Questions on UI for WinForms Forum

1 answer

552 views

Hi,

I have an RadDropDownList filled with some items using DataSource and bounded functionality.
When I in the SelectedIndexChanged event tries to reset the selectedvalue to the original (the one before i changed), the control simply wont listen to my commands ;)

This is the code I use in the SelectedIndexChanged event:

void AgreementRadDropDownSelectedIndexChanged(object sender, Telerik.WinControls.UI.Data.PositionChangedEventArgs e)

{

if (_init || _selectedAgreement == (int)AgreementRadDropDown.SelectedValue) return;

if (MessageBox.Show("Do you want to change the agreement?", "Change Agreement", MessageBoxButtons.YesNo,MessageBoxIcon.Question) == DialogResult.No)

{

AgreementRadDropDown.SelectedValue = _selectedAgreement;

return;

}

_selectedAgreement = (int)AgreementRadDropDown.SelectedValue;

}

The rest of the code of the form is here:

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Windows.Forms;

using Telerik.WinControls.UI;

namespace TestDropDownList

{

public partial class Form1 : Form

{

private readonly IList<Agreement> _agreements = new List<Agreement>();

private int _selectedAgreement;

private readonly bool _init = false;

public Form1()

{

_init = true;

InitializeComponent();

AgreementRadDropDown.ItemDataBound += AgreementRadDropDownItemDataBound;

AgreementRadDropDown.SelectedIndexChanged += AgreementRadDropDownSelectedIndexChanged;

LoadAgreements();

_selectedAgreement = 2;

AgreementRadDropDown.SuspendUpdate();

AgreementRadDropDown.DisplayMember = "Name";

AgreementRadDropDown.ValueMember = "Id";

AgreementRadDropDown.DataSource = _agreements;

AgreementRadDropDown.SelectedValue = _selectedAgreement;

AgreementRadDropDown.ResumeUpdate();

_init = false;

}

void AgreementRadDropDownSelectedIndexChanged(object sender, Telerik.WinControls.UI.Data.PositionChangedEventArgs e)

{

if (_init || _selectedAgreement == (int)AgreementRadDropDown.SelectedValue) return;

if (MessageBox.Show("Do you want to change the agreement?", "Change Agreement", MessageBoxButtons.YesNo,MessageBoxIcon.Question) == DialogResult.No)

{

AgreementRadDropDown.SelectedValue = _selectedAgreement;

return;

}

_selectedAgreement = (int)AgreementRadDropDown.SelectedValue;

}

private void LoadAgreements()

{

_agreements.Add(new Agreement(1, "Agreement1", Properties.Resources._lock));

_agreements.Add(new Agreement(2, "Agreement2", Properties.Resources._lock));

_agreements.Add(new Agreement(3, "Agreement3", Properties.Resources.lock_unlock));

_agreements.Add(new Agreement(4, "Agreement4", Properties.Resources._lock));

_agreements.Add(new Agreement(5, "Agreement5", Properties.Resources.lock_unlock));

_agreements.Add(new Agreement(6, "Agreement6", Properties.Resources._lock));

}

private void Form1_Load(object sender, EventArgs e)

{

}

static void AgreementRadDropDownItemDataBound(object sender, ListItemDataBoundEventArgs args)

{

var item = args.NewItem.DataBoundItem as Agreement;

if (item != null)

args.NewItem.Image = item.StatusImage;

}

public class Agreement

{

public int Id { get; set; }

public string Name { get; set; }

public Image StatusImage { get; set; }

public Agreement(int id, string name, Image statusImage)

{

Id = id;

Name = name;

StatusImage = statusImage;

}

namespace TestDropDownList

{

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.AgreementRadDropDown = new Telerik.WinControls.UI.RadDropDownList();

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

this.SuspendLayout();

//

// AgreementRadDropDown

//

this.AgreementRadDropDown.DropDownAnimationEnabled = true;

this.AgreementRadDropDown.Location = new System.Drawing.Point(48, 37);

this.AgreementRadDropDown.Name = "AgreementRadDropDown";

this.AgreementRadDropDown.ShowImageInEditorArea = true;

this.AgreementRadDropDown.Size = new System.Drawing.Size(222, 20);

this.AgreementRadDropDown.TabIndex = 0;

this.AgreementRadDropDown.Text = "radDropDownList1";

//

// Form1

//

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

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

this.ClientSize = new System.Drawing.Size(318, 167);

this.Controls.Add(this.AgreementRadDropDown);

this.Name = "Form1";

this.Text = "Form1";

this.Load += new System.EventHandler(this.Form1_Load);

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

this.ResumeLayout(false);

this.PerformLayout();

}

#endregion

private Telerik.WinControls.UI.RadDropDownList AgreementRadDropDown;

}

I use two images in my project.. they are attached here and need to be added to the resource file of the project to make this look like the one i have here :)

What am i doing wrong?

Regards
Svein Thomas

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