Routing constraints lets you restrict how the parameters in the route template are matched. It helps to filter out the input parameter and action method can accept.
Routing constraints let you restrict how the parameters in the route template are matched. It helps to filter out the input parameter and action method it can accept.
For example, if the URL Parameter is restricted to have int value, the route engine will match the controller action having integer value in the parameter or restrict it.
How Route Constraints are applied:
When the route engine matches the incoming url, it invokes the routing constraint to the values in the url which match the pattern. In this case which is seperated by : in the above example restricts the value should be int or null.
Here's a quick example on how the routing constraints are defined and used.
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