IE9 JSON Data "do you want to open or save this file"

If anyone is using ASP.net MVC and trying to fix this issue - I used the following built in methods in the MVC framework. Simply update the content Type and encoding on the JsonResult.

public ActionResult Index(int id)
{
        // Fetch some data
        var someData = GetSomeData();

        // Return and update content type and encoding
        return Json(someData, "text/html", System.Text.Encoding.UTF8,
                        JsonRequestBehavior.AllowGet);
}

This fixed the issue for me!

(Answer originally posted for this question.)

If using MVC, one way of handling this is to implement a base controller in which you override (hide) the Json(object) method as follows:

public class ExtendedController : Controller
{
    protected new JsonResult Json(object data)
    {
        if (!Request.AcceptTypes.Contains("application/json"))
            return base.Json(data, "text/plain");
        else
            return base.Json(data);
    }
}

Now, your controllers can all inherit ExtendedController and simply call return Json(model); ...

without modifying the response content type for those browsers which play nicely (not <=IE9 !)
without having to remember to use Json(data, "text/plain") in your various Ajax action methods

This works with json requests which would otherwise display the "Open or Save" message in IE8 & IE9 such as those made by jQuery File Upload

IE9 JSON Data "do you want to open or save this file"

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