By ArunGG
Introduction:
The LinkLabel control exhibits links to other objects, such as files or Web pages. Class LinkLabel is derived from class Label and therefore inherits all of class Label’s functionality. A LinkLabel looks as underlined text. When the mouse moves above the link, the pointer modify to a hand. This is alike to the behavior of a hyperlink in a Web page. The link can change color to indicate whether the link is new, visited or active. When clicked, the LinkLabel generates a LinkClicked event.
Class LinkLabel :
Class LinkLabel is derived from class Label and therefore inherits all of
class Label’s functionality. Hand image displays when mouse moves over LinkLabel.
Some common Properties of LinkLabel:
ActiveLinkColor - Denotes the color of the active link when clicked. Default is red.
LinkColor - Denotes the original color of every links prior to they have been visited. Default is blue.
Links - Lists the LinkLabel Link objects, which are the links enclosed in the LinkLabel.
LinkVisited - If True, link appears as though it were visited (its color is changed to that specified by property VisitedLinkColor).
Text - Denotes the text to show on the control.
VisitedLinkColor - Denotes the color of visited links. Default is purple.
LinkArea - Denotes which part of text in the LinkLabel is treated as element of the link.
LinkBehavior - Denotes the link’s behavior, for example how the link come into view when the mouse is positioned over it.
LinkClicked - Generated when link is clicked.
Now let us see the usage of LinkLabel control with an example:
In this example I place a LinkLabel control with the text "To know C# - visit www.csharpheaven.com - Click Here!" and provide a link to a portion of the text. So that when clicked, the LinkLabel generates a LinkClicked event.
The Example:
using System;
using System.Drawing;
using System.ComponentModel;
using System.WinForms;
public class LinkLabel : System.WinForms.Form {
private System.WinForms.LinkLabel linkLabel1;
public LinkLabel() {
InitializeComponent();
}
public override void Dispose() {
base.Dispose();
}
public static void Main(string[] args) {
Application.Run(new LinkLabel());}
private void InitializeComponent()
{
this.linkLabel1 = new System.WinForms.LinkLabel();
linkLabel1.Text = "To know C# - visit www.csharpheaven.com - Click Here!";
linkLabel1.Size = new System.Drawing.Size(168, 56);
linkLabel1.LinkColor =
(System.Drawing.Color)System.Drawing.Color.FromARGB((byte)128,(byte)255, (byte)255);
linkLabel1.LinkArea = new System.Drawing.Point(42, 11);
linkLabel1.ForeColor = System.Drawing.Color.Maroon;
linkLabel1.Font = new System.Drawing.Font("Times New Roman", 10f,
System.Drawing.FontStyle.Bold);
linkLabel1.TabIndex = 0;
linkLabel1.TabStop = true;
linkLabel1.Location = new System.Drawing.Point(8, 16);
linkLabel1.LinkClick += new System.EventHandler(linkLabel1_LinkClicked);
this.Controls.Add(linkLabel1);
this.BackColor =
(System.Drawing.Color)System.Drawing.Color.FromARGB((byte)255, (byte)128, (byte)128);
}
protected void linkLabel1_LinkClicked(object sender, System.EventArgs e)
{
System.Diagnostics.Process.Start("IExplore"," http://www.csharphelp.com");
}
}
Here the above program is written by hand (Adding LinkLabelcontrol to a form programmatically)
The program below is the code generated by the WINDES.exe.
// Win32Form1.cs
namespace Win32Form1Namespace {
using System;
using System.Drawing;
using System.ComponentModel;
using System.WinForms;
///
/// Summary description for Win32Form1.
///
public class Win32Form1 : System.WinForms.Form {
///
/// Required by the Win Forms designer
///
private System.ComponentModel.Container components;
private System.WinForms.LinkLabel linkLabel1;
public Win32Form1() {
// Required for Win Form Designer support
InitializeComponent();
// TODO: Add any constructor code after InitializeComponent call
}
///
/// Clean up any resources being used
///
public override void Dispose() {
base.Dispose();
components.Dispose();
}
///
/// The main entry point for the application.
///
public static void Main(string[] args) {
Application.Run(new Win32Form1());
}
///
/// Required method for Designer support - do not modify
/// the contents of this method with an editor
///
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.linkLabel1 = new System.WinForms.LinkLabel();
//@design this.TrayHeight = 0;
//@design this.TrayLargeIcon = false;
//@design this.TrayAutoArrange = true;
linkLabel1.Text = "To know C# - visit www.csharpheaven.com - Click Here!";
linkLabel1.Size = new System.Drawing.Size(184, 56);
linkLabel1.LinkColor = System.Drawing.Color.Teal;
linkLabel1.LinkArea = new System.Drawing.Point(42, 11);
linkLabel1.ForeColor = System.Drawing.Color.Maroon;
linkLabel1.Font =
new System.Drawing.Font("Times New Roman", 10f, System.Drawing.FontStyle.Bold);
linkLabel1.TabIndex = 0;
linkLabel1.DisabledLinkColor = System.Drawing.Color.Yellow;
linkLabel1.TabStop = true;
linkLabel1.Location = new System.Drawing.Point(8, 16);
linkLabel1.BackColor =
(System.Drawing.Color)System.Drawing.Color.FromARGB((byte)255, (byte)192, (byte)128);
linkLabel1.LinkClick += new System.EventHandler(linkLabel1_LinkClick);
this.Text = "Win32Form1";
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.KeyPreview = true;
this.TransparencyKey = System.Drawing.Color.White;
this.BackColor =
(System.Drawing.Color)System.Drawing.Color.FromARGB((byte)255, (byte)128, (byte)128);
this.ClientSize = new System.Drawing.Size(272, 149);
this.Click += new System.EventHandler(Win32Form1_Click);
this.Controls.Add(linkLabel1);
}
protected void Win32Form1_Click(object sender, System.EventArgs e)
{
}
protected void linkLabel1_LinkClick(object sender, System.EventArgs e)
{
System.Diagnostics.Process.Start("IExplore", "http://www.csharphelp.com" );
linkLabel1.LinkVisited = true;
}
}
}
