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Classe LinkLabelLinkClickedEventArgs

Aggiornamento: novembre 2007

Fornisce i dati per l'evento LinkClicked.

Spazio dei nomi:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

[ComVisibleAttribute(true)]
public class LinkLabelLinkClickedEventArgs : EventArgs
/** @attribute ComVisibleAttribute(true) */
public class LinkLabelLinkClickedEventArgs extends EventArgs
public class LinkLabelLinkClickedEventArgs extends EventArgs

Nell'esempio di codice riportato di seguito viene illustrato come utilizzare la classe LinkLabel, in cui sono definite più sezioni LinkArea, per visualizzare un'etichetta in un form. Viene illustrata l'impostazione delle proprietà AutoSize, LinkBehavior, DisabledLinkColor, LinkColor e VisitedLinkColor per personalizzare l'aspetto dell'oggetto LinkLabel. Il primo oggetto LinkArea è specificato mediante la proprietà LinkLabel.LinkArea. Ulteriori collegamenti vengono aggiunti all'oggetto LinkLabel mediante il metodo LinkLabel.LinkCollection.Add. Nell'esempio viene gestito l'evento LinkClicked mediante l'avvio del browser per i collegamenti ipertestuali e mediante la visualizzazione di un controllo MessageBox nel caso di altri collegamenti.

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);
        }
    }
}


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


System.Object
  System.EventArgs
    System.Windows.Forms.LinkLabelLinkClickedEventArgs
Qualsiasi membro static (Shared in Visual Basic) pubblico di questo tipo è thread-safe. I membri di istanza non sono garantiti come thread-safe.

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition , Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework e .NET Compact Framework non supportano tutte le versioni di ciascuna piattaforma. Per un elenco delle versioni supportate, vedere Requisiti di sistema di .NET Framework.

.NET Framework

Supportato in: 3.5, 3.0, 2.0, 1.1, 1.0
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