I've been messing about with extension methods and noticed something, not
wrong, but slightly limited about them, and wondered why.
If I create an extension method that returns the first element of a
generic list....you would expect the signature to be....
static T GetFirstElement<T>(this System.Collections.Generic.IList<T> list)
now clearly the compiler can and does recognise this as a valid extension
method on IList<>....but what seems odd is that it requires me to
specify "T" in the method, as it is implicitly defined in the 'this'
parameter....i.e.
static T GetFirstElement(this System.Collections.Generic.IList<T> list)
should be enough....i.e. it should be able to infer 'T'...without it being
specified explicitly
i.e.
void fooBar(IList<string> foo)
{
string s = foo.GetFirstElement(); // this should be enough
}
but it complains....it wants T to be explicitly defined in the method call
(and signature), even though there is actually only 1 type it can possibly
be.
Am I missing something?
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