What is the most efficient way to ask a MethodInfo

问题:

What is the most efficient way to ask a MethodInfo if it accepts parameters and, if so, how many?

My current solutions would be: methodInfo.GetParameters().Any() and methodInfo.GetParameters().Count().

Is this the most efficient way?

Since I don't actually need any of the ParameterInfo objects, is there a way to do this without a call to GetParameters()?

回答1:

The two you listed are for LINQ. Any() returns bool - stating that there is at least one. Count() is used any on IEnumerable<T>.

Length (the property) will be the fastest because GetParameters() returns ParameterInfo[].

It does not appear that MethodInfo have any other way to access the number of parameters other than GetParameters().

回答2:

If efficiency matters why don't you just cache the result in a Dictionary<MethodInfo,int>? That way you only need to use reflection only once.

回答3:

If you want to get the count of parameters of a MethodInfo, then use the below code

int intLength = mi.GetParameters().Length; // where mi is a variable of type MethodInfo