ListBox.ValueMemberChanged : ListBox « System.Windows.Forms « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Windows.Forms
3. ListBox

ListBox.ValueMemberChanged

 


using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

public class Employee{

  public string ID;
  public string Name ;

  public  Employee(string strName, string strID)
  {
     this.ID = strID;
     this.Name = strName;
  }

  public override string ToString()
  {
     return this.ID + " : " + this.Name;
  }
}

public class Form1 : System.Windows.Forms.Form
{
  private System.Windows.Forms.GroupBox groupBox1;
  private System.Windows.Forms.RadioButton rbAuthors;
  private System.Windows.Forms.RadioButton rbEmployees;
  private System.Windows.Forms.ListBox lb;

  private DataTable dataTable;
    private ArrayList Employees = new ArrayList();

  private System.ComponentModel.Container components = null;

  public Form1()
  {
    InitializeComponent();

    lb.Items.Add("A");
    lb.Items.Add("B");
    lb.Items.Add("C");
    lb.Items.Add("D");
    lb.Items.Add("E");

    lb.SelectedIndex = 0;

    // populate the arraylist for later use.
        Employees.Add(new Employee("A", "1"));
        Employees.Add(new Employee("B", "2")); 
        Employees.Add(new Employee("C", "3"));
        Employees.Add(new Employee("D", "4"));
        Employees.Add(new Employee("E", "5"));
        Employees.Add(new Employee("F", "6"));
        Employees.Add(new Employee("G", "7"));
  }

  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }

  private void InitializeComponent()
  {
    this.lb = new System.Windows.Forms.ListBox();
    this.groupBox1 = new System.Windows.Forms.GroupBox();
    this.rbEmployees = new System.Windows.Forms.RadioButton();
    this.rbAuthors = new System.Windows.Forms.RadioButton();
    this.groupBox1.SuspendLayout();
    this.SuspendLayout();
    // 
    // lb
    // 
    this.lb.Location = new System.Drawing.Point(16, 8);
    this.lb.Name = "lb";
    this.lb.Size = new System.Drawing.Size(232, 212);
    this.lb.TabIndex = 0;
    this.lb.DisplayMemberChanged += new System.EventHandler(this.lb_DisplayMemberChanged);
    this.lb.ValueMemberChanged += new System.EventHandler(this.lb_ValueMemberChanged);
    this.lb.DataSourceChanged += new System.EventHandler(this.lb_DataSourceChanged);
    this.lb.SelectedValueChanged += new System.EventHandler(this.lb_SelectedValueChanged);
    this.lb.SelectedIndexChanged += new System.EventHandler(this.lb_SelectedIndexChanged);
    // 
    // groupBox1
    // 
    this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                    this.rbEmployees,
                                                    this.rbAuthors});
    this.groupBox1.Location = new System.Drawing.Point(16, 240);
    this.groupBox1.Name = "groupBox1";
    this.groupBox1.TabIndex = 1;
    this.groupBox1.TabStop = false;
    this.groupBox1.Text = "DataSource";
    // 
    // rbEmployees
    // 
    this.rbEmployees.Location = new System.Drawing.Point(24, 56);
    this.rbEmployees.Name = "rbEmployees";
    this.rbEmployees.TabIndex = 1;
    this.rbEmployees.Text = "Employee\'s";
    this.rbEmployees.CheckedChanged += new System.EventHandler(this.rb_CheckedChanged);
    // 
    // rbAuthors
    // 
    this.rbAuthors.Checked = true;
    this.rbAuthors.Location = new System.Drawing.Point(24, 32);
    this.rbAuthors.Name = "rbAuthors";
    this.rbAuthors.TabIndex = 0;
    this.rbAuthors.TabStop = true;
    this.rbAuthors.Text = "Authors";
    this.rbAuthors.CheckedChanged += new System.EventHandler(this.rb_CheckedChanged);
    // 
    // Form1
    // 
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(264, 389);
    this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                             this.groupBox1,
                                             this.lb});
    this.Name = "Form1";
    this.Text = "Form1";
    this.Load += new System.EventHandler(this.Form1_Load);
    this.groupBox1.ResumeLayout(false);
    this.ResumeLayout(false);

  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new Form1());
  }

  private void rb_CheckedChanged(object sender, System.EventArgs e)
  {
    lb.DataSource = Employees;
    lb.DisplayMember = "Name";
    lb.ValueMember = "ID";
  }

  private void lb_SelectedIndexChanged(object sender, System.EventArgs e)
  {
    MessageBox.Show(lb.SelectedIndex.ToString()+ "\n" + lb.GetItemText(lb.SelectedItem),"lb_SelectedIndexChanged");    
  }

  private void lb_SelectedValueChanged(object sender, System.EventArgs e)
  {
    MessageBox.Show(lb.GetItemText(lb.SelectedItem),"lb_SelectedValueChanged");    
  }

  private void lb_DataSourceChanged(object sender, System.EventArgs e)
  {
    MessageBox.Show(lb.DataSource.ToString(), "lb_DataSourceChanged");    
  }

  private void lb_DisplayMemberChanged(object sender, System.EventArgs e)
  {
    MessageBox.Show(lb.DisplayMember.ToString(), "lb_DisplayMemberChanged");    
  }

  private void lb_ValueMemberChanged(object sender, System.EventArgs e)
  {
    MessageBox.Show(lb.ValueMember.ToString(), "lb_ValueMemberChanged");    
  }

  private void Form1_Load(object sender, System.EventArgs e)
  {
    this.lb.SelectedValueChanged += new System.EventHandler(this.lb_SelectedValueChanged);
    this.lb.SelectedIndexChanged += new System.EventHandler(this.lb_SelectedIndexChanged);
  }
}

   
  

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