Question

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C#: Passing null to overloaded method – which method is called?

Consider these 2 methods:

void Method(object obj)  { Console.WriteLine("object"); }
void Method(int[] array) { Console.WriteLine("int[]"); }

When I try calling:

Method(null);

in Visual Studio 2008 SP1 I get int[].

Why is this?

Answer 1

It is a product of overload resolution. Your argument, null, is convertible to both object and int[]. The compiler therefore picks the most specific version, because int[] is more specific than object.