Call a COM or VB.NET Method with Optional Parameter(s) from C#

Provided by:  FMS Development Team

Sometimes, the value you passed in does not matter. You can pass in a dummy value. Make sure pass in the right data type.

If the parameter is using the type "object" (or "variant" from VB/COM standpoint), there is a shortcut: you can just pass in this value:

If you need do this often, you could define it as a read-only member variable and use this variable instead, like this:

private readonly object def = System.Reflection.Missing.Value;

Return to the tips page