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Refreshing radTreeView with Bound List

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Treeview

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20 Answers, 1 is accepted

answered on 14 Jul 2008, 08:00 AM

Hi Brad,

You can "refresh" RadTreeView by resetting the data binding. That is - set the DataSource property to null and then set it again to your source.

Generally speaking, RadTreeView should add new nodes for the new items in the data source automatically. And if it doesn't you may have found a bug in the data binding that must be corrected. It will be most helpful if you can send us a sample project that demonstrates the issue. It could also be in help if you explain in more detail what is the data and how you bind RadTreeView to it.

Thank you for your cooperation.

Regards,
Jordan
the Telerik team

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answered on 15 Jul 2008, 10:14 PM

Hi Jordan,

Since having the problem with data binding I have reverted back to manually adding nodes. What I can tell you is that I tried binding the data source in the constructor and then tried binding it in my add node button click event. (Neither worked correctly at the time)

Code used to bind:
radTreeViewExplorer.DisplayMember = "Name";
radTreeViewExplorer.DataSource = projectPipes;

The object type that I am binding to List: (Generics)
private List<Pipe> projectPipes = new List<Pipe>();

The Pipe class is fairly simple consisting mostly of properties. One being "Name" which is what I linked to the display member. I also tried linking the Value member to "Name" as well; that had no effect.

Regards,
Brad

Accepted

answered on 20 Nov 2008, 12:12 PM

I there!

I've also a similar problem. I have a custom BindingList<T> implemented. It's a BindingList<MyObj>. I have my TreeView bound to it as such:

    
            rtvComponentes.Nodes.Clear(); 
        
            rtvComponentes.SelectedNode = null; 
        
            rtvComponentes.DisplayMember = "Designacao"; 
        
            rtvComponentes.ValueMember = "ID"; 
        
            rtvComponentes.ParentIDMember = "ID_Parent"; 
        
            rtvComponentes.DataSource = MyBOJ.ListObjs; // This is of type MyObjectList<Obj>, which in turn is a BindingList<T>

I do that once, then I had new objects to the MyBOJ.ListObjs collection. The tree stays the same. Is it because of the binding being to self-related data?

Thanks!

answered on 25 Nov 2008, 08:47 AM

RadTreeViewSelfRefData.zip

Hello Stargazer,

I was not able to reproduce any issue concerning the self-referencing data. I made a sample project which demonstrates that this scenario is working correctly on my side.

If your case is different, please open a new support ticket and send me a sample project. This will allow me to to address any potential issue further and to give you more accurate response.

Sincerely yours,
Nikolay
the Telerik team

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answered on 17 Feb 2009, 01:44 AM

Hi Sir,

I would like to ask if how I could refresh the rad treeview when new node is added or deleted and all other controls when I click the refresh button. Here's is my code in splash screen upon loading(radtreeview) to main form...

Thank you and God bless...

public void PopulateMessageTree()
        {
            radTreeMessages.BeginUpdate();

            foreach (var folder in collFolders.Where(x => x.ParentId == 0))
            {
                var node = new RadTreeNode(folder.Name) { ImageIndex = Constants.ICON_SMS_FOLDER, Tag = "ROOT", Key = folder.NodeId };
                radTreeMessages.Nodes.Add(node);

                FolderItem folder1 = folder;
                foreach (var smsFolder in collFolders.Where(x => x.ParentId == folder1.NodeId))
                {
                    var child = new RadTreeNode(smsFolder.Name) { ImageIndex = Constants.ICON_SMS, Tag = smsFolder.Name, Key = smsFolder.NodeId };
                    node.Nodes.Add(child);
                }
            }
            radTreeMessages.ExpandAll();
            radTreeMessages.EndUpdate();
        }// End of PopulateMessageTree

answered on 22 Mar 2010, 07:55 AM

Hi,
I use a list of custom object to bind to the treeview. I use OnLoadDemand for a particular node. When i click on the node, i call a wcf service method (asynch call.). After completeing event i get a new list of items and i add this list to the child list of the treeview item. At this stage, i want to refresh the treeview item which will show me the newly created child nodes. Can i achieve this using INotifyPropertyChanged interface? (I dont want to refresh the whole treeview. If i make the itemSource null and then bind it again i am able to get the newly created child nodes, but it makes the tree collapse. I dont want to make the tree collapse. ).

Please can anyone suggest me a good solution for this?

Regards.

answered on 21 Jul 2010, 05:14 PM

Hi.

I am also having same kind of problem. I have a RadTreeView, which is bound to a customized list class which is inherited from

BindingList

<T>. The problem is when I call bindingList.Add(myItem), it throws this exception "Value was either too large or too small for an Int32." Although, it doesn't give any exception on adding if the list is not bound.

This is how I am binding the tree:

private void BindTree()

{

this.treeView.DataSource = null;

this.treeView.DisplayMember = "SomeProperty";
this.treeView.ValueMember = "RecId";

this.treeView.ParentIDMember = "ChildOf";

this.treeView.DataSource = this.bindingList; //BindingList<Template>

this.treeView.DataMember = "Template";

}

Kindly tell me if I am doing any mistake?

Thanks,
Umair

answered on 26 Jul 2010, 04:19 PM

Hello Umair,

Thank you for writing.

For some reason an overflow or underflow exception is occurring, but I was not able to reproduce it. Please prepare a small sample application that triggers this exception, so that I can debug it and provide a solution.

Please note that you have to open a new support ticket in order to attach your project.

I am looking forward to your reply.

Sincerely yours,
Victor
the Telerik team

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answered on 25 Nov 2013, 09:12 AM

Hi Reza,

Thank you for writing.

If you bind the tree to a DataTable, than all changes you are doing will be "stacked" in the DataTable, and then you can push them back to the database by calling the Update method of the TableAdapter. More information is available here:

I hope this helps.

Regards,
Stefan
Telerik

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answered on 25 Sep 2015, 06:28 AM

Hi Christopher,

Thank you for writing.

Since all the nodes are getting collapsed, it seems the tree is updated/refreshed. If you know when this happens or what causes it, you can save the tree state (expanded nodes and scroll position) and restore it afterwards.

If you have issues achieving that, I would suggest that you open a support ticket, where you can attach your or a sample demonstrating the undesired . Once we have it, we will be able to investigate a look for a possible solution.

Regards,
Stefan
Telerik

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