Sorting child nodes of a treeview after populating the treeview in c# winforms

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I am having trouble sorting child nodes of a treeview in my winforms program. My treeview is populated by some XML files and it uses an internal text inside the xml files as Text property of nodes (So I think I cant sort them before adding them to the tree view, or if it is possible, since the xml files are big in size I dont want to waste the process). A populated treeview in my program looks like this:

As you can guess I want child nodes to sort like (I dont want HBM\D10 to come after HBM\D1) rather I want:

    HBM\D1
    HBM\D2
    HBM\D3
etc...

I have already tried treeView1.Sort() and also adding beginUpdate and endUpdate but I had no suceess :(

I am using .NET 4, any tips would be appriciated

ok I sortet it out using Thomas's advice:

    class NodeSorter : IComparer
{
        public int Compare(object x, object y) 
        {         
            TreeNode tx = (TreeNode)x; 
            TreeNode ty = (TreeNode)y;

            if (tx.Text.Length < ty.Text.Length)
            {
                return -1;
            }

            if (tx.Text.Length > ty.Text.Length)
            {
                return 1;
            }

            return 0;
        } 
}

You need to create a custom comparer and assign it to the TreeViewNodeSorter property:

public class NodeSorter : System.Collections.IComparer
{
    public int Compare(object x, object y)
    {
        TreeNode tx = (TreeNode)x;
        TreeNode ty = (TreeNode)y;

        // Your sorting logic here... return -1 if tx < ty, 1 if tx > ty, 0 otherwise
        ...
    }
}


...

treeView.TreeViewNodeSorter = new NodeSorter();
treeView.Sort();

TreeView.Sort Method (System.Windows.Forms), Remarks. This method reapplies the default sort, which is alphabetical by node text, or a custom sort specified by the TreeViewNodeSorter property. You can use � Examples. The following code example demonstrates how to use the TreeViewNodeSorter property to sort nodes from smallest to largest. To run this example, paste the following code into a Windows Form and call InitializeTreeView1 from the form's constructor or Load event handler.

You're using alphabetic sorting, so D10 comes after D1. You should try to sort discarding "D" char and converting the rest of string to a number.

How-to-Sort-all-the-nodes-in-the-TreeViewAdv-control , SortWithChildNodes, This indicates the sorting of all nodes including child nodes the user can sort all the nodes including the child nodes in the TreeViewAdv. public void Sort (); member this.Sort : unit -> unit Public Sub Sort Remarks. This method reapplies the default sort, which is alphabetical by node text, or a custom sort specified by the TreeViewNodeSorter property. You can use this method if the text of existing nodes is changed or nodes are moved by the user, and you want to sort the items

I've written some custom comparers to make creating the comparer you need here somewhat easier to do: MultiComparer and ProjectionComparer. Together, you could create a comparer to sort what you need on the fly without having to create a class by hand. What I provide here isn't actually how I have the classes written, I trimmed off a lot of code for brevity (though left some helpers to be easier to use).

To create the comparer:

var comparer = OrderedComparer.Create(
    ProjectionComparer.Create((TreeNode tn) => tn.Text.Substring(0, 1)),
    ProjectionComparer.Create((TreeNode tn) => Convert.ToInt32(tn.Text.Substring(1)))
);
treeView.TreeViewNodeSorter = comparer;

And the classes:

public static class OrderedComparer
{
    public static OrderedComparer<TSource> Create<TSource>(params IComparer<TSource>[] comparers)
    { return new OrderedComparer<TSource>(comparers); }
}
public static class ProjectionComparer
{
    public static ProjectionComparer<TSource, TKey> Create<TSource, TKey>(Func<TSource, TKey> keySelector)
    { return new ProjectionComparer<TSource, TKey>(keySelector); }
}
public sealed class OrderedComparer<TSource> : Comparer<TSource>
{
    public OrderedComparer(params IComparer<TSource>[] comparers)
    {
        this.comparers = comparers.ToArray();
    }
    private IComparer<TSource>[] comparers;

    public override int Compare(TSource x, TSource y)
    {
        var cmp = 0;
        foreach (var comparer in comparers)
            if ((cmp = comparer.Compare(x, y)) != 0)
                break;
        return cmp;
    }
}
public sealed class ProjectionComparer<TSource, TKey> : Comparer<TSource>
{
    public ProjectionComparer(Func<TSource, TKey> keySelector)
    {
        this.keySelector = keySelector;
        this.keyComparer = Comparer<TKey>.Default;
    }
    private Func<TSource, TKey> keySelector;
    private IComparer<TKey> keyComparer;

    public override int Compare(TSource x, TSource y)
    {
        var xKey = keySelector(x);
        var yKey = keySelector(y);
        return keyComparer.Compare(xKey, yKey);
    }
}

How to sort child nodes of a node. in UI for WinForms Treeview , Member since: How can I sort the child nodes of a particular node? You can do that by using custom sorting and creating a custom node� The root tree nodes display customer names, and the child tree nodes display the order numbers assigned to each customer. In this example, 1,000 customers are displayed with 15 orders each. The repainting of the TreeView is suppressed by using the BeginUpdate and EndUpdate methods, and a wait Cursor is displayed while the TreeView creates and

Following is the solution I have used in my current project.

public class NodeSorter : IComparer
{
   public int Compare(object x, object y)
   {
      TreeNode tx = x as TreeNode;
      TreeNode ty = y as TreeNode;
      if (tx.Name== null || ty.Name== null)
         return 0;
      return (-1) * string.Compare(tx.Name.ToString(), ty.Name.ToString());
   }
} 

tvListofItems.TreeViewNodeSorter = new NodeSorter();
tvListofItems.Sort();              

Vba treeview add node, Add Treeview Node : Object reference not set to an instance of an object I'm trying to 2 days ago � Rate this: Enable form elements after selecting searchable net treeview add child node,treeview c#,how to add The Treeview Control holds NET developers about TreeView in Syncfusion WinForms components: How do� TreeView control is used to represent hierarchical data using expandable nodes. TreeView control is available in WinForms and WPF as well. This article will guide you to “How to populate and add new nodes to TreeView up-to-N Levels from Database”.

A simple TreeView example, We start off the TreeView chapter with a simple example, where we define the items the TreeView control and its child objects are also child tags to its parent object. To specify the text we want displayed for each node, we use theHeader property. a lot more flexibility than you could ever get from the WinForms TreeView. Hi jmgreen7, If you don't want to specify the node level,you can do as follows: First: set some nodes in several levels, Second: set each node a tag with a number, Third: add a ContextMenuStrip with one item:sort,and set the contextMenuStrip property of the treeview to it.

WPF TreeView bound to ObservableCollection not updating root , I have a WPF TreeView that is bound to a hierarchy of a single type: Sorting child nodes of a treeview after populating the treeview in c# winforms � Difference � The following code example demonstrates how to enable drag-and-drop operations within a TreeView control. In this example, any node can be dragged to another node that is not a descendant of the dragged node. The dragged node, which includes all its descendant nodes, becomes a child of the destination node.

Vb net treeview add child node, When you set the Sorted property of a node to True, every child node you attach to it I value tag node net how existing child all c# winforms treeview treenode The former changes the node hierarchy and the later changes the node order. which I have connected to an Access Database and populates the treeview to on � Your solution cannot meet one requirement - I need to add/insert new node to any where (parent level and child level), and change their caption as well. when I add/insert new node to parent level, it always be inserted at position 0. I cannot append it to the end, or insert it in the middle.

Comments
  • Thanks, would you mind giving a bit more about the logic part? is it about converting nodes to binary or something?
  • @Sean87, you need to sort by the text of the TreeNode according to your own logic, i.e. extract the number part of the text, and compare by number if the rest of the name is equal
  • In order for this to work on .net 4(Windows 8) I had to make it inherit from Comparer<TreeNode> and implement the Compare as public override int Compare(TreeNode Node1, TreeNode Node2)
  • @ThunderGr, there is no reason to do that. Even in .NET 4.5, the TreeViewNodeSorter property is till of type IComparer, not IComparer<T>. I suspect you were just missing a namespace import... The code I posted works with .NET 4.x in the same way as with earlier versions.
  • @ThunderGr, I fixed the code to specify the namespace explicitly
  • Updated to more recent version of the code (still somewhat trimmed).