Ref parameters and reflection

Question

I\'m not sure if I\'m totally missing something here but I can\'t find any way to determine if a parameter is passed by reference or not by using reflection.

Argumen

Answer 1

ParameterType.IsByRef will return true for both ref and out parameters.

If you have a ParameterInfo object (e.g. from MethodInfo.GetParameters()), then:

• The param is out if parameterInfo.ParameterType.IsByRef && parameterInfo.IsOut
• The param is ref if parameterInfo.ParameterType.IsByRef && parameterInfo.IsOut == false

If you don't do the IsByRef check for out parameters, then you'll incorrectly get members decorated with the [Out] attribute from System.Runtime.InteropServices but which aren't actually C# out parameters.