LinkArea LinkArea LinkArea LinkArea Struct

Definizione

Rappresenta un'area all'interno di un LinkLabel controllo che rappresenta un collegamento ipertestuale all'interno del controllo.Represents an area within a LinkLabel control that represents a hyperlink within the control.

public value class LinkArea
[System.ComponentModel.TypeConverter(typeof(System.Windows.Forms.LinkArea/LinkAreaConverter))]
[System.Serializable]
public struct LinkArea
type LinkArea = struct
Public Structure LinkArea
Ereditarietà
Attributi

Esempi

Esempio di codice seguente viene illustrato come utilizzare il LinkLabel (classe), con più LinkArea sezioni definite, per visualizzare un'etichetta in un form.The following code example demonstrates using the LinkLabel class, with multiple LinkArea sections defined, to display a label on a form. Nell'esempio viene illustrato come impostare il AutoSize, LinkBehavior, DisabledLinkColor, LinkColor, e VisitedLinkColor le proprietà per personalizzare l'aspetto del LinkLabel.The example demonstrates setting the AutoSize, LinkBehavior, DisabledLinkColor, LinkColor, and VisitedLinkColor properties to customize the look of the LinkLabel. Il primo LinkArea viene specificato utilizzando il LinkLabel.LinkArea proprietà.The first LinkArea is specified using the LinkLabel.LinkArea property. Altri collegamenti vengono aggiunti per il LinkLabel utilizzando il LinkLabel.LinkCollection.Add (metodo).Additional links are added to the LinkLabel using the LinkLabel.LinkCollection.Add method. Nell'esempio viene gestito il LinkClicked evento di avvio del Web browser per i collegamenti ipertestuali e visualizzando un MessageBox per altri collegamenti.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
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 (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

Commenti

Esistono due modi per aggiungere un collegamento ipertestuale al testo di un LinkLabel controllo.There are two ways to add a hyperlink to the text of a LinkLabel control. È possibile accedere il Add metodo per il LinkLabel.LinkCollection classe tramite il Links proprietà del LinkLabel per aggiungere più collegamenti ipertestuali per il testo del controllo.You can access the Add method of the LinkLabel.LinkCollection class through the Links property of the LinkLabel to add multiple hyperlinks to the control's text. Se è necessario solo aggiungere un collegamento ipertestuale al testo del controllo, è possibile usare la LinkArea proprietà del LinkLabel.If you only need to add a single hyperlink to the text of the control, you can use the LinkArea property of the LinkLabel. Questa proprietà accetta un LinkArea che definisce la posizione del collegamento ipertestuale all'interno del testo del controllo.This property accepts a LinkArea that defines the location of the hyperlink within the control's text. Quando un collegamento ipertestuale viene specificato usando il LinkArea proprietà, l'area di collegamento viene quindi aggiunto al LinkLabel.LinkCollection allo stesso modo con cui si aggiunge il collegamento utilizzando il Add metodo del LinkLabel.LinkCollection.When a hyperlink is specified using the LinkArea property, the link area is then added to the LinkLabel.LinkCollection in the same manner as adding the link using the Add method of the LinkLabel.LinkCollection.

Il Length proprietà specifica il numero di caratteri all'interno del testo di LinkLabel da includere nell'area di collegamento.The Length property specifies the number of characters within the text of the LinkLabel to include in the link area. Il Start proprietà specifica il primo carattere nel testo del controllo da includere nel collegamento ipertestuale.The Start property specifies the first character in the control text to include in the hyperlink. Se si desidera determinare se uno specifico LinkArea è vuoto, è possibile usare il IsEmpty invece di selezionare i valori delle proprietà di Start e Length proprietà.If you want to determine whether a specific LinkArea is empty, you can use the IsEmpty property instead of checking the values of the Start and Length properties.

Costruttori

LinkArea(Int32, Int32) LinkArea(Int32, Int32) LinkArea(Int32, Int32) LinkArea(Int32, Int32)

Inizializza una nuova istanza della classe LinkArea.Initializes a new instance of the LinkArea class.

Proprietà

IsEmpty IsEmpty IsEmpty IsEmpty

Ottiene un valore che indica se l'oggetto LinkArea è vuoto.Gets a value indicating whether the LinkArea is empty.

Length Length Length Length

Ottiene o imposta il numero di caratteri nell'area di collegamento.Gets or sets the number of characters in the link area.

Start Start Start Start

Ottiene o imposta la posizione iniziale dell'area di collegamento all'interno del testo di LinkLabel.Gets or sets the starting location of the link area within the text of the LinkLabel.

Metodi

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina se questo LinkArea è uguale all'oggetto specificato.Determines whether this LinkArea is equal to the specified object.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Restituisce il codice hash per l'istanza.Returns the hash code for this instance.

ToString() ToString() ToString() ToString()

Restituisce il nome completo del tipo di questa istanza.Returns the fully qualified type name of this instance.

Operatori

Equality(LinkArea, LinkArea) Equality(LinkArea, LinkArea) Equality(LinkArea, LinkArea) Equality(LinkArea, LinkArea)

Restituisce un valore che indica se due istanze di una classe LinkArea sono uguali.Returns a value indicating whether two instances of the LinkArea class are equal.

Inequality(LinkArea, LinkArea) Inequality(LinkArea, LinkArea) Inequality(LinkArea, LinkArea) Inequality(LinkArea, LinkArea)

Restituisce un valore che indica se due istanze di LinkArea non sono uguali.Returns a value indicating whether two instances of the LinkArea class are not equal.

Si applica a

Vedi anche