How to implement a file download in ASP.NET AJAX

Question

I would like to use standard ASP.NET file download response, like in other Stack Overflow question.

Response.ContentType = \"application/octet-stream\";
Respo         


        

Answer 1

I was able to solve this by calling a javascript function, which calls __doPostBack with no __EVENTTARGET.

 function GxGridView_Export(exportLink, exportType) {
     var containingGrid = $(exportLink).closest("table .GxGridViewWithSlider");
     __doPostBack('', containingGrid.attr('id') + "###" + exportType);
 }

The server side Grid then parses the __EVENTARGUMENT and renders the export file.

var eventArg = Page.Request.Form["__EVENTARGUMENT"];
if (!string.IsNullOrEmpty(eventArg) && eventArg.Contains("###"))
{
    var eventParams = eventArg.Split(new string[] { "###" }, StringSplitOptions.RemoveEmptyEntries);
    if (eventParams.Length == 2 && eventParams[0] == this.ClientID)
    {
        ExportGrid(eventParams[1]);
        return;
    }
}