'Find if method has optional parameters using System.Reflection in VB.Net

I am trying to find a way to know if there is an optional parameter in a method being called and its data types, by using Reflection in VB.Net. Can someone please explain with an example?

vb.net


Solution 1:[1]

This is really something that you could have figured out by reading the relevant documentation but, regardless, here's an example:

Module Module1

    Sub Main()
        Dim method = GetType(SomeClass).GetMethod(NameOf(SomeClass.DoSomething))

        For Each parameter In method.GetParameters().Where(Function(pi) pi.IsOptional)
            Console.WriteLine("{0} As {1}", parameter.Name, parameter.ParameterType)
        Next

        Stop
    End Sub

End Module


Public Class SomeClass

    Public Sub DoSomething(p1 As String, Optional p2 As Integer = 0, Optional p3 As Boolean = False)

    End Sub

End Class

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Source: Stack Overflow

Solution Source
Solution 1 user18387401

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