How To Upload Image

Question

I am getting the following error whilst uploading a file.

The parameters dictionary contains a null entry for parameter 'category_id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult AddProduct(Int32, System.String, Single, System.String, System.String, System.String, System.String, System.String, System.String)' in 'Ecommerce.Controllers.AdminController'. To make a parameter optional its type should be either a reference type or a Nullable type. Parameter name: parameters

I am using a dialog box.

The View

<script type="text/javascript">
        $(function() {
        $("#dialog").dialog({
            bgiframe: true,
            height: 140,
            modal: true,
            autoOpen: false, 
            resizable: false
            })
    });

</script>

<div id="dialog" title="Upload files">
    <% using (Html.BeginForm("Upload", "File", FormMethod.Post, new { enctype = "multipart/form-data" }))
        {%>
            <p><input type="file" id="fileUpload" name="fileUpload" size="23"/> </p>
            <p><input type="submit" value="Upload file" /></p>
        <% } %>
</div>

<p>
    <label for="image_name">image_name:</label>
    <a href="#" onclick="jQuery('#dialog').dialog('open'); return false">Upload File</a>

    <%= Html.ValidationMessage("image_name", "*") %>
</p>

The Controller Action

public ActionResult AddProduct(int category_id, string product_name, float product_price, string product_desc, string weight, string image_name, string img_content, string available_qty, string isFeature)
{

    foreach (string inputTagName in Request.Files)
    {
        HttpPostedFileBase file = Request.Files[inputTagName];
        if (file.ContentLength > 0)
        {
            string filePath = Path.Combine(HttpContext.Server.MapPath("../Uploads"), Path.GetFileName(file.FileName));
            string filecontent = Path.Combine(HttpContext.Server.MapPath("../Uploads"), Path.GetFileName(file.ContentType));

            image_name = Path.GetFileName(file.FileName);
            img_content = Path.GetFileName(file.ContentType);

            file.SaveAs(filePath);
        }
    }

    AdminImplementation _adminImplementation = new AdminImplementation();

    Boolean isfeature = Convert .ToBoolean(isFeature);

    if (isfeature)
    {
        isFeature = "Featured";
    }
    else
    {
        isFeature = "NotFeatured";
    }


    int i = _adminImplementation.addproduct(category_id, product_name, product_price, product_desc, weight,image_name ,img_content ,available_qty ,isFeature );

    ViewData["succm"] = "Product added successfully";
    return View();
}

Please suggest some useful answers.

Thanks

Ritz

Answer 1

Looks to me like you're not providing all the parameters required for a specific ActionResult. category_id isn't being provided to AddProduct. You'd need to show us your code for us to be able to find out what's really going wrong.

How are you calling that ActionResult?