Creating an event for a component.
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;
public class CompoundControl : System.Windows.Forms.UserControl {
public delegate Boolean ValueChangedEventHandler(int nValue);
private System.Windows.Forms.Label label1;
private System.Windows.Forms.ComboBox comboBox1;
public event ValueChangedEventHandler Changed;
public CompoundControl() {
this.comboBox1 = new System.Windows.Forms.ComboBox();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
this.comboBox1.DropDownWidth = 121;
this.comboBox1.Items.AddRange(new object[] {"A","B","C","F","G","N"});
this.comboBox1.Location = new System.Drawing.Point(24, 48);
this.comboBox1.Size = new System.Drawing.Size(200, 21);
this.comboBox1.Text = "comboBox1";
this.comboBox1.SelectedIndexChanged += new System.EventHandler(this.OnSelectionIndexChange);
this.label1.Location = new System.Drawing.Point(16, 24);
this.label1.Text = "Select An Entry";
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.comboBox1,
this.label1});
this.Size = new System.Drawing.Size(240, 96);
this.ResumeLayout(false);
}
private void OnSelectionIndexChange(object sender,
System.EventArgs e) {
if (Changed != null)
Changed(this.comboBox1.SelectedIndex);
}
}
public class Form1 : System.Windows.Forms.Form {
private System.ComponentModel.Container components = null;
private CompoundControl compoundcomponent1 = null;
public Form1() {
this.compoundcomponent1 = new CompoundControl();
this.compoundcomponent1.Location = new System.Drawing.Point(24, 50);
this.compoundcomponent1.Name = "compound1";
this.compoundcomponent1.Size = new System.Drawing.Size(250, 100);
this.compoundcomponent1.Changed += new CompoundControl.ValueChangedEventHandler(OnChanged);
this.components = new System.ComponentModel.Container();
this.Size = new System.Drawing.Size(300, 300);
this.Controls.AddRange(new System.Windows.Forms.Control[]{this.compoundcomponent1,});
}
private bool OnChanged(int nIndex) {
MessageBox.Show(this, "New Index!" + nIndex);
return true;
}
[STAThread]
static void Main() {
Application.Run(new Form1());
}
}
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