How to upload large files using MVC 4?

Question

I had it working.. but I noticed once the files I was uploading get bigger (around 4000k) the controller would not be called..

So I added in chunking which fixed that problem.. but now when I open the file its full of garbage characters...

So what is the correct way to upload large files with plupload/MVC 4 ?

Here is my current code

  $(document).ready(function () {

    var uploader = new plupload.Uploader({
        runtimes: 'html5',
        browse_button: 'pickfiles',
        container: 'container',
     //   max_file_size: '20000mb',
        url: '@Url.Action("Upload", "Home")',
        chunk_size: '4mb',
        //filters: [
        //    { title: "Excel files", extensions: "xls,xlsx" },
        //    { title: "Text files", extensions: "txt" }
        //],
        multiple_queues: true,
        multipart: true,
        multipart_params: { taskId: '' }
    });

and the controller

  [HttpPost]
    public ActionResult Upload(int? chunk, string name, string taskId)
    {
        string filePath = "";
        var fileUpload = Request.Files[0];
        var uploadPath = Server.MapPath("~/App_Data/Uploads");
        chunk = chunk ?? 0;
        string uploadedFilePath = Path.Combine(uploadPath, name);
        var fileName = Path.GetFileName(uploadedFilePath);

 try
        {
            using (var fs = new FileStream(filePath, chunk == 0 ? FileMode.Create : FileMode.Append))
            {
                var buffer = new byte[fileUpload.InputStream.Length];
                fileUpload.InputStream.Read(buffer, 0, buffer.Length);
                fs.Write(buffer, 0, buffer.Length);
            }

            //Log to DB for future processing
            InstanceExpert.AddProcessStart(filePath, Int32.Parse(taskId));
        }

Answer 1

In web.config you need these (2GB all around):

<system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" maxRequestLength="2147483647" executionTimeout="1600" requestLengthDiskThreshold="2147483647" />
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="2147483647" />
      </requestFiltering>
    </security>
    ...
</system.web>