LinkLabel.LinkArea Propriedade

Definição

Obtém ou define o intervalo no texto a ser tratado como um link.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 da propriedade

Um LinkArea que representa a área tratada como um link.A LinkArea that represents the area treated as a link.

Exceções

A propriedade Start do objeto LinkArea é menor que zero.The Start property of the LinkArea object is less than zero.

- ou --or- A propriedade Length do objeto LinkArea é menor que -1.The Length property of the LinkArea object is less than -1.

Exemplos

O exemplo a seguir demonstra como usar a classe LinkLabel, com várias seções LinkArea definidas, para exibir um rótulo em um formulário.The following example demonstrates using the LinkLabel class, with multiple LinkArea sections defined, to display a label on a form. O exemplo demonstra como definir as propriedades AutoSize, LinkBehavior, DisabledLinkColor, LinkColore VisitedLinkColor para personalizar a aparência da LinkLabel.The example demonstrates setting the AutoSize, LinkBehavior, DisabledLinkColor, LinkColor, and VisitedLinkColor properties to customize the look of the LinkLabel. A primeira LinkArea é especificada usando a propriedade LinkLabel.LinkArea.The first LinkArea is specified using the LinkLabel.LinkArea property. Links adicionais são adicionados ao LinkLabel usando o método LinkLabel.LinkCollection.Add.Additional links are added to the LinkLabel using the LinkLabel.LinkCollection.Add method. O exemplo manipula o evento LinkClicked iniciando o navegador da Web para hiperlinks e exibindo um MessageBox para outros links.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

Comentários

A propriedade LinkArea fornece uma maneira rápida de especificar um único hiperlink para exibir no texto do controle de LinkLabel.The LinkArea property provides a quick way to specify a single hyperlink to display in the text of the LinkLabel control. O objeto LinkArea fornece propriedades que especificam a posição inicial do link dentro do texto do controle e o comprimento do texto para o hiperlink.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. Quando um hiperlink é especificado usando a propriedade LinkArea, o hiperlink é adicionado à LinkLabel.LinkCollection do controle.When a hyperlink is specified using the LinkArea property, the hyperlink is added to the LinkLabel.LinkCollection of the control. A propriedade LinkArea converte o objeto LinkArea atribuído a ele em um objeto LinkLabel.Link que é armazenado na coleção.The LinkArea property converts the LinkArea object assigned to it to a LinkLabel.Link object that is stored within the collection.

Para adicionar vários hiperlinks ao texto do controle, você pode usar a propriedade Links.To add multiple hyperlinks to the text of the control, you can use the Links property. A propriedade Links permite que você acesse as propriedades e os métodos da LinkLabel.LinkCollection, que armazena os links especificados para o controle.The Links property enables you to access the properties and methods of the LinkLabel.LinkCollection, which stores the links specified for the control. Esse método de adicionar links ao LinkLabel também permite que você especifique dados na propriedade LinkData associada ao link que está sendo criado.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. O valor da propriedade LinkData pode ser usado para armazenar o local de um arquivo a ser exibido ou o endereço de um site da 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.

Quando um controle de LinkLabel é criado, um hiperlink padrão que contém todo o texto dentro do controle de LinkLabel é adicionado à LinkLabel.LinkCollection.When a LinkLabel control is created, a default hyperlink that contains all the text within the LinkLabel control is added to the LinkLabel.LinkCollection. Você pode substituir esse link padrão especificando uma nova área de link com a propriedade LinkArea ou especificar um link usando o método Add da 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. Você também pode remover o hiperlink padrão usando o método Remove da classe LinkLabel.LinkCollection.You can also remove the default hyperlink by using the Remove method of the LinkLabel.LinkCollection class.

Observação

A propriedade LinkArea sempre retorna o primeiro item na LinkLabel.LinkCollection, independentemente de como o hiperlink foi adicionado à coleção.The LinkArea property always returns the first item in the LinkLabel.LinkCollection, regardless of how the hyperlink was added to the collection.

Observação

A propriedade Length em LinkArea será diferente se você chamar UseCompatibleTextRenderinge a propriedade Text contiver caracteres de byte duplo.The Length property on LinkArea will differ if you call UseCompatibleTextRendering, and the Text property contains double-byte characters. Se você chamar UseCompatibleTextRendering, ele retornará o número de bytes na cadeia de caracteres.If you call UseCompatibleTextRendering, it will return the number of bytes in the string. Caso contrário, retornará o número de caracteres reais.Otherwise, it will return the number of actual characters.

Aplica-se a

Veja também