c# - understand the following lambda -

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i have method like

void test(func<bool> f) {     f.invoke(); }

i pass in test( ()=>getitem("123") )

f.invoke() called getitem("123").

i want know how f know getitem has parameter?

what passing test parameter-less delegate calls getitem method. test method not know parameters getitem. knows delegate calling.

test( ()=>getitem("123") )

is equal to

test(delegate { return getitem("abc") ; } );

which calling 

test(mymethod)    ... bool mymethod() {     return getitem("123"); }

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