CODEWITHSUNDEEP
c#asp.netasp.net-mvcasp.net-mvc-3amazon-s3
G_Man
G_Man

Reputation: 1343

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

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)

Upvotes: 3

Views: 3243

Answers (3)

Pure.Krome
Pure.Krome

Reputation: 87047

@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();
...

Upvotes: 1

hawkke
hawkke

Reputation: 4262

Does this help?

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

You've Been Haacked - Uploading Files

Upvotes: 4

Shyju
Shyju

Reputation: 218892

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.

Upvotes: 1

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