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Binding with BindingList

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Treeview

This is a migrated thread and some comments may be shown as answers.

6 Answers, 1 is accepted

answered on 08 Feb 2011, 06:43 PM

Richard, I did take a look at that forum post the other day, and I am doing what is written on that post as far as databinding the TreeView to a BindingList, the TreeView is loaded with the correct data, but my problem comes in when I want to update a particular node. If I want to change the parent of a particular node, the treeview does not automatically update. What I am doing for now as a work-around is setting the datasource of the treeview to NULL then rebinding the control to the BindingList. I will try to create a sample project that demostrates this behavior this evening.

Accepted

answered on 08 Feb 2011, 08:21 PM

Hi Patrick,

BindingSource.ResetBindings() also has the desired effect.

Designer File

namespace RadTreeView_C

{

partial class Form1

{

/// <summary>

/// Required designer variable.

/// </summary>

private System.ComponentModel.IContainer components = null;

/// <summary>

/// Clean up any resources being used.

/// </summary>

/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>

protected override void Dispose(bool disposing)

{

if (disposing && (components != null))

{

components.Dispose();

}

base.Dispose(disposing);

}

#region Windows Form Designer generated code

/// <summary>

/// Required method for Designer support - do not modify

/// the contents of this method with the code editor.

/// </summary>

private void InitializeComponent()

{

this.radButton1 = new Telerik.WinControls.UI.RadButton();

this.radTreeView1 = new Telerik.WinControls.UI.RadTreeView();

((System.ComponentModel.ISupportInitialize)(this.radButton1)).BeginInit();

((System.ComponentModel.ISupportInitialize)(this)).BeginInit();

((System.ComponentModel.ISupportInitialize)(this.radTreeView1)).BeginInit();

this.SuspendLayout();

//

// radButton1

//

this.radButton1.Location = new System.Drawing.Point(244, 276);

this.radButton1.Name = "radButton1";

this.radButton1.Size = new System.Drawing.Size(130, 24);

this.radButton1.TabIndex = 1;

this.radButton1.Text = "radButton1";

this.radButton1.Click += new System.EventHandler(this.radButton1_Click);

//

// Form1

//

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.BackColor = System.Drawing.Color.DarkGray;

this.ClientSize = new System.Drawing.Size(386, 319);

//

// radTreeView1

//

this.radTreeView1.BackColor = System.Drawing.SystemColors.Window;

this.radTreeView1.Cursor = System.Windows.Forms.Cursors.Default;

this.radTreeView1.Font = new System.Drawing.Font("Segoe UI", 8.25F);

this.radTreeView1.ForeColor = System.Drawing.Color.Black;

this.radTreeView1.Location = new System.Drawing.Point(12, 12);

this.radTreeView1.Name = "radTreeView1";

this.radTreeView1.RightToLeft = System.Windows.Forms.RightToLeft.No;

//

this.radTreeView1.RootElement.ForeColor = System.Drawing.Color.Black;

this.radTreeView1.Size = new System.Drawing.Size(362, 250);

this.radTreeView1.TabIndex = 0;

this.radTreeView1.Text = "radTreeView1";

this.Controls.Add(this.radButton1);

this.Controls.Add(this.radTreeView1);

this.MinimizeBox = false;

this.Name = "Form1";

//

this.RootElement.ApplyShapeToControl = true;

this.Text = "Form1";

this.ThemeName = "Windows7";

((System.ComponentModel.ISupportInitialize)(this.radButton1)).EndInit();

((System.ComponentModel.ISupportInitialize)(this.radTreeView1)).EndInit();

((System.ComponentModel.ISupportInitialize)(this)).EndInit();

this.ResumeLayout(false);

}

#endregion

private Telerik.WinControls.UI.RadTreeView radTreeView1;

private Telerik.WinControls.UI.RadButton radButton1;

}

Form1.cs

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using Telerik.WinControls.UI;

using System.Collections.ObjectModel;

using System.Runtime.InteropServices;

namespace RadTreeView_C

{

public partial class Form1 : RadForm

{

BindingList<Person> people;

public Form1()

{

InitializeComponent();

this.people = new BindingList<Person>();

this.people.Add(new Person(1, 0, "Peter"));

this.people.Add(new Person(2, 0, "Stefan"));

this.people.Add(new Person(3, 1, "John"));

this.people.Add(new Person(4, 2, "James"));

this.people.Add(new Person(5, 4, "Ivan"));

this.radTreeView1.DataSource = this.people;

this.radTreeView1.ValueMember = "Id";

this.radTreeView1.DisplayMember = "Name";

this.radTreeView1.ParentIDMember = "ParentId";

this.radTreeView1.AllowEdit = true;

this.radTreeView1.AllowDefaultContextMenu = true;

this.radTreeView1.ExpandAll();

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void radButton1_Click(object sender, EventArgs e)

{

Person john = (Person)this.radTreeView1.Nodes[0].Nodes[0].DataBoundItem;

john.ParentId = 2; // move john to under stefan

people.ResetBindings();

this.radTreeView1.ExpandAll();

}

public class Person

{

string name;

int id;

int parentId;

public Person()

{

}

public Person(int id, int parentId, string name)

{

this.id = id;

this.parentId = parentId;

this.name = name;

}

public string Name

{

get { return name; }

set { name = value; }

}

public int Id

{

get { return id; }

set { id = value; }

}

public int ParentId

{

get { return parentId; }

set { parentId = value; }

}

Hope that helps
Richard