I tried to add an action link to a view which would link to an action on a different controller but the links did not generate correctly and ended with ?length=5.
The following ActionLink was used on a view used by a job controller (JobController):
<%= Html.ActionLink("Edit", "Edit", "Query", new{ id = item.Id }) %>
This should have generated a link to the Edit action on the Query controller. However the links generated as follows:
http://<server here>/Job/Edit?Length=5
In other words they were still generated as if they were on the Job controller (I was using the standard {controller}/{action}/{id} type route).
The fix is to add null at the end of the call to ActionRoute:
<%= Html.ActionLink("Edit", "Edit", "Query", new{ id = item.Id }, null) %>
There are a stack of overrides of the ActionLink method and this forced ASP.Net MVC to use the right one.