Convert tuple to list

Question

I need to convert different tuples to lists of strings.

How can i convert a tuple that contains different types to a list of strings in C#?

And of curse i need a generic solution for different tuples.

Example:

I want to convert this tuple to a list: ("word", 1, 's', US)

Does this answer your question? [C# ValueTuple of any size](https://stackoverflow.com/questions/56413583/c-sharp-valuetuple-of-any-size) — Jacob Huckins, Jun 16 '20 at 17:11
I suppose you could use reflection to enumerate the values of the tuple and cast them. Does this help? https://www.danielcrabtree.com/blog/365/accessing-tuples-at-runtime-using-reflection — Hal, Jun 16 '20 at 17:12

Dmitry Bychenko · Answer 1 · 2020-06-16T19:10:24.383

3

Linq solution:

 using System.Linq;
 using System.Runtime.CompilerServices;

 ...

 public static List<string> TupleToList(ITuple value) {
   if (null == value)
     throw new ArgumentNullException(nameof(value));

   return Enumerable
     .Range(0, value.Length)
     .Select(i => value[i]?.ToString()) // ?. - don't call ToString() on null
     .ToList();
 }

Fiddle

edited Jun 16 '20 at 19:10

answered Jun 16 '20 at 17:21

Dmitry Bychenko

180,369
20
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215

i can't use the ITuple interface because it's inaccessible due to protection level – Alon Ehrenlieb Jun 16 '20 at 19:04
@Alon Ehrenlieb:Sorry, it seems that you should add `using System.Runtime.CompilerServices;`; I've provided fiddle as well – Dmitry Bychenko Jun 16 '20 at 19:16
it didn't work for me. I have also tried to install the nugget. – Alon Ehrenlieb Jun 16 '20 at 19:49
@AlonEhrenlieb Which .NET and C# version are you using? – Pavel Anikhouski Jun 16 '20 at 19:58
@PavelAnikhouski .NET 4.7, and C# version is automatically selected based on .NET version – Alon Ehrenlieb Jun 17 '20 at 13:14
`ITuple` is available from .Net 4.7.1 onwards: https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.ituple – Manish Jun 18 '20 at 06:33

Jacob Huckins · Answer 2 · 2020-06-16T17:33:14.553

Modified from Kobi Hari's answer from C# ValueTuple of any size

I added some LINQ to convert each element to a string before returning to fit the question requirements.

public List<string> TupleToStringList(ITuple tuple)
{
  var result = new List<object>(tuple.Length);
  for (int i = 0; i < tuple.Length; i++)
  {
    result.Add(tuple[i]);
  }
  return result.Select(obj => obj.ToString()).ToList();
}

Or using the original method and converting to strings as a separate step

public List<object> TupleToString(ITuple tuple)
{
  var result = new List<object>(tuple.Length);
  for (int i = 0; i < tuple.Length; i++)
  {
    result.Add(tuple[i]);
  }
  return result;
}

// your code
{
    ...
    List<object> objectList = TupleToString(tupleToConvert);
    List<string> stringList = objectList.Select(obj => obj.ToString());
}

i can't use the ITuple interface because it's inaccessible due to protection level. And i added using System.Runtime.CompilerServices; — Alon Ehrenlieb, Jun 17 '20 at 23:33

Manish · Answer 3 · 2020-06-18T06:37:18.897

Try this:

using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {
            string x = null;

            var t = ("word", 1, 's', "US");
            foreach (var item in TupleToList(t))
            {
                Console.WriteLine(item);
            }
        }

        private static List<string> TupleToList(ITuple tuple)
        {
            var result = new List<string>(tuple.Length);
            for (int i = 0; i < tuple.Length; i++)
            {
                result.Add(tuple[i].ToString());
            }
            return result;
        }
    }
}

The TupleToList takes a ITuple as parameter and returns list of string. Goes without saying, there could be issues based on what the tuple contains which you might need to handle.

I think it's not working for me because apparently i'm using ValueTuple and not Tuple, can you provide me the solution for valueTuple? Sorry for not mentioning it before. — Alon Ehrenlieb, Jun 17 '20 at 23:32

score 0 · Answer 4 · answered Jun 16 '20 at 17:34

0

Use Value Tuple

var result = return (type1, type2, type3);

return new ModelDto()
            {
                Model1= result.Item1,
                Model2= result.Item2,
                Model3= result.Item3
            };

answered Jun 16 '20 at 17:34

sabuj

1
1

Convert tuple to list

4 Answers4