Combine multiple lists vertically into a single string list

Question

I have the following lists of string

List<string> List1 = new List<string> { "P1", "P2", "P3" };
List<string> List2 = new List<string> { "Q1", "Q2", "Q3" };
List<string> List3 = new List<string> { "R1", "R2", "R3" };

//........
// Add List1,List2, List3 values Vertically  to CombileList

CombineList = { "P1", "Q1", "R1", "P2", "Q2", "R2", "P3", "Q3", "R3" };

I want to Add Values to CombineList from all lists vertically, as shown in CombineList, there can be n number of lists to add to CombineList the same way.

Have you tried anything? This shouldn't be too hard using loops. — Ivar, Apr 18 '17 at 08:16
This answer might be what you are looking for: http://stackoverflow.com/a/10298725/390819 — Cristian Lupascu, Apr 18 '17 at 08:17
http://stackoverflow.com/questions/40768322/merge-multiple-lists-with-variable-length-popping-elements-from-each — Dmitry Bychenko, Apr 18 '17 at 08:27

score 0 · Answer 1 · answered Apr 18 '17 at 08:20

If the lists are the same size you could use a for loop:

List<string> list1 = new List<string> { "P1", "P2", "P3" };
List<string> list2 = new List<string> { "Q1", "Q2", "Q3" };
List<string> list3 = new List<string> { "R1", "R2", "R3" };

List<string> combinedList = new List<string>();

for(int i = 0; i < list1.Count; i++)
{
    combinedList.Add(list1[i]);
    combinedList.Add(list2[i]);
    combinedList.Add(list3[i]);
}

score 0 · Answer 2 · edited May 23 '17 at 12:09

0

Similar question asked Here

using IEnumerator and the MoveNext() method, you can loop over the arrays and combine them how you like

edited May 23 '17 at 12:09

Community

1
1

answered Apr 18 '17 at 08:23

ThrowingSpoon

112
9

score 0 · Answer 3 · 2017-04-18T08:27:59.953

0

By using Enumerators:

public List<T> CombineVertically<T>(List<List<T>> Source)
        {
            List<T> result = new List<T>();

            var enumerators = Source.Select(x => x.GetEnumerator());
            while (enumerators.Where(x => x.MoveNext()).Count() > 0)            
                result.AddRange(enumerators.Select(x => x.Current));

            enumerators.ToList()
                .ForEach(x => x.Dispose());

            return result;
        }

edited Apr 18 '17 at 08:27

answered Apr 18 '17 at 08:24

1

`IEnumerator` implements `IDisposable`, do not forget to `Dispose` all the instances – Dmitry Bychenko Apr 18 '17 at 08:26
@DmitryBychenko u totally right – Apr 18 '17 at 08:28

Combine multiple lists vertically into a single string list

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