请求网址太长

Question

I getting this error " Request URL Too Long " when i tried to download the file. The url shows the data that i want to download but it doesn't download.

How can i solve Request URL Too Long error when downloading

my code

Javascript

 <script>
                    function DownloadIndexController(possID) {
                        $.ajax({
                            url: '@Url.Action("DownloadIndex", "Poss")',
                            contentType: 'application/json; charset=utf-8',
                            datatype: 'json',
                            data: { possID: possID },
                            type: "GET",
                            success: function (returnValue) {

                                window.location = '/DownloadIndex/Poss' + returnValue;
                            }
                        })
                    }
            </script>

Controller

  [HttpGet]
    public virtual ActionResult DownloadIndex(int possID)
    {
        try
        {
            possFilename = possFilename.Replace(",", ",");
            string fullPath = Filelocation + possFilename;
            return File(fullPath,  System.Net.Mime.MediaTypeNames.Application.Octet, possFilename);

        }
        catch (Exception ex)
        {
            throw ex;
        }

Answer 1

You cannot use ajax to download a file in that way. What you need to do is to generate a normal download link for every item in your grid, like:

@Html.ActionLink("Download", "DownloadIndex", "Home", new { possID = "123" }, null)

Where Home is the name of your controller, and you have to dynamically add the possID for every item instead of the hard coded 123 in my example.

Answer 2

In your code, you download the file using ajax, and then you redirect to an url containing the full file just after '/DownloadIndex/Poss'

You probably just want to redirect to the file, without using Ajax at all :

<script>
    function DownloadIndexController(possID) {
        window.location = '/DownloadIndex/Poss?possID=' + possID;
    }
</script>