Photo uploading in ASP.NET MVC - encountering null HttpPostedFileBase issue

QUESTION:

I'm having an issue where the Photo1 value is null in the controller post method despite uploading it. Can someone help with this?

This is my model class:

class ProductVM{
    public string Name { get; set;}
    public string Color {get; set;}
    public HttpPostedFileBase Photo1 { get; set; }
    }

Below is how I implemented the view using Razor:

@model Project.Models.ProductVM

@using (Html.BeginForm("AddItem","Item", FormMethod.Post, new { enctype = "multipart/form-data" }))
{


   @Html.AntiForgeryToken()
    @Html.ValidationSummary(true, "", new {@class = "text-danger"})

    @Html.EditorFor(model => model.Name, new {htmlAttributes = new {@class"form-control"}})
    @Html.ValidationMessageFor(model => model.Name)

// other fields editor's and dropdown's ...


<div class="col-xs-offset-2 col-xs-8 add-item-rectangle"><input type="file" name="@Model.Photo1" id="file"/></div>
<div class="col-xs-10 add-item-rectangle"></div>

<input type="submit" class="btn btn-block add-item-button-text" value="Send"/>

This is the code for the Post Controller method:

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult AddItem(ProductVM product)
{            
 //**heere when debuging Photo1 is null despite fact that i uploaded photo**

if (!ModelState.IsValid)
{
    //... my stuffs
}

//..
return RedirectToAction("Index", "Home");
}

Answer №1

To start off, it is not possible to directly post to a byte array. Therefore, you will need a view model to represent the product being created or modified. In your view model, make sure that your file upload properties are typed as HttpPostedFileBase:

public HttpPostedFileBase Image1Upload { get; set; }
public HttpPostedFileBase Image2Upload { get; set; }

Your post action should accept your view model as a parameter:

[HttpPost]
public ActionResult CreateProduct(ProductViewModel model)

Within this action, you will need to map the posted values from the view model to the corresponding properties on your entity class. For handling uploads:

if (model.Image1Upload != null && model.Image1Upload.ContentLength > 0)
{
    using (var ms = new MemoryStream())
    {
        model.Image1Upload.InputStream.CopyTo(ms);
        product.Image1 = ms.ToArray();
    }
}

Repeat the process for any other uploads. It is also recommended to add validation to ensure that the uploaded files are indeed images.

Lastly, save your entity as usual.

UPDATE

In your updated code snippet, you have the following:

<div class="col-xs-offset-2 col-xs-8 add-item-rectangle">
    <input type="file" name="@Model.Photo1" id="file"/>
</div>

Using @Model.Photo1 would simply output the value of Model.Photo1, which does not work with a file input. Instead, Razor would just call ToString on the property and result in a name attribute like

name="System.Web.HttpPostedFileBase"
. This is incorrect. You should instead use something like:

<input type="file" name="@Html.NameFor(m => m.Photo1)" id="file" />

Alternatively, consider using a helper to generate the entire input:

@Html.TextBoxFor(m => m.Photo1, new { type = "file" })

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