CODEWITHSUNDEEP
c#list
Emerica.
Emerica.

Reputation: 568

Creating a list within a list C#

If I have 2+ lists of int numbers is there a way I can store those lists inside another list to pass it to another class or method? I want to be able to access each list individually, but I want to be able to pass them all together in one batch. What would be the syntax this and also what would be the proper method of accessing each list within the master list. Example, I have these individual lists:

List<int> Nums1= new List<int>(new int[] { 6, 76, 5, 5, 6 });
List<int> Nums2= new List<int>(new int[] { 6, 4, 7, 5, 9 });
List<int> Nums3= new List<int>(new int[] { 22, 11, 5, 4, 6 });

I want to then store these in another list to pass to a method such as:

static public List<int> DoSomething (List<int> Allnums)
{

//My calculations

}

Then I want to be able to store them back into a master list and return them to my main.

Upvotes: 4

Views: 14746

Answers (7)

Usama Tabbassum
Usama Tabbassum

Reputation: 49

I have a similar scenario to create a list of list of a class says ChildClass.

  public class ChildClass
    {
        public string FieldName { get; set; }
        public string Value { get; set; }
        public string StatusClass { get; set; }
        public string StatusMessage { get; set; }
    }

Creating a list of list of ChildClass is as follows:

 List<List<ChildClass>> o = new List<List<ChildClass>> {
            new List<ChildClass>{
           new ChildClass { FieldName = "Name", Value = "Abc", StatusClass = "alert alert-warning", StatusMessage = "This is Name"},
                new ChildClass { FieldName = "Unit Price", Value = "1000", StatusClass = "", StatusMessage = "This is Price"},
               new ChildClass { FieldName = "Type", Value = "Test Type 1", StatusClass = "", StatusMessage = "This is Type"},
               new ChildClass { FieldName = "Status", Value = "true", StatusClass = "", StatusMessage = "This is Status"},
            },
              new List<ChildClass>{
           new ChildClass { FieldName = "Name", Value = "PQR", StatusClass = "", StatusMessage = "This is Name" },
                new ChildClass { FieldName = "Unit Price", Value = "500", StatusClass = "", StatusMessage = "This is Price" },
               new ChildClass { FieldName = "Type", Value = "Test Type 2", StatusClass = "", StatusMessage = "This is Type" },
               new ChildClass { FieldName = "Status", Value = "True", StatusClass = "alert alert-danger", StatusMessage = "This is Status"},
            }
            };

Upvotes: 0

Oded
Oded

Reputation: 498904

You can use a List<List<int>> type to hold a list of lists.

List<List<int>> allNums = new List<List<int>>();

allNums.Add(Nums1);
allNums.Add(Nums2);
allNums.Add(Nums3);

DoSomething(allNums);

//elsewhere
static public List<int> DoSomething (List<List<int>> Allnums)
{

//My calculations

}

With later versions of C# (I believe C# 6 and onwards) you can use collection initializer notation:

var allNums = new List<List<int>>{ Nums1, Nums2, Nums3 };

Upvotes: 10

BLUEPIXY
BLUEPIXY

Reputation: 40145

//static public List<int> DoSomething (List<int> Allnums)
DoSomething(Nums1.Concat(Nums2).Concat(Nums3).ToList());

Upvotes: 0

yoni
yoni

Reputation: 191

what is wrong with : 

Tuple<List<int>,List<int>>

Upvotes: 0

Jordy Langen
Jordy Langen

Reputation: 3591

It depends, as already given as an awnser, you could use a List<List<int>> . Although, since we are using a OO language, and if the amount of lists of ints would be same every time, I would suggest an object.

Something like this:

public class MyIntListObject
{
    public List<int> Output1 {get;set;}
    public List<int> Output2 {get;set;}
}

to hold your lists. I would suggest it for maintaineablity.

Youre method would turn into something like this:

static public MyIntListObject DoSomething (List<int> Allnums)
{

//My calculations

}

Upvotes: 1

Emond
Emond

Reputation: 50672

This is perfectly possible:

static public void DoSomething (List<List<int>> Allnums)
{

//My calculations

}

Notice that there is no reason to return a List; the argument points to the original list of lists. You'd have to put all the lists in a list first though:

List<List<int>> allLists = new List<List<int>>();
allLists.Add(Nums1);
allLists.Add(Nums2);
allLists.Add(Nums3);

DoSomething(allLists);

Upvotes: 1

SamFisher83
SamFisher83

Reputation: 3995

static public List<int> DoSomething (List<int> Allnums)
{

//My calculations

}

should be 

static public List<int> DoSomething (List<List <int>> Allnums)
{

//My calculations

}

Upvotes: 0

Related Questions