Are 2 dimensional Lists possible in c

Question

I d like to set up a multidimensional list  For reference  I am working on a playlist analyzer   I have a file file-list  which my program saves in a standard list  One line from the file in each list entry   I then analyze the list with regular-expressions to find specific lines  Some of the data results from the lines needs to be put into a new multidimensional list  since I don t know how many results data I ll end up with  I can t use a multidimensional array   Here is the data I want to insert    List        0     List                        0     Track ID              1     Name              2     Artist              3     Album              4     Play Count              5     Skip Count                 1     List           And so on       Real Example    List        0     List                        0     2349              1     The Prime Time of Your Life              2     Daft Punk              3     Human After All              4     3              5     2                 1     List             So yeah  mlist 0  0  would get TrackID from song 1  mlist 1  0  from song 2 etc   But I am having huge issues creating a multidimensional list  So far I have come up with   List lt List lt string gt  gt  matrix   new List lt List lt string gt  gt       But I haven t really had much more progress

User · Accepted Answer

Well you certainly can use a List lt List lt string gt  gt  where you d then write   List lt string gt  track   new List lt string gt     track Add  2349    track Add  The Prime Time of Your Life       etc matrix Add track     But why would you do that instead of building your own class to represent a track  with Track ID  Name  Artist  Album  Play Count and Skip Count properties  Then just have a List lt Track gt

User · Answer

Here is how to make a 2 dimensional list             Generating lists in a loop          List lt List lt string gt  gt  biglist   new List lt List lt string gt  gt              for int i   1  i  lt   10  i                          List lt string gt  list1   new List lt string gt                 biglist Add list1                         Populating the lists         for  int i   0  i  lt  10  i                          for int j   0  j  lt  10  j                                  biglist i  Add  i  ToString           j ToString                                      textbox1 Text   biglist 5  9      n     Be aware of the danger of accessing a location that is not populated

User · Answer

Here s a little something that I made a while ago for a game engine I was working on  It was used as a local object variable holder  Basically  you use it as a normal list  but it holds the value at the position of what ever the string name is or ID   A bit of modification  and you will have your 2D list   using System  using System Collections Generic  using System Linq  using System Text   namespace GameEngineInterpreter       public class VariableList lt T gt                private List lt string gt  list1          private List lt T gt  list2                lt summary gt              Initialize a new Variable List              lt  summary gt          public VariableList                         list1   new List lt string gt                 list2   new List lt T gt                             lt summary gt              Set the value of a variable  If the variable does not exist  then it is created              lt  summary gt               lt param name  variable  gt Name or ID of the variable lt  param gt               lt param name  value  gt The value of the variable lt  param gt          public void Set string variable  T value                        if   list1 Contains variable                                 list1 Add variable                   list2 Add value                             else                               list2 list1 IndexOf variable     value                                        lt summary gt              Remove the variable if it exists              lt  summary gt               lt param name  variable  gt Name or ID of the variable lt  param gt          public void Remove string variable                        if  list1 Contains variable                                 list2 RemoveAt list1 IndexOf variable                    list1 RemoveAt list1 IndexOf variable                                          lt summary gt              Clears the variable list              lt  summary gt          public void Clear                         list1 Clear                list2 Clear                            lt summary gt              Get the value of the variable if it exists              lt  summary gt               lt param name  variable  gt Name or ID of the variable lt  param gt               lt returns gt Value lt  returns gt          public T Get string variable                        if  list1 Contains variable                                 return  list2 list1 IndexOf variable                               else                               return default T                                         lt summary gt              Get a string list of all the variables               lt  summary gt               lt returns gt List string lt  string gt  lt  returns gt          public List lt string gt  GetList                         return  list1

User · Answer

As Jon Skeet mentioned you can do it with a List lt Track gt  instead  The Track class would look something like this   public class Track       public int TrackID   get  set        public string Name   get  set        public string Artist   get  set        public string Album   get  set        public int PlayCount   get  set        public int SkipCount   get  set        And to create a track list as a List lt Track gt  you simply do this   var trackList   new List lt Track gt       Adding tracks can be as simple as this   trackList add  new Track       TrackID   1234      Name    I m Gonna Be  500 Miles        Artist    The Proclaimers       Album    Finest       PlayCount   10      SkipCount   1       Accessing tracks can be done with the indexing operator   Track firstTrack   trackList 0     Hope this helps

User · Answer

another work around which i have used was     List lt int    gt  itemIDs   new List lt int   gt      itemIDs Add  new int 2    101  202        The library i m working on has a very formal class structure and i didn t wan t extra stuff in there effectively for the privilege of recording two  related  ints   Relies on the programmer entering only a 2 item array but as it s not a common item i think it works

User · Answer

I used   List lt List lt String gt  gt  List1   new List lt List lt String gt  gt  var List lt int gt    new List lt int gt     List add  Test    List add  Test2    List1 add List   var List lt int gt    new List lt int gt     List add  Test3    List1 add List     that equals   List1    0    gt  List2    List1 0  x                 0    gt  Test     List 0  0  etc           1    gt  Test2         1    gt  List2                0    gt  Test3

User · Answer

This is the easiest way i have found to do it   List lt List lt String gt  gt  matrix  new List lt List lt String gt  gt       Creates new nested List matrix Add new List lt String gt        Adds new sub List matrix 0  Add  2349      Add values to the sub List at index 0 matrix 0  Add  The Prime of Your Life    matrix 0  Add  Daft Punk    matrix 0  Add  Human After All    matrix 0  Add  3    matrix 0  Add  2      To retrieve values is even easier  string title   matrix 0  1     Retrieve value at index 1 from sub List at index 0

User · Answer

You can also use DataTable - you can define then the number of columns and their types and then add rows http   www dotnetperls com datatable

User · Answer

You can also  do in this way   List lt List lt Object gt  gt  Parent new  List lt List lt Object gt  gt      List lt Object gt  Child new List lt Object gt     child Add 2349   child Add  Daft Punk    child Add  Human        Parent Add child     if you need another item child   create a new instance of child   Child new List lt Object gt     child Add 2323   child Add  asds    child Add  jshds        Parent Add child

[c#] Are 2 dimensional Lists possible in c#?

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