Mvc - controller initializes every time how can I store uploaded files in the list before submit?

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Hi I have a complete rookie question.So I am using Dropzone js and before submitting my form I upload some files to database (of course user can delete what update before the submit the form). My question is in every succesfull update to database I also add files to list in my controller to be used in when the submit button clicked. Where should I store uploaded files in controller. What is the best practice t do this?

AttachementsC the list I was thinking about to use after submit my form but it is always null.

What I have tried:

C#

public class CreateTicketController
   {
       
       
       private List<Attachment> AttachementsC = new List<Attachment>();}
     public void UploadFiles()
        {
            Response.ContentType = "text/plain";

            string id = "";
            foreach (string s in Request.Files)
            {
                
                var headers = Request.Headers;
                if (string.IsNullOrEmpty(headers["X-File-Name"]))
                {
                    UploadWholeFile(Request,out id);
                }
               
            }
            Response.Write(id);
            
        }
        private void UploadWholeFile(HttpRequestBase request, out string id)
        {
            id = string.Empty;
            for (int i = 0; i < request.Files.Count; i++)
            {
                var file = request.Files[i];
                Attachment cAttachement = new Attachment();
                if (cAttachement.AttachmentActions.fillAttachmentObject(file))
                {
                    id = Convert.ToString(cAttachement.ID);
AttachementsC.Add(cAttachement);
                }
                else
                {
                    id = string.Empty;
                }
            }
        }

Posted 14-Apr-16 3:28am

Ermany

Updated 14-Apr-16 4:16am

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F-ES Sitecore · Accepted Answer · 2016-04-14T04:16:00

Some classes

C#

public class FileUpload
{
    public int ID { get; set; }
    public string Filename { get; set; }
}

public class UploadModel
{
    public List<FileUpload> Files { get; set; }
}

The view

Razor

@model UploadModel

@if (Model.Files.Any())
{
    <table>
        @foreach (FileUpload file in Model.Files)
        {
            <tr>
                <td>@file.ID</td>
                <td>@file.Filename</td>
            </tr>
        }
    </table>
}

@using (Html.BeginForm("Upload", "Home"))
{
    for(int i = 0; i < Model.Files.Count; i++)
    {
        @Html.HiddenFor(m => m.Files[i].ID)
        @Html.HiddenFor(m => m.Files[i].Filename)
    }
    
    <span>Filename:</span><input type="text" name="filename"/>
    <input type="submit" value="Upload"/>
}

Controller

C#

[HttpGet]
public ActionResult Index()
{
    UploadModel model = new UploadModel();
    model.Files = new List<FileUpload>();

    return View(model);
}

static int NextID = 1;

[HttpPost]
public ActionResult Upload(UploadModel model, string filename)
{
    if (model.Files == null)
    {
        model.Files = new List<FileUpload>();
    }

    // I'm grabbing the filename direct from the form post, in reality you'll get it via
    // a file upload control etc.

    FileUpload file = new FileUpload();
    file.Filename = filename;

    // here I'm just incrementing the ID using a static variable
    // your ID will come from the database
    file.ID = NextID++;

    model.Files.Add(file);

    return View("Index", model);
}