how to get parameter names from an expression tree?

Question

I have a expression of this type:

Expression<Action<T>> expression

how do I get the parameters names from this expression (optional: and values) ?

example:

o => o.Method("value1", 2, new Object());

names could be str_par1, int_par2, obj_par3

Answer 1

Expression<Action<Thing>> exp = o => o.Method(1, 2, 3);
var methodInfo = ((MethodCallExpression)exp.Body).Method;
var names = methodInfo.GetParameters().Select(pi => pi.Name);