Customize sorting of Treeview

I have a treeview that need to be sorted according to the tag of every node and also according to the alpha beta.

for example:

• Node1 , tag=A , text= Apple
• Node2, tag=B , text= Baloon
• Node3, tag=A, text= Help

I want to sort it, that nodes with tag A will be firsts, and just then nodes with tag B. but, i want the no开发者_C百科des that contains tag A, to be sorted from A to Z.

(the order = Node1,Node3,Node2)

please help me , How can i do it?

thanks in advance!

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Assuming you're talking about System.Windows.Forms.Treeview, you can use TreeViewNodeSorter and an implementation of IComparer to create a custom sorting strategy.

http://msdn.microsoft.com/en-us/library/system.windows.forms.treeview.treeviewnodesorter.aspx

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thanks! I did it like that:

 /// <summary>
        ///  Create a node sorter that implements the IComparer interface.
       /// </summary>
        public class NodeSorter : IComparer
        {
            // compare between two tree nodes
            public int Compare(object thisObj, object otherObj)
            {
                TreeNode thisNode = thisObj as TreeNode;
                TreeNode otherNode = otherObj as TreeNode;

                // Compare the types of the tags, returning the difference.
                if (thisNode.Tag is  first_type&& otherNode.Tag is another_type)
                    return 1;
                 //alphabetically sorting
                return thisNode.Text.CompareTo(otherNode.Text);
            }
        }