Question

I have a method which takes params object[] such as:

void Foo(params object[] items) {     Console.WriteLine(items[0]); } 

When I pass two object arrays to this method, it works fine:

Foo(new object[]{ (object)'1', (object)'2' }, new object[]{ (object)'3', (object)'4' } ); // Output: System.Object[] 

But when I pass a single object[], it does not take my object[] as the first param, instead it takes its all elements like I wanted to pass them one by one:

Foo(new object[]{ (object)'1', (object)'2' }); // Output: 1, expected: System.Object[] 

How do I pass a single object[] as a first argument to a params array?

Answer 1

A simple typecast will ensure the compiler knows what you mean in this case.

Foo((object)new object[]{ (object)'1', (object)'2' })); 

As an array is a subtype of object, this all works out. Bit of an odd solution though, I’ll agree.