Find a node in Tree Structure [Answered]RSS

• • Reply
  Shan kHAN

  Member

  9 Points

  26 Posts

  Find a node in Tree Structure

  Jun 06, 2018 04:03 AM|Shan kHAN|LINK

  Hi All,

  i have a tree structure based on following class

  public class mynode
  {
      public string id  
      {
          get;
          set;
      }      
      public string text 
      {
          get;
          set;
      }
  
     public List<mynode> children; 
  
  }
  
  
  

  now in order to update or add child to a node, first i would need to find that node based on  node id in my tree object

      List<mynode> mytree = new List<mynode>();

  how i can find a specific node based on id, as there could be children and their children on many levels, like a tree 

  for normal list of objects i used the following

  int i = mytree .FindIndex(
  delegate (mynode temp)
  {
  return temp.id.Equals(given_id);
  });

  but here each object in the list further contains children,

  please give me any solution

  Thanks

• • Reply
  vahid bakkhi

  Star

  8089 Points

  2778 Posts

  Re: Find a node in Tree Structure

  Jun 06, 2018 07:18 AM|vahid bakkhi|LINK

  hi

  you have to write a recursive method below like :

  for example your tree is below like :

  id      text

  1     note1

   ------------->1-1   1-note1

  --------------------------------->1-1-1   1-1-note1

  --------------------------------->1-1-2   1-1-note2

   ------------->1-2   1-note2

  --------------------------------->1-2-1   1-2-note1

  --------------------------------->1-2-2   1-2-note2

  mynode mytree=new mynode()
              {
                  id = "1",
                  text = "note1",
                  children = new List<mynode>()
                  {
                      new mynode(){id = "1-1" , text = "1-note1" , 
                          children = new List<mynode>()
                      {
                          new mynode(){id = "1-1-1" ,text = "1-1-note1"},
                          new mynode(){id = "1-1-2" ,text = "1-1-note2"},
                      }},
                       new mynode(){id = "1-2" , text = "1-note2" , 
                          children = new List<mynode>()
                      {
                          new mynode(){id = "1-2-1" ,text = "1-2-note1"},
                          new mynode(){id = "1-2-2" ,text = "1-2-note2"},
                      }},
                  }
              };

  now you want to find id "1-1-2"

             var row = GetTree(mytree, "1-1-2");
              if (row != null)
              {
                  Response.Write(row.id + " " + row.text );
              }

  and your method

  public mynode GetTree(mynode node, string id)
          {
              if (node.id == id)
                  return node;
              else
              {
                  if (node.children != null)
                  {
                      foreach (var mynode in node.children)
                      {
                          var result= GetTree(mynode, id);
                          if (result != null)
                              return result;
                      }
                  }
              } 
  
              return null;
  
          }

  I hope it can be helpful

  vahid bakhtiary
  
  Please MARK AS ANSWER if suggestion helps.
• • Reply
  Shan kHAN

  Member

  9 Points

  26 Posts

  Re: Find a node in Tree Structure

  Jun 06, 2018 03:12 PM|Shan kHAN|LINK

  Thanks Vahid bakkahi,

  it worked for me, i really appreciate the way you given the solution in complete detail with the code