LinkLabel.LinkClicked-Ereignis
Tritt ein, wenn im Steuerelement auf einen Hyperlink geklickt wird.
Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)
Syntax
'Declaration
Public Event LinkClicked As LinkLabelLinkClickedEventHandler
'Usage
Dim instance As LinkLabel
Dim handler As LinkLabelLinkClickedEventHandler
AddHandler instance.LinkClicked, handler
public event LinkLabelLinkClickedEventHandler LinkClicked
public:
event LinkLabelLinkClickedEventHandler^ LinkClicked {
void add (LinkLabelLinkClickedEventHandler^ value);
void remove (LinkLabelLinkClickedEventHandler^ value);
}
/** @event */
public void add_LinkClicked (LinkLabelLinkClickedEventHandler value)
/** @event */
public void remove_LinkClicked (LinkLabelLinkClickedEventHandler value)
JScript unterstützt die Verwendung von Ereignissen, aber nicht die Deklaration von neuen Ereignissen.
Hinweise
In der Regel wird das LinkClicked-Ereignis verarbeitet, um Aufgaben auszuführen, wenn der Benutzer im Steuerelement auf einen Hyperlink klickt. Dem Ereignishandler für das LinkClicked-Ereignis wird eine Instanz der LinkLabelLinkClickedEventArgs-Klasse übergeben, die ein LinkLabel.Link-Objekt enthält, das dem Hyperlink zugeordnet ist, auf den geklickt wurde. Sie können in der LinkData-Eigenschaft der LinkLabel.Link-Klasse angegebene Informationen verwenden, um festzustellen, auf welchen Hyperlink geklickt wurde, oder um zu bestimmen, welche Art von Aufgabe ausgeführt werden soll, wenn auf den Hyperlink geklickt wird. Wenn z. B. in einem LinkLabel-Steuerelement ein LinkLabel.Link-Objekt definiert ist, dessen LinkData-Eigenschaft auf die Zeichenfolge www.microsoft.com festgelegt ist, können Sie diese Informationen in einem Ereignishandler für das LinkClicked-Ereignis verwenden, um die Website anzuzeigen.
Weitere Informationen zum Behandeln von Ereignissen finden Sie unter Behandeln von Ereignissen.
Beispiel
Im folgenden Beispiel wird die Verwendung der LinkLabel-Klasse veranschaulicht, wobei mehrere LinkArea-Abschnitte definiert sind, um eine Beschriftung auf einem Formular anzuzeigen. Das Beispiel veranschaulicht das Festlegen der AutoSize-Eigenschaft, der LinkBehavior-Eigenschaft, der DisabledLinkColor-Eigenschaft, der LinkColor-Eigenschaft und der VisitedLinkColor-Eigenschaft zum Anpassen der Darstellung von LinkLabel. Die erste LinkArea wird mithilfe der LinkLabel.LinkArea-Eigenschaft angegeben. Dem LinkLabel werden mit der LinkLabel.LinkCollection.Add-Methode weitere Verknüpfungen hinzugefügt. Im Beispiel wird das LinkClicked-Ereignis durch Starten des Webbrowsers für Hyperlinks und Anzeigen einer MessageBox für andere Verknüpfungen behandelt.
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
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);
}
}
}
#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 );
}
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
Plattformen
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
LinkLabel-Klasse
LinkLabel-Member
System.Windows.Forms-Namespace
LinkLabelLinkClickedEventHandler
OnLinkClicked