How do I write a C# method that takes a variable number of arguments?

Question

Is it possible to send a variable number of arguments to a method?

For instance if I want to write a method that would concatenate many string[] objects into one string, but I wanted it to be able to accept arguments without knowing how many I would want to pass in, how would I do this?

Answer 1

You would do this as:

string ConcatString(params string[] arguments)
{
   // Do work here
}

This can be called as:

string result = ConcatString("Foo", "Bar", "Baz");

For details, see params (C# Reference).

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FYI - There is already a String.Concat(params object[] args) - it will concatenate any set of objects by calling ToString() on each. So for this specific example, this is probably not really that useful.