Default Parameter Value ?

[Guest]

I there a way to provide a default value for a parameter in a method?

E.g.

private void somemethod(string whatever, string whatever2 = "someval")

 

[Guest]

Hi,
you cannot have optional parameters in C#, instead you can use method
overloading i.e.

private void SomeMethod(string whatever)
{
SomeMethod(whatever, "someval");
}

private void SomeMethod(string whatever, string whatever2)
{
//implement
}


Mark.

 

[Guest]

Thanks Mark.

Another quick question. I am calling methods from a COM object. These
methods contain optional parameters... in VB.NET I do not have to supply
values at all, just have to leave them blank. E.g.
SomeMethod("blah","blah",,,) or simply SomeMethod("blah","blah") . however,
in C# I receive a "no overload for method" error during compile. Why is it
in VB.NET I do not have to supply values but I must in C#? Is there a work
around?

Thanks a lot.

 

[Dave Sexton]

Hi,

In C# you must supply all parameters, including the COM-optional ones, so
Type.Missing is commonly used in cases like yours.

You may want to create a class that encapsulates the required functionality
of the COM object to provide a more .NET-centric wrapper for callers. You
can use Mark's method overloading suggestion to provide optional arguments
in C#. Although, many legacy COM classes provide an extraordinary number of
optional parameters (as in Office automation, for example) - too many to
create overloads for each possibility. In those cases it's important to
only wrap the functionality that you'll need.

 

[Cor Ligthert [MVP]]

If it goes in VB.Net with nothing (not the keyword) than it goes most
probably in C# with null, null, null, etc.

Cor