c# How to merge elements from different lists one by one to a list of different type

Question

I have a list of a certain type which looks like this:

class DestinationType {
    public string FruitName { get; set; }    
    public string VegetableName { get; set; }
}

What I want to do is create a list of the above type DestinationType and add elements to it from two different List of type string. The lists that have the values that I want to add to DestinationType looks like the ones below:

fruitList = List<string> { "apple", "orange" }

vegetableList = List<string> { "celery", "pumpkin" }

How can I add the elements from fruitList and vegetableList such that the end result would look like the one here?

List<DestinationList> theCompleteDestinationItem =
 [
    {
        fruitName: "apple",
        vegetableName: "celery"
    },
    {
        fruitName: "orange",
        vegetableName: "pumpkin"
    }
]

Create a constructor for your DestinationType class that takes in 2 stings as parameters. Then append that constructed object to you List. — user3750325, Oct 01 '20 at 23:11

score 0 · Answer 1 · answered Oct 01 '20 at 23:14

You could use the Enumerable.Zip to combine the elements of both lists then project into a type of your choosing or an anonymous type or ValueTuple

Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results.

Given

var fruitList = new List<string> {"apple", "orange"};
var vegetableList = new List<string> {"celery", "pumpkin"};

Example

var results = fruitList.Zip(vegetableList, (fruit, vegetable) => new {fruit, vegetable});

foreach (var result in results)
   Console.WriteLine($"{result.fruit}, {result.vegetable}");

Output

apple, celery
orange, pumpkin

Or if you have a readymade type

public class Destination
{
   public string Fruit { get; set; }
   public string Vegetable { get; set; }
}

...

var results = fruitList.Zip(vegetableList, (fruit, vegetable) => 
   new Destination( )
   {
      Fruit = fruit,
      Vegetable = vegetable
   });

score 0 · Answer 2 · answered Oct 01 '20 at 23:18

0

you could use zip:

        var fruitList = new List<string> { "apple", "orange" };
        var vegetableList = new List<string> { "celery", "pumpkin" };
        var fruitAndVeggies = fruitList.Zip(vegetableList, (fruit, veggie) => new DestinationType() { FruitName = fruit, VegetableName = veggie});

answered Oct 01 '20 at 23:18

audzzy

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I just saw someone beat me to it :) – audzzy Oct 01 '20 at 23:20

c# How to merge elements from different lists one by one to a list of different type

2 Answers2