Trigger method inside OnParametersSet only when all the parameters are set

[Ccry11]

Hi everyone,
reading the docs I have seen that OnParametersSet is fired every time a parameter is set.
There are no problems if you have only one parameter, for example: myapp.com/movie/{MovieId}.
In this case, inside OnParametersSet you can get the MovieId value and make the query to retrive the movie data, but in case you have two or more parameters, for example: myapp.com/movie/{FilterType}/{FilterValue}, the OnParametersSet is fired twice, one time for the FilterType and one time for FilterValue parameter, so the method inside OnParametersSet will be executed twice.
I would like to execute the method inside OnParametersSet only once when all the parameters are set.
Is there a way to do it ?
Thank you all