Question

Got a strange one and I know it is something silly but I can’t see it for anything!

I have a DLL created in VB.net (No I can’t change it! :-)) and am calling it from C#. The problems come at the point the object is created in C# and I get the message that it has “some invalid arguments”.

The constructor code in the DLL is as follows:

Sub New(ByRef Connection As IConnection)

The code in C# is:

IConnection conn = new Connection();  
CustomObject test = new CustomObject(conn)

It is happy with the first line but it gives the error message (“some invalid arguments”) on the second line.

I have also created a secondary project in VB.net and called the DLL and it works fine there.

What am I doing wrong?

Thanks in advance,

Andy

Answer 1

In C# if a parameter is “ByRef” you have to specify it when you call the function

CustomObject test = new CustomObject(ref conn);