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LinkLabel.LinkClicked Event

Occurs when a link is clicked within the control.

[Visual Basic]
Public Event LinkClicked As LinkLabelLinkClickedEventHandler
[C#]
public event LinkLabelLinkClickedEventHandler LinkClicked;
[C++]
public: __event LinkLabelLinkClickedEventHandler* LinkClicked;

[JScript] In JScript, you can handle the events defined by a class, but you cannot define your own.

Event Data

The event handler receives an argument of type LinkLabelLinkClickedEventArgs containing data related to this event. The following LinkLabelLinkClickedEventArgs property provides information specific to this event.

Property Description
Link Gets the LinkLabel.Link that was clicked.

Remarks

Typically, the LinkClicked event is handled to perform tasks when the user clicks on a link in the control. The event handler for the LinkClicked event is passed an instance of the LinkLabelLinkClickedEventArgs class that contains a LinkLabel.Link object that is associated with the link that was clicked. You can use information specified in the LinkData property of LinkLabel.Link class to determine which link was clicked or what type of task to perform when the link is clicked. For example, if a LinkLabel control has a LinkLabel.Link object defined with its LinkData property set to the string www.microsoft.com, you can use this information in an event handler for the LinkClicked event to display the Web site.

For more information about handling events, see Consuming Events.

Example

[Visual Basic, C#, C++] 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 LinkCollection.Add method. The example handles the LinkClicked event by starting the Web browser for hyperlinks, and displaying a MessageBox for other links.

[Visual Basic] 
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

[C#] 
using System;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
    private System.Windows.Forms.LinkLabel linkLabel1;
    
    [STAThread]
    static void Main() 
    {
        Application.Run(new Form1());
    }

    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.Location = new System.Drawing.Point(34, 56);
        this.linkLabel1.Size = new System.Drawing.Size(224, 16);
        this.linkLabel1.AutoSize = true;

        // Configure the appearance. 
        // Set the DisabledLinkColor so that a disabled link will show up against the form's background.
        this.linkLabel1.DisabledLinkColor = System.Drawing.Color.Red;
        this.linkLabel1.VisitedLinkColor = System.Drawing.Color.Blue;
        this.linkLabel1.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline;
        this.linkLabel1.LinkColor = System.Drawing.Color.Navy;
        
        this.linkLabel1.TabIndex = 0;
        this.linkLabel1.TabStop = true;
        

        // Add an event handler to do something when the links are clicked.
        this.linkLabel1.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked);

        // Identify what the first Link is.
        this.linkLabel1.LinkArea = new System.Windows.Forms.LinkArea(0, 8);

        // Identify that the first link is visited already.
        this.linkLabel1.Links[0].Visited = true;
        
        // Set the Text property to a string.
        this.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(this.linkLabel1.Text.Length >= 45)
        {
            this.linkLabel1.Links[0].LinkData = "Register";
            this.linkLabel1.Links.Add(24, 9, "www.microsoft.com");
            this.linkLabel1.Links.Add(42, 3, "www.msn.com");
        //  The second link is disabled and will appear as red.
            this.linkLabel1.Links[1].Enabled = false;
        }
        
        // Set up how the form should be displayed and add the controls to the form.
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {this.linkLabel1});
        this.Text = "Link Label Example";
    }

    private void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
    {
        // Determine which link was clicked within the LinkLabel.
        this.linkLabel1.Links[linkLabel1.Links.IndexOf(e.Link)].Visited = true;

        // Display the appropriate link based on the value of the 
        // LinkData property of the Link object.
        string target = e.Link.LinkData as string;

        // 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);
        }
    }
}

[C++] 
#using <mscorlib.dll>
#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;

public __gc class Form1 : public System::Windows::Forms::Form {
private:
   System::Windows::Forms::LinkLabel*  linkLabel1;
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->Location =  System::Drawing::Point(34, 56);
      this->linkLabel1->Size =  System::Drawing::Size(224, 16);
      this->linkLabel1->AutoSize = true;

      // Configure the appearance.
      this->linkLabel1->DisabledLinkColor = System::Drawing::Color::Red;
      this->linkLabel1->VisitedLinkColor = System::Drawing::Color::Blue;
      this->linkLabel1->LinkBehavior = System::Windows::Forms::LinkBehavior::HoverUnderline;
      this->linkLabel1->LinkColor = System::Drawing::Color::Navy;

      this->linkLabel1->TabIndex = 0;
      this->linkLabel1->TabStop = true;


      // Add an event handler to do something when the links are clicked.
      this->linkLabel1->LinkClicked += new System::Windows::Forms::LinkLabelLinkClickedEventHandler(this, &Form1::linkLabel1_LinkClicked);

      // Identify what the first Link is.
      this->linkLabel1->LinkArea =  System::Windows::Forms::LinkArea(0, 8);

      // Identify that the first link is visited already.
      this->linkLabel1->Links->Item[0]->Visited = true;

      // Set the Text property to a String*.
      this->linkLabel1->Text = S"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->Text->Length >= 45) {
         this->linkLabel1->Links->Item[0]->LinkData = S"Register";
         this->linkLabel1->Links->Add(24, 9, S"www.microsoft.com");
         this->linkLabel1->Links->Add(42, 3, S"www.msn.com");
         this->linkLabel1->Links->Item[1]->Enabled = false;
      }

      // Set up how the form should be displayed and add the controls to the form.
      this->ClientSize =  System::Drawing::Size(292, 266);

      System::Windows::Forms::Control* temp0 [] = {this->linkLabel1};

      this->Controls->AddRange(temp0);
      this->Text = S"Link Label Example";
   }

private:
   void linkLabel1_LinkClicked(Object* /*sender*/, System::Windows::Forms::LinkLabelLinkClickedEventArgs* e) {
      // Determine which link was clicked within the LinkLabel.
      this->linkLabel1->Links->Item[linkLabel1->Links->IndexOf(e->Link)]->Visited = true;

      // Display the appropriate link based on the value of the
      // LinkData property of the Link Object*.
      String* target = dynamic_cast<String*>(e->Link->LinkData);

      // If the value looks like a URL, navigate to it.
      // Otherwise, display it in a message box.
      if (0 != target && target->StartsWith(S"www")) {
         System::Diagnostics::Process::Start(target);
      } else {
         MessageBox::Show(S"Item clicked: {0}", target);
      }
   }
};

[STAThread]
int main() {
   Application::Run(new Form1());
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

LinkLabel Class | LinkLabel Members | System.Windows.Forms Namespace | LinkLabelLinkClickedEventHandler | OnLinkClicked

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