LinkLabel.LinkArea LinkLabel.LinkArea LinkLabel.LinkArea LinkLabel.LinkArea Property

Definición

Obtiene o establece el intervalo del texto que se va a tratar como vínculo.Gets or sets the range in the text to treat as a link.

public:
 property System::Windows::Forms::LinkArea LinkArea { System::Windows::Forms::LinkArea get(); void set(System::Windows::Forms::LinkArea value); };
public System.Windows.Forms.LinkArea LinkArea { get; set; }
member this.LinkArea : System.Windows.Forms.LinkArea with get, set
Public Property LinkArea As LinkArea

Valor de propiedad

LinkArea que representa el área que se trata como vínculo.A LinkArea that represents the area treated as a link.

Excepciones

La propiedad Start del objeto LinkArea es menor que cero.The Start property of the LinkArea object is less than zero.

O bien-or- La propiedad Length del objeto LinkArea es menor que -1.The Length property of the LinkArea object is less than -1.

Ejemplos

En el ejemplo siguiente se muestra LinkLabel cómo usar la clase LinkArea , con varias secciones definidas, para mostrar una etiqueta en un formulario.The following example demonstrates using the LinkLabel class, with multiple LinkArea sections defined, to display a label on a form. En el ejemplo se muestra AutoSizecómo LinkBehaviorestablecer DisabledLinkColorlas propiedades, VisitedLinkColor ,, LinkColory para personalizar la apariencia LinkLabelde.The example demonstrates setting the AutoSize, LinkBehavior, DisabledLinkColor, LinkColor, and VisitedLinkColor properties to customize the look of the LinkLabel. La primera LinkArea se especifica mediante la LinkLabel.LinkArea propiedad.The first LinkArea is specified using the LinkLabel.LinkArea property. Los vínculos adicionales se agregan LinkLabel a mediante LinkLabel.LinkCollection.Add el método.Additional links are added to the LinkLabel using the LinkLabel.LinkCollection.Add method. El ejemplo controla el LinkClicked evento iniciando el explorador Web para los hipervínculos y mostrando un MessageBox para otros vínculos.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 );
}
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);
        }
    }
}
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

    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 (target IsNot Nothing) AndAlso (target.StartsWith("www")) Then
            System.Diagnostics.Process.Start(target)
        Else
            MessageBox.Show(("Item clicked: " + target))
        End If

    End Sub

End Class

Comentarios

La LinkArea propiedad proporciona una forma rápida de especificar un solo hipervínculo que se va a mostrar en LinkLabel el texto del control.The LinkArea property provides a quick way to specify a single hyperlink to display in the text of the LinkLabel control. El LinkArea objeto proporciona propiedades que especifican la posición inicial del vínculo en el texto del control y la longitud del texto del hipervínculo.The LinkArea object provides properties that specify the starting position of the link within the text of the control and the length of text for the hyperlink. Cuando se especifica un hipervínculo mediante LinkArea la propiedad, el hipervínculo se agrega LinkLabel.LinkCollection al del control.When a hyperlink is specified using the LinkArea property, the hyperlink is added to the LinkLabel.LinkCollection of the control. La LinkArea propiedad convierte el LinkArea objeto asignado a él en un LinkLabel.Link objeto almacenado en la colección.The LinkArea property converts the LinkArea object assigned to it to a LinkLabel.Link object that is stored within the collection.

Para agregar varios hipervínculos al texto del control, puede usar la Links propiedad.To add multiple hyperlinks to the text of the control, you can use the Links property. La Links propiedad le permite tener acceso a las propiedades y los métodos LinkLabel.LinkCollectionde, que almacena los vínculos especificados para el control.The Links property enables you to access the properties and methods of the LinkLabel.LinkCollection, which stores the links specified for the control. Este método de agregar vínculos a LinkLabel también le permite especificar los datos de la LinkData propiedad que está asociada con el vínculo que se está creando.This method of adding links to the LinkLabel also enables you to specify data in the LinkData property that is associated with the link being created. El valor de la LinkData propiedad se puede utilizar para almacenar la ubicación de un archivo que se va a mostrar o la dirección de un sitio Web.The value of the LinkData property can be used to store the location of a file to display or the address of a Web site.

Cuando se LinkLabel crea un control, se agrega a un hipervínculo predeterminado que contiene todo LinkLabel el texto dentro del LinkLabel.LinkCollectioncontrol.When a LinkLabel control is created, a default hyperlink that contains all the text within the LinkLabel control is added to the LinkLabel.LinkCollection. Para invalidar este vínculo predeterminado, especifique un área de vínculo nueva con la LinkArea propiedad o especifique un vínculo mediante el Add método de LinkLabel.LinkCollection.You can override this default link by specifying a new link area with the LinkArea property, or specify a link using the Add method of the LinkLabel.LinkCollection. También puede quitar el hipervínculo predeterminado mediante el Remove método de la LinkLabel.LinkCollection clase.You can also remove the default hyperlink by using the Remove method of the LinkLabel.LinkCollection class.

Nota

La LinkArea propiedad siempre devuelve el primer elemento LinkLabel.LinkCollectionde, independientemente de cómo se haya agregado el hipervínculo a la colección.The LinkArea property always returns the first item in the LinkLabel.LinkCollection, regardless of how the hyperlink was added to the collection.

Nota

La Length propiedad en LinkArea será diferente si se llama UseCompatibleTextRenderinga y la Text propiedad contiene caracteres de doble byte.The Length property on LinkArea will differ if you call UseCompatibleTextRendering, and the Text property contains double-byte characters. Si llama a UseCompatibleTextRendering, devolverá el número de bytes de la cadena.If you call UseCompatibleTextRendering, it will return the number of bytes in the string. De lo contrario, devolverá el número de caracteres reales.Otherwise, it will return the number of actual characters.

Se aplica a

Consulte también: