Loop through the tree

[Julia Shah]

Hi,

I have a treeview that shows folders and documents. For each folder I have the number of child folders and child documents (one level down). How can I loop through the tree and calculate the total number of sub-folders and documents for each node?

For example, this is what I have:

Root (folders: 2, docs: 0)
        Folder 1 (folders: 2, docs: 1)
                Folder 2 (folders: 0, docs: 0)
                Folder 3 (folders: 0, docs: 1)
                        Document1.txt
                Document2.txt
        Folder 4 (folders: 0, docs: 2)
                Document2.txt
                Document3.txt

And this is what I need:

Root (folders: 4, docs: 4)
        Folder 1 (folders: 2, docs: 2)
                Folder 2 (folders: 0, docs: 0)
                Folder 3 (folders: 0, docs: 1)
        Folder 4 (folders: 0, docs: 2)

Thank you,
Julia

[Atanas Korchev]

Hi Julia Shah,

You can use the Nodes property to obtain the immediate child nodes of a particular node. You could use it to traverse a particular node and calculate the total number of folders. You also need to use recursion in order to go deeper than the immediate child nodes. Here is a quick code snippet

public int CalculateSubFolders(RadTreeNode parent)
{
       int result = 0;

       foreach (RadTreeNode child in parent.Nodes)
      {
              if (IsFolder(child)) // This method determines if a node is a folder
             {
                   result ++; // increment for the "child" node
                   result += CalculateSubFolders(child); //add the number of folders in the child node.
             }
      }
       return result;
}

Regards,
Albert
the Telerik team

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