Loop a list with a Tuple C#

Question

I have a list in C# called MyList:

List<Tuple<string, int, int>> MyList= new List<Tuple<string, int, int>>() 
        {
           Tuple.Create("Cars", 22, 3),
           Tuple.Create("Cars", 28, 5),
           Tuple.Create("Planes", 33, 6)
        };

I want to loop through the whole list in the same order as I filled it above and be able to get the values one by one for each list item, like Cars, 22, 3. How do I do that? I guess I have to use ForEach somehow.

Photophilous

You would generally write a loop in order to loop over a collection, yes. What have you tried and what didn't work? – Paterfamilias

A loop is indeed what you would need! – Perdue

You can switch to named tuples, it's more clear and readable – Cocainism

I know that I need a loop. But I don't know how to write it. This is what i did: ´ MyList.ForEach(Tuple<string, int, int> tuple) { };` – Photophilous

@Photophilous that's not a loop. That's an attempt to use the ForEach method with an incorrect lambda syntax. foreach(var ... in MyList){ ... } is a loop – Eumenides

@Photophilous you can use simple for loop as it is in my answer below. – Playhouse

Answer 1

You can use simple foreach loop for that, Item1, Item2 and Item3 represent an unnamed tuple items with corresponding types

foreach (var item in MyList)
{
    string name = item.Item1;
    int value = item.Item2;
    int something = item.Item3;
}

You can also switch to named tuples, which are available from C# 7. They are more readable and allow to define a custom name for tuple item and use a deconstruction

var MyList = new List<(string name, int value, int someting)>()
{
    ("Cars", 22, 3),
    ("Cars", 28, 5),
    ("Planes", 33, 6)
};

foreach (var item in MyList)
{
    var name = item.name;
    var value = item.value;
}

Cocainism

It works but I get the type or namespace name 'ValueTuple' does not exist in the namespace 'System when using named tuples. – Photophilous

@Photophilous it's available from C# 7 and .NET 4.6.1. You can try to install System.ValueTuple package, if you don't have it from the box – Cocainism

@KGB91, you can use my answer which is more simple. – Playhouse

Yeah but it is easier to fill the tuples with this code :) – Photophilous

Answer 2

If you want to be more declarative about what your values are you can explicitly set them in a foreach loop like this:

List<Tuple<string, int, int>> myList= new List<Tuple<string, int, int>>() 
        {
           Tuple.Create("Cars", 22, 3),
           Tuple.Create("Cars", 28, 5),
           Tuple.Create("Planes", 33, 6)
        };    

foreach ((string type, int fuel, int amount) vehicles in myList) {
        string item1 = vehicles.type;
        int item2 = vehicles.fuel;
        int item3 = vehicles.amount;
    }

Mamoun

Answer 3

This is an easy to understand and simple solution that will help you.
You can use a for loop.

• Item1 (string),
• Item2 (int),
• Item3 (int)

are the Tuple Items in the order and in the format that you have placed them.

And the code below is the loop.

for (int i = 0; i < MyList.Count; i++)
{
     string item1 = MyList[i].Item1;
     int item2 = MyList[i].Item2;
     int item3 = MyList[i].Item3;
}

Playhouse