c# - Func<> with lambda expression -

i have found following part of code in examples while learning func<> syntax:

  public static class lambda     {         public static int myfunc(func<string, int> func)         {             //some logic             return 0;         }     } 

and sample call :

var getint = lambda.myfunc((url) => { console.writeline(url); return 0; } 

and question :

why passing above func lambda expression (url) allowed if value never assigned ( or maybe ?)? point of passing func ?

edit : clarify question . wondering sample call - why passing string argument above (using lambda (url) => {} ) not forbidden compiler if value can not initiated. there example can useful passing string above ?

url name of parameter lambda expression. it's writing method this:

public static int foo(string url) {     console.writeline(url);     return 0; } 

then creating delegate it:

func<string, int> func = foo; 

now in order call delegate, need provide string - , becomes value of parameter, if called method normally:

int result = func("some url");