c# - Can I use some other class's function as a delegate? -

say have 2 classes, class , class b. class creates instance of class b. class has function pass method class b.

class {   void main(string[] args) {     b classb=new b();      delegatecaller(new delfunction(classb.thefunction());   // <-- won't compile (method name expected)     delegatecaller(new delfunction(b.thefunction());        // <-- won't compile (object reference req'd)   }    public delegate string delfunction();    public delegatecaller(delfunction func) {     system.console.writeline(func());   } }  class b {   public string thefunction() {     return "i'm printing!!!";   } } 

i'm not sure if syntax issue or it's can't do. maybe need define delegate in b, reference in a? b's this pointer?

it's syntax issue; rid of parentheses after classb.thefunction - indicate wish invoke method.

delegatecaller(new delfunction(classb.thefunction)); 

do note there implicit conversion available method-group, can do:

delegatecaller(classb.thefunction); 

also note creating own delegate-type in case unnecessary; use in-built func<string> type.

edit: darin dimitrov points out, there unrelated issue of calling instance method though static method.