", "").Replace("«", "").Replace("»", "").Replace("[", " ").Replace("]", " ").Replace("(", " ").Replace(")", " ").Replace(",,", " ").Replace("\"", " ").Replace("-", " ").ToLower(); 
        uniqueWords.Add(cleanWord); 

       } 

       counter++; 
      } 

      file1.Close(); 


      return uniqueWords; 
     } 



     public ActionResult About() 
     { 
      ViewBag.Message = "Watch a video that will you more about www.TRANSLATION-EMBEDDER.com project."; 

      return View(); 
     } 

     public ActionResult Contact() 
     { 
      ViewBag.Message = "Feel free to contact us"; 

      return View(); 
     } 

     [HttpPost] 
     public ActionResult Contact(string email,string message) 
     { 

      if (email.Equals("")) 
      { 
       ViewBag.Message = "You must provide an email"; 
       return View(); 
      } 

      if (message.Equals("")) 
      { 
       ViewBag.Message = "You must provide the message"; 
       return View(); 
      } 

      ViewBag.Message = "The message is sent to us from the user with email: "+ email + ".We will responde as soon as possible. Have a nice day. "; 
      sendEmail(email, message); 
      return View(); 
     } 

     private void sendEmail(string email, string message) 
     { 
      //http://stackoverflow.com/questions/18326738/how-to-send-email-in-asp-net-c-sharp 

      /* 
      SmtpClient smtpClient = new SmtpClient("smtp.gmail.com", 25); 

      smtpClient.Credentials = new System.Net.NetworkCredential("jvkrneta@gmail.com", "tijanica"); 
      smtpClient.UseDefaultCredentials = true; 
      smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network; 
      smtpClient.EnableSsl = true; 
      MailMessage mail = new MailMessage(); 

      //Setting From , To and CC 
      mail.From = new MailAddress(email, "Translation-Embedder.com"); 
      mail.To.Add(new MailAddress("jvkrneta@gmail.com")); 
      mail.Body = message; 

      smtpClient.Send(mail); 
      */ 
     } 





    } 
} 

されており、方法でのみ

private static void writeHtmlEbookFromTxt(HttpPostedFileBase file, Dictionary<string, string> dic, string languageCode) 

私は読者のためにnullを取得し、ファイルをループするための私のループは この部分を実行したことがないん

System.IO.StreamReader reader = new System.IO.StreamReader(file.InputStream); 
      string line=""; 
      while ((line = reader.ReadLine()) != null) 
       { 


         string[] words = line.Split(' '); 

         foreach (string word in words) 
         { 
          string cleanWord = word.Replace(".", "").Replace(",", "").Replace(":", "").Replace(";", "").Replace("ß", "ss").Replace("?", "").Replace("!", "").Replace("«", "").Replace("»", "").Replace("[", " ").Replace("]", " ").Replace("(", " ").Replace(")", " ").Replace(",,", " ").Replace("\"", " ").Replace("-", " ").ToLower(); 
          string value = ""; 
          if (dic.ContainsKey(cleanWord)) 
           value = dic[cleanWord]; 

          System.Web.HttpContext.Current.Response.Write("<span onclick =\"alert('" + value + "');speakIt('" + cleanWord + "'); \" >" + " " + word + " " + "</span>"); 
         } 

         System.Web.HttpContext.Current.Response.Write("</br>"); 


        } 
        System.Web.HttpContext.Current.Response.Write("</div></body></html>"); 


       reader.Close(); 

私はすべてのものを試してみましたが、私は唯一の多くの方法で使用する理由同じコードを見ることができませんでしたこの場合、リーダーOBJECTにはnullが返されます。

Answer 1

ファイルストリームを2回読み取ることはできません。あなたのgeUniqueWordsInEbookメソッドの中ではすでにfile.InputStreamを読んでいて、最後にそれを閉じてしまっています。これは、writeHtmlEbookFromTxtメソッドで2度目に読むことができない理由です。ファイルの内容を読みながら、1回の操作で2つの操作を行う必要があります。したがって、基本的にコードを再編成して、2つの操作がファイルストリームを読みながら1か所で行われるようにする必要があります。

アップロードされたファイルが非常に大きいと思わない場合は、その内容をメモリに（byte[]）ロードすることができます。しかし、これは大容量のファイルに対する過度の攻撃となるでしょう。

アップロードしたファイルをウェブサーバーのディスクに保存し、このアップロードしたファイルから複数回読み取ることもできます。

Answer 2

私はそれがあなたに役立つことを願っています。

のcontroler：

[HttpPost] 
    public ActionResult Create(HttpPostedFileBase FileData) 
    { 
     string fpath = ""; 
     try 
     { 
      if (Request.Files.Count > 0) 
      { 
       try 
       { 

        HttpPostedFileBase file = FileData; 
        string fname; 
        // want to check extension then use this method 
        //if (CheckExtension(file.ContentType.ToLower())) 
        //{ 
         // Checking for Internet Explorer 
         string extension = System.IO.Path.GetExtension(file.FileName); 

         if (Request.Browser.Browser.ToUpper() == "IE" || Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER") 
         { 
          string[] testfiles = file.FileName.Split(new char[] { '\\' }); 
          fname = Guid.NewGuid() + extension; //+ testfiles[testfiles.Length - 1]; 
         } 
         else 
         { 
          fname = Guid.NewGuid() + extension; //+ file.FileName; 
         } 

         // Get the complete folder path and store the file inside it. 
         fname = System.IO.Path.Combine(Server.MapPath("~/Content/"), fname); 
         file.SaveAs(fname); 

         return Content("Successfully Uploaded"); 
        //} 

       } 
       catch (Exception ex) 
       { 
        return Content("Error occurred. Error details: " + ex.Message); 
       } 
      } 

     } 
     catch (Exception) 
     { 
      return Content(Response.StatusCode.ToString() + " Bad Requrest error." + fpath); 
     } 
     return Content("No files selected."); 
    } 

    public bool CheckExtension(string Ext) 
    { 
     if (Ext == "application/pdf") 
     { 
      return true; 
     } 
     else if (Ext == "text/plain") 
     { 
      return true; 
     } 
     else if (Ext == "application/msword") 
     { 
      return true; 
     } 
     else if (Ext == "application/vnd.openxmlformats-officedocument.wordprocessingml.document") 
     { 
      return true; 
     } 
     else 
     { 
      return false; 
     } 
    } 

ビュー：

@using (Html.BeginForm("Create", "Home", null, FormMethod.Post, new { id = "formU", enctype = "multipart/form-data" })){ 

<div class="modal-body"> 
    <div class="form-horizontal"> 
     @Html.ValidationSummary(true) 

     <label for="file">Filename:</label> 
     <input type="file" name="File" id="File" style="width:240px" /> 

     <div class="form-group"> 
      <input id="submit" type="submit" value="Submit" class="btn btn-success" /> 
     </div> 
    </div> 
</div>} 

あなたはまた、私は何か他のものがここにnullであることを疑うclick here