Preview image using Fileupload asp.net mvc and Jquery

Question

I am trying to preview an image that the user is trying to upload. This is the code i am using.This is working fine in all major browsers, but i am wondering if there is a better way to achieve this without using session(even though i am clearing the session ) ? I don't want to use Flash.

   @using (Html.BeginForm("UploadImage", "Home", FormMethod.Post, new { id = "fileuploadform", @enctype = "multipart/form-data" }))
    {
        <input id="fileupload" type="file" onchange="ChangeImage()" name="files" multiple>
        <div id="preview">
            <img src="#" id="imgThumbnail" alt="preview" />
        </div>

    }
            <script>
            $(function ChangeImage() {
                $('#fileuploadform').fileupload({
                    done: function (e, data) {
                        var d = new Date();
                        $('#imgThumbnail')[0].src = "/Home/ImageLoad?a=" + d.getTime();
                    }
                });
            });
        </script>

[HttpPost]
public ActionResult UploadImage(IEnumerable<HttpPostedFileBase> files, PostViewModel model)
{

    Session["ContentLength"] = Request.Files[0].ContentLength;
    Session["ContentType"] = Request.Files[0].ContentType;
    byte[] b = new byte[Request.Files[0].ContentLength];
    Request.Files[0].InputStream.Read(b, 0, Request.Files[0].ContentLength);
    Session["ContentStream"] = b;
    return Content(Request.Files[0].ContentType + ";" + Request.Files[0].ContentLength);
}

   public ActionResult ImageLoad(int? id)
    {
        byte[] b = (byte[])Session["ContentStream"];
        int length = (int)Session["ContentLength"];
        string type = (string)Session["ContentType"];
        Session["ContentLength"] = null;
        Session["ContentType"] = null;
        Session["ContentStream"] = null;
        return File(b, type);
    }

Answer 1

Have you tried this solution?

Preview an image before it is uploaded

This solution is purely client side, and does not needed to be uploaded to your server before preview. :)

Answer 2

You could improve your action's code in this way:

HttpPostedFileBase picFile = Request.Files["fileUpload"];
if (picFile != null && picFile.ContentLength > 0)
{
     byte[] pic = new byte[picFile.ContentLength];
     picFile.InputStream.Read(pic, 0, picFile.ContentLength);
     // you can use pic ....
}