Edit a List<Tuple> item

Question

With a List<String> you can edit an item simply with this:

var index = List.FindIndex(s => s.Number == box.Text);
List[index] = new String;

But, how to apply it on a List<Tuple<string, string>> for example?

Answer 1

You can find the index in a similar way - by applying a condition to each tuple from the list:

var index = listOfTuples.FindIndex(t => t.Item1 == box1.Text || t.Item2 == box2.Text);

You can replace an item by calling Tuple.Create:

listOfTuples[index] = Tuple.Create(box3.Text, box4.Text);

Answer 2

var tuple = List.Find(s => s.Item1 == box.Text); 
//assuming you're searching for the first string, but you can change the predicate anyway. 
tuple = new Tuple<string, string>(new String, tuple.Item2);

As mentioned in the other answer, you can of course use the index too, but you can also just find the object and update it, that should work as well.