StreamReader为空

Question

我使用一个表单来发布一个文件，并使用一个选项字段给控件。我将HttpPostedFileBase文件传递给3种方法。在其中两种情况下，它不是空的，但在最后一种中，它是空的。我不会在任何地方给它赋值。这是密码..。

我的表格

<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>

这是控制器中处理表单的部分。

这是我的整个控制课

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);
            */
        }





    }
}   

而且只在方法上

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

对于读取器，我是否获得null，而循环文件的循环是否从未运行此部分：

 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();

我尝试了所有这些方法，但是没有看到为什么我在许多方法中使用的相同代码只在本例中为reader对象提供null。

Answer 1

您不能读取文件流两次。在您的geUniqueWordsInEbook方法中，您已经读取了file.InputStream，甚至在结束时关闭了它。这就是为什么不能在writeHtmlEbookFromTxt方法中第二次阅读它的原因。在读取文件内容时，需要在一次传递中执行这2项操作。因此，基本上，您必须重新组织您的代码，以便在读取文件流时，这两个操作在一个地方进行。

如果您不期望上传的文件非常大，您可以将它们的内容加载到内存中(在byte[]中)，您可以通过方法传递这些内容。但对于大型文件来说，这将是一个过度的打击。

另一种选择是将上传的文件保存到您的then服务器上的磁盘上，然后从这个上传的文件中读取多次。

Answer 2

我希望这对你会有帮助。

控制者：

[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;
        }
    }

查看：

@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>}

还可以从git集线器存储库单击此处下载源代码。