ASP.NET MVC 3 Redirect Query String with id

This tip is mostly because I’ve run into this issue a few times and keep forgetting what I did. The tip concerns an ASP.NET MVC 3 Query string property for redirect using the key ‘id’ when you have a route defined that uses ‘id’ as such:

"{controller}/{action}/{id}"

And you want to redirect to: mywebsite.com/controller/action?id=SomeValue

You also want to keep that id query string because it is a string value that can be a GUID or some string or even an integer. Yes I realize this is bad design but I was working on something out of my control.

The way to accomplish this is to use this:

Redirect(Url.Action("Action", "Controller") + "?id=" + id);

Instead of:

return RedirectToAction(“Action”, “Controller”, new { id = idvalue });

When you use RedirectToAction, it will format your url and remove the querystring which you want to keep. By using Redirect and forging the query string yourself, you get to keep the ‘?id’ part in the URL.

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