Can extensions methods be called on no-object?

Question

Why does the following piece of code work? call: ``` SomeObject sO = null; bool test = sO.TestNull(); ``` code: ``` public static bool TestNull(this SomeObject sO) { return sO == null; } ``` Is this allowed to work or just a bug?

Accepted Answer

Assuming you meant

```
bool test = sO.TestNull();
```

Then the answer is just that static functions do not need an instance of the object. Also, calling an extension function is just syntactic sugar for calling the function with parameters.

edit:

I recommend also reading Jon Skeet's answer.

Can extensions methods be called on no-object?

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