Multidimensional Lists in C

Question

At the moment I am using one list to store one part of my data  and it s working perfectly in this format       Item ---------------- Joe Bloggs George Forman Peter Pan   Now  I would like to add another line to this list  for it to work like so   NAME                    EMAIL ------------------------------------------------------ Joe Bloggs              joe bloggs com George Forman           george formangrills co Peter Pan               me neverland com   I ve tried using this code to create a list within a list  and this code is used in another method in a foreach loop      Where List is instantiated List lt List lt string gt  gt  list2d   new List lt List lt string gt  gt           Where DataGrid instance is given the list dg DataSource   list2d  dg DataBind              In another method  where all people add their names and emails  then are added    to the two-dimensional list foreach  People p in ppl results        list Add results name       list Add results email       list2d Add list       When I run this  I get this result   Capacity Count  ---------------- 16       16  16       16  16       16                Where am I going wrong here  How can I get the output I desire with the code I am using right now

User · Answer

Where does the variable results come from?

This block:

foreach (People p in ppl.results) {
    list.Add(results.name);
    list.Add(results.email);
    list2d.Add(list);
}

Should probably read more like:

foreach (People p in ppl.results) {
    var list = new List<string>();
    list.Add(p.name);
    list.Add(p.email);
    list2d.Add(list);
}

User · Answer

Highly recommend something more like this   public class Person       public string Name  get  set       public string Email  get  set      var people   new List lt Person gt       Easier to read  easy to code

User · Answer

It s old but thought I d add my two cents    Not sure if it will work but try using a KeyValuePair    List lt KeyValuePair lt      gt  gt  LinkList   new List lt KeyValuePair lt      gt  gt      LinkList Add new KeyValuePair lt      gt  Object  Object      You ll end up with something like this    LinkList 0     lt Object  Object gt   LinkList 1     lt Object  Object gt   LinkList 2     lt Object  Object gt    and so on

User · Answer

Why don t you use a List lt People gt  instead of a List lt List lt string gt  gt

User · Answer

Please show more of your code   If that last piece of code declares and initializes the list variable outside the loop you re basically reusing the same list object  thus adding everything into one list   Also show where  Capacity and  Count comes into play  how did you get those values

User · Answer

If for some reason you don t want to define a Person class and use List lt Person gt  as advised  you can use a tuple  such as  C  7    var people   new List lt  string Name  string Email  gt        Joe Bloggs    joe bloggs com        George Forman    george formangrills co        Peter Pan    me neverland com       var georgeEmail   people 1  Email    The Name and Email member names are optional  you can omit them and access them using Item1 and Item2 respectively   There are defined tuples for up to 8 members   For earlier versions of C   you can still use a List lt Tuple lt string  string gt  gt   or preferably ValueTuple using this NuGet package   but you won t benefit from customized member names

User · Answer

You should use List lt Person gt  or a HashSet lt Person gt

[c#] Multidimensional Lists in C#

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