如何在ASP.NET MVC中上传带有其他数据的文件

Question

How can i upload a file with additional data in ASP.NET MVC? This is what I have so far:

 @using (Html.BeginForm("CreateSiteLogo", "SiteSettings", FormMethod.Post))
 {
     @Html.TextBoxFor(a=>a.SiteNameKey)

     <input type="file" name="logo" id="logo" />
     <input type="submit" />
 }

Action:

[HttpPost]
public ActionResult CreateSiteLogo(SiteSettingsAPIModel siteSetting)
{
    // Handle model
}

Model:

public class SiteSettingsAPIModel
{
    public int Id { get; set; }
    public string SiteNameKey { get; set; }
    public byte[] SiteLogo { get; set; }
    public string ImageFormat { get; set; }
}

I can only get the value of the input[text] but not the input[file]. I tried using Request.Files[0] but I'm always getting null.

Answer 1

If you are using file upload in View then you must specify the enctype = "multipart/form-data" in BeginForm

    @using (Html.BeginForm("CreateSiteLogo", "SiteSettings", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.TextBoxFor(a => a.SiteNameKey)

    <input type="file" name="logo" id="logo" />
        <input type="submit" />
}

and in the Controller side,

public ActionResult CreateSiteLogo(SiteSettingsAPIModel siteSetting, HttpPostedFileBase logo)
    {
        //Getting the file path
        string path = Server.MapPath(logo.FileName);

        //getting the file name
        string filename = System.IO.Path.GetFileName(logo.FileName);
        using (var binaryReader = new BinaryReader(logo.InputStream))
        {
            fileContent = binaryReader.ReadBytes(logo.ContentLength);
        }
        siteSetting.SiteLogo = fileContent;

        return View();
    }

the controller code shall be modified according to your requirement. Hope its helpful

Answer 2

This could help:

@model SandBox.Web.Models.SiteSettingsAPIModel
@using (Html.BeginForm("CreateSiteLogo", "SiteSettings", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    @Html.TextBoxFor(a => a.SiteNameKey)

    <input type="file" name="SiteLogo" id="logo" />
    <input type="submit" />
}

public class SiteSettingsAPIModel
{
    public int Id { get; set; }
    public string SiteNameKey { get; set; }
    public HttpPostedFileBase SiteLogo { get; set; }
    public string ImageFormat { get; set; }
}