如何在asp net mvc中从c#代码发布文件？

Question

我有一个控制器方法，它以HttpPostedFileBase picture 作为参数。当然，它用于从表单加载图像。但现在我想使用该方法从另一种方法加载文件。我可以使用图像路径在代码中制作 HttpPostedFileBase 文件吗？或者可能是另一种解决方案是首选？

好的，代码：

public ActionResult UploadPicture(HttpPostedFileBase picture)
{
    if (picture.ContentLength > Convert.ToInt32(ConfigurationManager.AppSettings["MaxMBFileSize"]) * 1024 * 1024 || picture.ContentLength == 0)
    {
        return ClientError(ErrorCodes.ClientErrorCodes.FileSizeError, "File size is incorrect");
    }
    else
    {
        string contentType = picture.ContentType;

        if (!PictureHelper.ContentTypeIsValid(contentType))
        {
            return ClientError(ErrorCodes.ClientErrorCodes.MimeTypeError, "Incorrect file type");
        }
        else
        {
            string pictureName = Guid.NewGuid().ToString();
            pictureName += picture.FileName.Substring(picture.FileName.LastIndexOf('.'));

            string serverPath = AppDomain.CurrentDomain.BaseDirectory;
            picture.SaveAs(serverPath + ConfigurationManager.AppSettings["LocalImagesPath"] + pictureName);

            return Success(new { pictureName = pictureName });
        }
    }
}

真的，身体绝对不重要。当然我有类似的东西：

<form method="post" action="Photo\UploadPicture">
    <input type="file">
    <input type="submit" value="submit">
</form>

我想要类似的东西：

public ActionResult NewMethod()
{
    string path = ""; // real path to file here
    var file = OhMyGodMagicTransfer(path);
    // sending request
    request.attach(file);
    request.send;
}

Answer 1

如果文件已经保存到磁盘，那么只返回一个 FilePathResult ：

 public ActionResult FileDownload()
        {
            var fileLocation = "C:\file.jpg"; 
            var fileType = "image/jpeg" //this is the Mime content type;
            return File(fileLocation , fileType ); 
        }

查看 File 的重载，因为您可以返回文件流或字节数组。

Answer 2

   public ActionResult Index()
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(@"C:\proba\MvcApplication3\MvcApplication3\XMLFile1.xml");
            List<Class1> pitanja = new List<Class1>();
            Random rand = new Random();
            int broj1 = rand.Next(1, 3);
            int broj2 = rand.Next(3, 5);
            int broj3 = 5;

            TempData["odg1"] = broj1;
            TempData["odg2"] = broj2;
            TempData["odg3"] = broj3;

            string odg1 = Request.Form["odgg1"];
            string odg2 = Request.Form["odgg2"];
            string odg3 = Request.Form["odgg3"];

            TempData["korisodg1"] = odg1;
            TempData["korisodg2"] = odg2;
            TempData["korisodg3"] = odg3;


            foreach (XmlNode cvor in doc.SelectNodes("/kviz/Pitanje"))
            {

                if (broj1.ToString() == cvor["Rbr"].InnerText)
                {
                    pitanja.Add(
                        new Class1
                        {
                            pitanje = cvor["Pitanje"].InnerText,
                            odg1 = cvor["Odgovor1"].InnerText,
                            odg2 = cvor["Odgovor2"].InnerText,
                            odg3 = cvor["Odgovor3"].InnerText,
                            odg4 = cvor["Odgovor4"].InnerText,
                            resenje = cvor["Resenje"].InnerText
                        }
                        );
                }
                else if (broj2.ToString() == cvor["Rbr"].InnerText)
                {
                    pitanja.Add(
                        new Class1
                        {
                            pitanje = cvor["Pitanje"].InnerText,
                            odg1 = cvor["Odgovor1"].InnerText,
                            odg2 = cvor["Odgovor2"].InnerText,
                            odg3 = cvor["Odgovor3"].InnerText,
                            odg4 = cvor["Odgovor4"].InnerText,
                            resenje = cvor["Resenje"].InnerText
                        }
                        );
                }
                else if (broj3.ToString() == cvor["Rbr"].InnerText)
                {
                    pitanja.Add(
                        new Class1
                        {
                            pitanje = cvor["Pitanje"].InnerText,
                            odg1 = cvor["Odgovor1"].InnerText,
                            odg2 = cvor["Odgovor2"].InnerText,
                            odg3 = cvor["Odgovor3"].InnerText,
                            odg4 = cvor["Odgovor4"].InnerText,
                            resenje = cvor["Resenje"].InnerText
                        }
                        );
                }

            }
            return View(pitanja);

        }

        public ActionResult operater()
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(@"C:\proba\MvcApplication3\MvcApplication3\XMLFile1.xml");
            List<Class1> pitanja = new List<Class1>();

            foreach (XmlNode cvor in doc.SelectNodes("/kviz/Pitanje"))
            {
                if (TempData["odg1"].ToString() == cvor["Rbr"].InnerText)
                    pitanja.Add(new Class1
                    {
                        resenje = cvor["Resenje"].InnerText,
                        pitanje = cvor["Pitanje"].InnerText,
                        odgKorisnika = TempData["korisodg1"].ToString()
                    });

                else if (TempData["odg2"].ToString() == cvor["Rbr"].InnerText)
                    pitanja.Add(new Class1
                    {
                        resenje = cvor["Resenje"].InnerText,
                        pitanje = cvor["Pitanje"].InnerText,
                        odgKorisnika = TempData["korisodg2"].ToString()
                    });
                else if (TempData["odg3"].ToString() == cvor["Rbr"].InnerText)
                    pitanja.Add(new Class1
                    {
                        resenje = cvor["Resenje"].InnerText,
                        pitanje = cvor["Pitanje"].InnerText,
                        odgKorisnika = TempData["korisodg3"].ToString()
                    });
            }

            return View(pitanja);
        }

    }
}
@*@{
    ViewBag.Title = "Index";
    }
@Html.ActionLink("Operater", "operater", "home")
@Html.ActionLink("Nova pitanja","index","home")
@using(Html.BeginForm("Index","home")){
    
<h2>Index</h2>

    foreach (MvcApplication3.Models.Class1 pitanje in Model)
{
    
    @pitanje.pitanje;
    <br />
    @pitanje.odg1;<br />
    @pitanje.odg2;<br />
    @pitanje.odg3;<br />
    @pitanje.odg4;<br />
    <hr />
}
<input type="text" name="odgg1"  /><br />
<input type="text" name="odgg2" /><br />
<input type="text" name="odgg3" /><br />
<input type="submit" value ="Potvrdi" />
}*@
@*@{
    ViewBag.Title = "operater";
}
@Html.ActionLink("Nova pitanja","index","home")

<h2>operater</h2>

@foreach (MvcApplication3.Models.Class1 pitanj in Model)
{
    @pitanj.pitanje;<br /> 
    @pitanj.resenje;<br /><br /><br />
    @pitanj.odgKorisnika;
    <hr />
}*@