Multiple ValueMembers

[Ryan]

Hello,

I have a bound RadTreeView that has its datasource set to a datatable. I've set the DisplayMember and ValueMember of the RadTreeView, but now I would like to bind some additional fields to the tree.

I understand that I can create a new class for the RadTreeNode (or just use the Tag property if I only needed one new value) and give it some additional properties, but how can I bind these new properties in the same manner that setting the ValueMember does? My class currently looks like this:

Public Class MyRadTreeNode
    Inherits RadTreeNode

    Private _Value1 As String
    Private _Value2 As String

    Public Property Value1 As String
        Get
            Return _Value1
        End Get
        Set(value As String)
            _Value1 = Value1
        End Set
    End Property

    Public Property Value2 As String
        Get
            Return _Value2
        End Get
        Set(value As String)
            _Value2 = Value2
        End Set
    End Property
End Class

 

If this is not possible, could anyone recommend a workaround? I was looking at just looping through the tree's datasource, but since neither the DisplayMember nor the ValueMember are set to primary key columns, I don't believe this would be possible. I could change the ValueMember to a primary key but I'd like to avoid doing that if at all possible (I'm assuming I would take a pretty big performance hit if I did this).

Thanks in advance!

[Ryan]

Those properties don't make any sense... it should say _Value1 = value, _Value2 = value... typo!

[Hristo]

Hello Ryan,

Thank you for writing.

Indeed, storing this information in the Tag property of the node is a possible solution. Alternatively, you can also achieve the same result by using a custom RadTreeNode, having a property of your choice. Depending on your scenario you can set the value of this field from the data table or from a different source if needed. Please check my code snippet below: 

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        this.radTreeView1.CreateNode += radTreeView1_CreateNode;
        this.radTreeView1.NodeDataBound += radTreeView1_NodeDataBound;

        this.radTreeView1.DataSource = GetTable();
        this.radTreeView1.DisplayMember = "Name";
        this.radTreeView1.ParentMember = "ParentId";
        this.radTreeView1.ChildMember = "Id";
        this.radTreeView1.ValueMember = "Id";

        this.radTreeView1.ShowLines = true;
        this.radTreeView1.ExpandAll();
    }

    private void radTreeView1_CreateNode(object sender, CreateTreeNodeEventArgs e)
    {
        e.Node = new MyRadTreeNode();
    }

    private void radTreeView1_NodeDataBound(object sender, RadTreeViewEventArgs e)
    {
        MyRadTreeNode node = (MyRadTreeNode)e.Node;
        node.Description = ((DataRowView)node.DataBoundItem).Row["Description"].ToString();
    }

    public DataTable GetTable()
    {
        DataTable table = new DataTable();
        table.Columns.Add("Id", typeof(int));
        table.Columns.Add("Name", typeof(string));
        table.Columns.Add("ParentId", typeof(int));
        table.Columns.Add("Description", typeof(string));

        table.Rows.Add(1, "Parent 1", 0, "Parent Description");
        table.Rows.Add(2, "Parent 2", 0, "Parent Description");
        table.Rows.Add(3, "Parent 3", 0, "Parent Description");
        table.Rows.Add(4, "Parent 4", 0, "Parent Description");

        table.Rows.Add(5, "Child 1", 1, "Child Description");
        table.Rows.Add(6, "Child 2", 1, "Child Description");
        table.Rows.Add(7, "Child 3", 3, "Child Description");
        table.Rows.Add(8, "Child 4", 4, "Child Description");

        return table;
    }
}

public class MyRadTreeNode : RadTreeNode
{
    private string description;

    public string Description
    {
        get { return this.description; }
        set { this.description = value; }
    }
}

I hope this helps. Should you have further questions please do not hesitate to write back.

Regards,
Hristo Merdjanov
Telerik

[Ryan]

Hristo,

Thank you - this is exactly what I was looking for!