Question

I need to get the index of a Tuple<string,string,string,string> in a List with three given items, but it doesn’t matter what the fourth is. Ex:

Listoftuples.IndexOf(new Tuple<string,string,string,string>("value1","value2","value3","this value does not matter"))

Is there a wild card characters when it comes to indexes, or is there a different way to go about this?

Answer 1

int index = Listoftuples.FindIndex(t => t.Item1 == "value1" && t.Item2 == "value2" && t.Item3 == "value3");

You might want to create a function to create the predicate:

Func<Tuple<string,string,string,string>, bool> CreateMatcher(string first, string second, string third)
{
    return t => t.Item1 == first && t.Item2 == second && t.Item3 == third;
}

then you can use

int index = Listoftuples.FindIndex(CreateMatcher("value1", "value2", "value3"));