Uploading an Image to Amazon S3 using ASP.Net MVC 3

Question

I am having an issue on the controller side using ASP.Net MVC 3 trying to upload an image to amazon s3. Here is what I have and the error.

Here is my HTML form.

@using (Html.BeginForm())
{
    <div class="in forms">

        <input type="file" id="file" name="file" class="box" /></p>

        <p><input type="submit" value="Upload" id="btnSubmit" class="com_btn" /></p>

}

And here is the code in my controller

[HttpPost]
    public ActionResult Index(HttpPostedFileBase file)
    {
        AmazonS3 client = Amazon.AWSClientFactory.CreateAmazonS3Client("*redacted*","*redacted*");
        if (file.ContentLength > 0)
        {
            var request = new PutObjectRequest();
            request.WithBucketName("*redacted*");
            request.WithKey(file.FileName);
            request.FilePath = Path.GetFullPath(file.FileName);
            request.ContentType = file.ContentType;
            request.StorageClass = S3StorageClass.ReducedRedundancy;
            request.CannedACL = S3CannedACL.PublicRead;
            client.PutObject(request);
            return Redirect("UploadSuccess");
        }
        return RedirectToAction("Index");
    }

The error I am getting is.

Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 28: if (file.ContentLength > 0)

hawkke · Accepted Answer · 2011-12-12 03:03:55Z

4

Does this help?

using (@Html.BeginForm(new { enctype = "multipart/form-data" }))

You've Been Haacked - Uploading Files

answered Dec 12, 2011 at 3:03

hawkke

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3 Comments

G_Man Over a year ago

This didn't change anything unfortunetly

hawkke Over a year ago

Change it to this: @using (Html.BeginForm("Index", "YourController", FormMethod.Post, new { enctype = "multipart/form-data" }))

G_Man Over a year ago

@using (Html.BeginForm("Index", "YourController", FormMethod.Post, new { enctype = "multipart/form-data" })) <-- This Fixed It

Shyju · Accepted Answer · 2011-12-12 03:03:18Z

1

Use break points and debug the code. See whether your objects are null or not. Accessing a property / method of a null object will give you this error usually.

answered Dec 12, 2011 at 3:03

Shyju

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1 Comment

G_Man Over a year ago

I have done this HttpPostedFileBase file is coming up as null for some reason even though I am passing the input type of file from the chtml page.

Pure.Krome · Accepted Answer · 2011-12-12 04:19:57Z

1

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

and change

if (file.ContentLength > 0)

to

if (file == null || file.ContentLength <= 0)
{
    // Add some client side error message.

    // Return the view
    return View();
}

// Upload...
var request = new PutObjectRequest();
...

answered Dec 12, 2011 at 4:19

Pure.Krome

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