Using Type.InvokeMember to call a method of a class,Which
method has byref parameter,It seems that there is
no way to return the changed value of that byref
parameter by the method of the class.
Who can save me?
Thanks a lot!

"peter" <anonymous (AT) discussions (DOT) microsoft.com> wrote

parameter by reference, that gives the method in question access to the
original data, thus the capability to alter the original data without having
to return anything. Why would you need/want to return the changed value?

--
Peter [MVP Academic]

Thanks for your response.

For example,
an COM class named myclass ,it has a method named
mymethod an its VB code is like this:

Public Class myClass
Public Function mymethod(ByVal a As Integer, ByVal b
As Integer, ByRef c As Integer) As Integer
c = a - b
Return a + b
End Function
End Class

The class has been compiled into a COM dll named
myTest.dll,then use it in VB.NET,like this:

Dim Aobj() As Object = {15, 6, 3}
MsgBox(Aobj(2))
Dim obj As New myTest.myclass()
Dim T As Type = Type.GetTypeFromProgID("myTest.myclass")
dim d as object
d= T.InvokeMember("mymethod",
Reflection.BindingFlags.Public Or
Reflection.BindingFlags.InvokeMethod Or
Reflection.BindingFlags.Instance, Nothing, obj, Aobj)
MsgBox(Aobj(2))
MsgBox(d)

IN the code,the desired value of Aobj(2) is 9,but it
remains 3.
what shall I do ?
An early reply will be appreciated.