Question

I have three data structures,

Tuple<string, string> parentid = null;
var subids = new List<Tuple<int, int>>();
Tuple<string, string> dname = null;

ArrayList al = new ArrayList();
al.add(parentid);
al.add(subids);
al.add(dname);

and I call a function which returns an ArrayList containing those 3 data structures.

For example

ArrayList al = category.getTree();

and now I want to pass the data structure to another method

string option = category.printOption(al[0], al[1], al[2], 0);

The printOption code:

public string printOption(Tuple<string, string> parents, List<Tuple<int, int>> subids, Tuple<string, string> dname, int indent)

But there is an error :

the best overloading method…….

Anyone know what the problem is?

Answer 1

ArrayList stores objects, so to use the contents you will need to cast each object you want to use to its correct type:

string option = category.printOption((Tuple<string, string>)al[0],
    (List<Tuple<int, int>>)al[1], (Tuple<string, string>)al[2], 0);