LinkLabelLinkClickedEventHandler Delegate
Assembly: System.Windows.Forms (in system.windows.forms.dll)
'Declaration Public Delegate Sub LinkLabelLinkClickedEventHandler ( _ sender As Object, _ e As LinkLabelLinkClickedEventArgs _ ) 'Usage Dim instance As New LinkLabelLinkClickedEventHandler(AddressOf HandlerMethod)
/** @delegate */ public delegate void LinkLabelLinkClickedEventHandler ( Object sender, LinkLabelLinkClickedEventArgs e )
JScript supports the use of delegates, but not the declaration of new ones.
Parameters
- sender
The source of the event.
- e
A LinkLabelLinkClickedEventArgs that contains the event data.
When you create a LinkLabelLinkClickedEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, until you remove the delegate. For more information about delegates, see Events and Delegates.
The following example demonstrates using the LinkLabel class, with multiple LinkArea sections defined, to display a label on a form. The example demonstrates setting the AutoSize, LinkBehavior, DisabledLinkColor, LinkColor, and VisitedLinkColor properties to customize the look of the LinkLabel. The first LinkArea is specified using the LinkLabel.LinkArea property. Additional links are added to the LinkLabel using the LinkLabel.LinkCollection.Add method. The example handles the LinkClicked event by starting the Web browser for hyperlinks, and displaying a MessageBox for other links.
Imports System Imports System.Drawing Imports System.Windows.Forms Public NotInheritable Class Form1 Inherits System.Windows.Forms.Form Friend WithEvents LinkLabel1 As System.Windows.Forms.LinkLabel <System.STAThread()> _ Public Shared Sub Main() System.Windows.Forms.Application.Run(New Form1) End Sub 'Main Public Sub New() MyBase.New() Me.LinkLabel1 = New System.Windows.Forms.LinkLabel ' Configure the LinkLabel's size and location. Specify that the ' size should be automatically determined by the content. Me.linkLabel1.Location = New System.Drawing.Point(34, 56) Me.linkLabel1.Size = New System.Drawing.Size(224, 16) Me.linkLabel1.AutoSize = True ' Configure the appearance. ' Set the DisabledLinkColor so that a disabled link will show up against the form's background. Me.linkLabel1.DisabledLinkColor = System.Drawing.Color.Red Me.linkLabel1.VisitedLinkColor = System.Drawing.Color.Blue Me.linkLabel1.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline Me.linkLabel1.LinkColor = System.Drawing.Color.Navy Me.linkLabel1.TabIndex = 0 Me.linkLabel1.TabStop = True ' Identify what the first Link is. Me.linkLabel1.LinkArea = New System.Windows.Forms.LinkArea(0, 8) ' Identify that the first link is visited already. Me.linkLabel1.Links(0).Visited = true ' Set the Text property to a string. Me.linkLabel1.Text = "Register Online. Visit Microsoft. Visit MSN." ' Create new links using the Add method of the LinkCollection class. ' Underline the appropriate words in the LinkLabel's Text property. ' The words 'Register', 'Microsoft', and 'MSN' will ' all be underlined and behave as hyperlinks. ' First check that the Text property is long enough to accommodate ' the desired hyperlinked areas. If it's not, don't add hyperlinks. If Me.LinkLabel1.Text.Length >= 45 Then Me.LinkLabel1.Links(0).LinkData = "Register" Me.LinkLabel1.Links.Add(24, 9, "www.microsoft.com") Me.LinkLabel1.Links.Add(42, 3, "www.msn.com") ' The second link is disabled and will appear as red. Me.linkLabel1.Links(1).Enabled = False End If ' Set up how the form should be displayed and adds the controls to the form. Me.ClientSize = New System.Drawing.Size(292, 266) Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.LinkLabel1}) Me.Text = "Link Label Example" End Sub Private Sub linkLabel1_LinkClicked(ByVal sender As Object, _ ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked ' Determine which link was clicked within the LinkLabel. Me.LinkLabel1.Links(LinkLabel1.Links.IndexOf(e.Link)).Visited = True ' Displays the appropriate link based on the value of the LinkData property of the Link object. Dim target As String = CType(e.Link.LinkData, String) ' If the value looks like a URL, navigate to it. ' Otherwise, display it in a message box. If (Nothing <> target) And (target.StartsWith("www")) Then System.Diagnostics.Process.Start(target) Else MessageBox.Show(("Item clicked: " + target)) End If End Sub End Class
import System.*;
import System.Drawing.*;
import System.Windows.Forms.*;
public class Form1 extends System.Windows.Forms.Form
{
private System.Windows.Forms.LinkLabel linkLabel1;
/** @attribute STAThread()
*/
public static void main(String[] args)
{
Application.Run(new Form1());
} //main
public Form1()
{
// Create the LinkLabel.
this.linkLabel1 = new System.Windows.Forms.LinkLabel();
// Configure the LinkLabel's size and location. Specify that the
// size should be automatically determined by the content.
this.linkLabel1.set_Location(new System.Drawing.Point(34, 56));
this.linkLabel1.set_Size(new System.Drawing.Size(224, 16));
this.linkLabel1.set_AutoSize(true);
// Configure the appearance.
// Set the DisabledLinkColor so that a disabled link will show up
// against the form's background.
this.linkLabel1.set_DisabledLinkColor(System.Drawing.Color.get_Red());
this.linkLabel1.set_VisitedLinkColor(System.Drawing.Color.get_Blue());
this.linkLabel1.set_LinkBehavior(
System.Windows.Forms.LinkBehavior.HoverUnderline);
this.linkLabel1.set_LinkColor(System.Drawing.Color.get_Navy());
this.linkLabel1.set_TabIndex(0);
this.linkLabel1.set_TabStop(true);
// Add an event handler to do something when the links are clicked.
this.linkLabel1.add_LinkClicked(new System.Windows.Forms.
LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked));
// Identify what the first Link is.
this.linkLabel1.set_LinkArea(new System.Windows.Forms.LinkArea(0, 8));
// Identify that the first link is visited already.
this.linkLabel1.get_Links().get_Item(0).set_Visited(true);
// Set the Text property to a string.
this.linkLabel1.set_Text("Register Online. Visit Microsoft."
+ " Visit MSN.");
// Create new links using the Add method of the LinkCollection class.
// Underline the appropriate words in the LinkLabel's Text property.
// The words 'Register', 'Microsoft', and 'MSN' will
// all be underlined and behave as hyperlinks.
// First check that the Text property is long enough to accommodate
// the desired hyperlinked areas. If it's not, don't add hyperlinks.
if (this.linkLabel1.get_Text().get_Length() >= 45) {
this.linkLabel1.get_Links().get_Item(0).set_LinkData("Register");
this.linkLabel1.get_Links().Add(24, 9, "www.microsoft.com");
this.linkLabel1.get_Links().Add(42, 3, "www.msn.com");
// The second link is disabled and will appear as red.
this.linkLabel1.get_Links().get_Item(1).set_Enabled(false);
}
// Set up how the form should be displayed and add the controls to
// the form.
this.set_ClientSize(new System.Drawing.Size(292, 266));
this.get_Controls().AddRange(new System.Windows.Forms.Control[] {
this.linkLabel1 });
this.set_Text("Link Label Example");
} //Form1
private void linkLabel1_LinkClicked(Object sender,
System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
{
// Determine which link was clicked within the LinkLabel.
this.linkLabel1.get_Links().get_Item(linkLabel1.get_Links().
IndexOf(e.get_Link())).set_Visited(true);
// Display the appropriate link based on the value of the
// LinkData property of the Link object.
String target = (String)e.get_Link().get_LinkData();
// If the value looks like a URL, navigate to it.
// Otherwise, display it in a message box.
if (null != target && target.StartsWith("www")) {
System.Diagnostics.Process.Start(target);
}
else {
MessageBox.Show("Item clicked: " + target);
}
} //linkLabel1_LinkClicked
} //Form1
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.