LinkLabel.LinkVisited-Eigenschaft

Ruft einen Wert ab, der angibt, ob ein Hyperlink als bereits besuchter Hyperlink angezeigt werden soll, oder legt diesen Wert fest.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

Syntax

'Declaration
Public Property LinkVisited As Boolean
'Usage
Dim instance As LinkLabel
Dim value As Boolean

value = instance.LinkVisited

instance.LinkVisited = value

public bool LinkVisited { get; set; }

public:
property bool LinkVisited {
    bool get ();
    void set (bool value);
}

/** @property */
public boolean get_LinkVisited ()

/** @property */
public void set_LinkVisited (boolean value)

public function get LinkVisited () : boolean

public function set LinkVisited (value : boolean)

Eigenschaftenwert

true, wenn Hyperlinks als bereits besuchte Hyperlinks angezeigt werden sollen, andernfalls false. Der Standardwert ist false.

Hinweise

Ein LinkLabel-Steuerelement weist nicht automatisch darauf hin, dass es sich bei einem Hyperlink um einen bereits besuchten Hyperlink handelt. Sie können den Wert dieser Eigenschaft in einem Ereignishandler für das LinkClicked-Ereignis eines LinkLabel auf true festlegen, um einen Hyperlink als besuchten Hyperlink anzuzeigen. Ein bereits besuchter Hyperlink wird in der Farbe dargestellt, die in der VisitedLinkColor-Eigenschaft des LinkLabel-Steuerelements festgelegt wurde. Der dem Hyperlink zugeordnete Zustand "Alle anzeigen" wird gelöscht, wenn das Formular mit dem LinkLabel-Steuerelement geschlossen wird. Wenn der Anzeigezustand des Hyperlinks beibehalten werden soll, müssen Sie ihn in einer der Anwendung zugeordneten Registrierungseinstellung speichern.

Beispiel

Im folgenden Beispiel wird das Festlegen der LinkBehavior-Eigenschaft mithilfe der LinkBehavior-Enumeration veranschaulicht. Außerdem wird das Festlegen der ActiveLinkColor-Eigenschaft, der LinkColor-Eigenschaft und der LinkVisited-Eigenschaft dargestellt. Fügen Sie das Beispiel zum Ausführen in ein leeres Formular ein, und rufen Sie InitializeLinkLabel im Konstruktor oder in der Load-Methode des Formulars auf.

' Declare the LinkLabel object.
Friend WithEvents LinkLabel1 As System.Windows.Forms.LinkLabel

' Declare keywords array to identify links
Dim keywords() As String

Private Sub InitializeLinkLabel()
    Me.LinkLabel1 = New System.Windows.Forms.LinkLabel
    Me.LinkLabel1.Links.Clear()
    ' Set the location, name and size.
    Me.LinkLabel1.Location = New System.Drawing.Point(10, 20)
    Me.LinkLabel1.Name = "CompanyLinks"
    Me.LinkLabel1.Size = New System.Drawing.Size(104, 150)

    ' Set the LinkBehavior property to show underline when mouse
    ' hovers over the links.
    Me.LinkLabel1.LinkBehavior = _
        System.Windows.Forms.LinkBehavior.HoverUnderline
    Dim textString As String = "For more information see our" & _
       " company website or the research page at Contoso Ltd. "

    ' Set the text property.
    Me.LinkLabel1.Text = textString

    ' Set the color of the links to black, unless the mouse
    ' is hovering over a link.
    Me.LinkLabel1.LinkColor = System.Drawing.Color.Black
    Me.LinkLabel1.ActiveLinkColor = System.Drawing.Color.Blue

    ' Add links to the LinkCollection using starting index and
    ' length of keywords.
    keywords = New String() {"company", "research"}
    Dim keyword As String
    For Each keyword In keywords
        Me.LinkLabel1.Links.Add(textString.IndexOf(keyword), keyword.Length)
    Next

    ' Add the label to the form.
    Me.Controls.Add(Me.LinkLabel1)
End Sub

Private Sub LinkLabel1_LinkClicked(ByVal sender As Object, _
    ByVal e As LinkLabelLinkClickedEventArgs) _
    Handles LinkLabel1.LinkClicked

    Dim url As String

    ' Determine which link was clicked and set the appropriate url.
    Select Case LinkLabel1.Links.IndexOf(e.Link)
        Case 0
            url = "www.microsoft.com"

        Case 1
            url = "www.contoso.com/research"
    End Select

    ' Set the visited property to True. This will change
    ' the color of the link.
    e.Link.Visited = True

    ' Open Internet Explorer to the correct url.
    System.Diagnostics.Process.Start("IExplore.exe", url)
End Sub

// Declare the LinkLabel object.
internal System.Windows.Forms.LinkLabel LinkLabel1;

// Declare keywords array to identify links
string[] keywords;

private void InitializeLinkLabel()
{
    this.LinkLabel1 = new System.Windows.Forms.LinkLabel();
            this.LinkLabel1.Links.Clear();

    // Set the location, name and size.
    this.LinkLabel1.Location = new System.Drawing.Point(10, 20);
    this.LinkLabel1.Name = "CompanyLinks";
    this.LinkLabel1.Size = new System.Drawing.Size(104, 150);

    // Set the LinkBehavior property to show underline when mouse
    // hovers over the links.
    this.LinkLabel1.LinkBehavior = System.Windows.Forms.LinkBehavior.HoverUnderline;
    string textString = "For more information see our" +
        " company website or the research page at Contoso Ltd. ";

    // Set the text property.
    this.LinkLabel1.Text = textString;

    // Set the color of the links to black, unless the mouse
    // is hovering over a link.
    this.LinkLabel1.LinkColor = System.Drawing.Color.Black;
    this.LinkLabel1.ActiveLinkColor = System.Drawing.Color.Blue;

    // Associate the event-handling method with the LinkClicked
    // event.
    this.LinkLabel1.LinkClicked += 
        new LinkLabelLinkClickedEventHandler(LinkLabel1_LinkClicked);

    // Add links to the LinkCollection using starting index and
    // length of keywords.
    keywords = new string[]{"company", "research"};
    foreach ( string keyword in keywords )
    {
        this.LinkLabel1.Links.Add(textString.IndexOf(keyword), keyword.Length);
    }

    // Add the label to the form.
    this.Controls.Add(this.LinkLabel1);
}

private void LinkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{

    string url = "";

    // Determine which link was clicked and set the appropriate url.
    switch(LinkLabel1.Links.IndexOf(e.Link))
    {
        case 0:
            url = "www.microsoft.com";

            break;
        case 1:
            url = "www.contoso.com/research";
            break;
    }

    // Set the visited property to True. This will change
    // the color of the link.
    e.Link.Visited = true;

    // Open Internet Explorer to the correct url.
    System.Diagnostics.Process.Start("IExplore.exe", url);
}

   // Declare the LinkLabel object.
internal:
   System::Windows::Forms::LinkLabel^ LinkLabel1;

   // Declare keywords array to identify links
   array<String^>^keywords;

private:
   void InitializeLinkLabel()
   {
      this->LinkLabel1 = gcnew System::Windows::Forms::LinkLabel;
      this->LinkLabel1->Links->Clear();
      // Set the location, name and size.
      this->LinkLabel1->Location = System::Drawing::Point( 10, 20 );
      this->LinkLabel1->Name = "CompanyLinks";
      this->LinkLabel1->Size = System::Drawing::Size( 104, 150 );
      
      // Set the LinkBehavior property to show underline when mouse
      // hovers over the links.
      this->LinkLabel1->LinkBehavior = System::Windows::Forms::LinkBehavior::HoverUnderline;
      String^ textString = "For more information see our"
      " company website or the research page at Contoso Ltd. ";
      
      // Set the text property.
      this->LinkLabel1->Text = textString;
      
      // Set the color of the links to black, unless the mouse
      // is hovering over a link.
      this->LinkLabel1->LinkColor = System::Drawing::Color::Black;
      this->LinkLabel1->ActiveLinkColor = System::Drawing::Color::Blue;
      
      // Associate the event-handling method with the LinkClicked
      // event.
      this->LinkLabel1->LinkClicked += gcnew LinkLabelLinkClickedEventHandler( this, &Form1::LinkLabel1_LinkClicked );
      
      // Add links to the LinkCollection using starting index and
      // length of keywords.
      array<String^>^temp0 = {"company","research"};
      keywords = temp0;
      System::Collections::IEnumerator^ myEnum = keywords->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         String^ keyword = safe_cast<String^>(myEnum->Current);
         this->LinkLabel1->Links->Add( textString->IndexOf( keyword ), keyword->Length );
      }

      
      // Add the label to the form.
      this->Controls->Add( this->LinkLabel1 );
   }

   void LinkLabel1_LinkClicked( Object^ /*sender*/, LinkLabelLinkClickedEventArgs^ e )
   {
      String^ url = "";
      
      // Determine which link was clicked and set the appropriate url.
      switch ( LinkLabel1->Links->IndexOf( e->Link ) )
      {
         case 0:
            url = "www.microsoft.com";
            break;

         case 1:
            url = "www.contoso.com/research";
            break;
      }
      
      // Set the visited property to True. This will change
      // the color of the link.
      e->Link->Visited = true;
      
      // Open Internet Explorer to the correct url.
      System::Diagnostics::Process::Start( "IExplore.exe", url );
   }

// Declare the LinkLabel object.
private System.Windows.Forms.LinkLabel linkLabel1;

// Declare keywords array to identify links
private String keywords[];

private void InitializeLinkLabel()
{
    this.linkLabel1 = new System.Windows.Forms.LinkLabel();
    // Set the location, name and size.
    this.linkLabel1.set_Location(new System.Drawing.Point(10, 20));
    this.linkLabel1.set_Name("CompanyLinks");
    this.linkLabel1.set_Size(new System.Drawing.Size(104, 150));
    // Set the LinkBehavior property to show underline when mouse
    // hovers over the links.
    this.linkLabel1.set_LinkBehavior(
        System.Windows.Forms.LinkBehavior.HoverUnderline);
    String textString = "For more information see our" 
        + " company website or the research page at Contoso Ltd. ";
    // Set the text property.
    this.linkLabel1.set_Text(textString);
    // Set the color of the links to black, unless the mouse
    // is hovering over a link.
    this.linkLabel1.set_LinkColor(System.Drawing.Color.get_Black());
    this.linkLabel1.set_ActiveLinkColor(System.Drawing.Color.get_Blue());
    // Associate the event-handling method with the LinkClicked
    // event.
    this.linkLabel1.add_LinkClicked(new LinkLabelLinkClickedEventHandler(
        linkLabel1_LinkClicked));
    // Add links to the LinkCollection using starting index and
    // length of keywords.
    keywords = new String[] { "company", "research" };
    for (int iCtr = 0; iCtr < keywords.length; iCtr++) {
        String keyword = keywords[iCtr];
        this.linkLabel1.get_Links().Add(textString.IndexOf(keyword), 
            keyword.get_Length());
    }
    // Add the label to the form.
    this.get_Controls().Add(this.linkLabel1);
} //InitializeLinkLabel

private void linkLabel1_LinkClicked(Object sender, 
    LinkLabelLinkClickedEventArgs e)
{
    String url = "";
    // Determine which link was clicked and set the appropriate url.
    switch (linkLabel1.get_Links().IndexOf(e.get_Link())) {
        case 0:
            url = "www.microsoft.com";
            break;

        case 1:
            url = "www.contoso.com/research";
            break;
    }
    // Set the visited property to True. This will change
    // the color of the link.
    e.get_Link().set_Visited(true);
    // Open Internet Explorer to the correct url.
    System.Diagnostics.Process.Start("IExplore.exe", url);
} //linkLabel1_LinkClicked

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