Does the method get called with a null value or does it give a null reference exception?
MyObject myObject = null;
myObject.MyExtensionMethod(); // <-- is this a null reference exception?
If this is the case I will never need to check my 'this' parameter for null?
Best Answer
That will work fine (no exception). Extension methods don't use virtual calls (i.e. it uses the "call" il instruction, not "callvirt") so there is no null check unless you write it yourself in the extension method. This is actually useful in a few cases:
etc
Fundamentally, calls to static calls are very literal - i.e.
becomes:
where there is obviously no null check.