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LinkLabelLinkClickedEventHandler Delegate

Represents the method that will handle the LinkClicked event of a LinkLabel.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public delegate void LinkLabelLinkClickedEventHandler(
	Object^ sender, 
	LinkLabelLinkClickedEventArgs^ e
)

Parameters

sender
Type: System::Object

The source of the event.

e
Type: System.Windows.Forms::LinkLabelLinkClickedEventArgs

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 Handling and Raising Events.

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.

#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 ref class Form1: public System::Windows::Forms::Form
{
private:
   System::Windows::Forms::LinkLabel^ linkLabel1;

public:
   Form1()
   {

      // Create the LinkLabel. 
      this->linkLabel1 = gcnew 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 += gcnew 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[ 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" );
         this->linkLabel1->Links[ 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 );
      array<System::Windows::Forms::Control^>^temp0 = {this->linkLabel1};
      this->Controls->AddRange( temp0 );
      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 = dynamic_cast<String^>(e->Link->LinkData);

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

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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