Question Animator: How to get parameter type from script?

I need to Know the parameter type from script. I need to Play animations like this:

I know this method exist
public AnimatorControllerParameter GetParameter(int index);
https://docs.unity3d.com/ScriptReference/Animator.GetParameter.html
But i don't know the index... and also it can be change... so i want use the name.

Code (CSharp):

1.  
2.  
3. //i want a method similar to this
4. Type type = animator.GetParameterType(parameterName);
5.  
6. //i want to do something like this
7. if( typeof(type) == typeof(bool) )
8. {
9.          animator.SetBool(parameterName, true);
10.          return;
11. }
12.  
13. if( typeof(type)==typeof(Trigger))
14. {
15.          animator.SetTriggerl(parameterName);
16.          return;
17. }
18.  
19.  

Is it possible to do? How?
Thank you so much!!

 

ok... i have this... but i think it is not good method to use in "Update()"

Code (CSharp):

1.  
2.  
3.         AnimatorControllerParameterType GetParameterType(string parameterName)
4.         {
5.             AnimatorControllerParameter param;
6.  
7.             for (int index = 0; index < animator.parameters.Length; index++)
8.             {
9.                 param = animator.GetParameter(index);
10.  
11.                 if (param.name == parameterName)
12.                 {
13.                     return param.type;
14.                 }
15.             }
16.             return (AnimatorControllerParameterType)(-1);
17.         }
18.  

a better way to do this?