LinkArea 结构

表示 LinkLabel 控件内的区域，该区域表示控件内的超链接。

**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）

语法

声明
<SerializableAttribute> _
Public Structure LinkArea
用法
Dim instance As LinkArea

[SerializableAttribute] 
public struct LinkArea

[SerializableAttribute] 
public value class LinkArea

/** @attribute SerializableAttribute() */ 
public final class LinkArea extends ValueType

JScript 支持使用结构，但不支持进行新的声明。

备注

有两种方法向 LinkLabel 控件的文本中添加超链接。可以通过 LinkLabel 的 Links 属性访问 LinkLabel.LinkCollection 类的 Add 方法，以将多个超链接添加到控件的文本中。如果仅需要将一个超链接添加到控件的文本中，可使用 LinkLabel 的 LinkArea 属性。此属性接受定义控件文本内的超链接位置的 LinkArea。当使用 LinkArea 属性指定超链接后，该链接区域随后添加到 LinkLabel.LinkCollection 中，所使用的方式与使用 LinkLabel.LinkCollection 的 Add 方法添加链接一样。

Length 属性指定链接区域中要包含的 LinkLabel 文本内的字符数目。Start 属性指定超链接中要包含的控件文本内的第一个字符。如果要确定特定 LinkArea 是否为空，可使用 IsEmpty 属性，而不是检查 Start 和 Length 属性的值。

示例

下面的代码示例演示如何使用 LinkLabel 类并定义多个 LinkArea 区域，来显示窗体中的标签。该示例演示了如何设置 AutoSize、LinkBehavior、DisabledLinkColor、LinkColor 和 VisitedLinkColor 属性来自定义 LinkLabel 的外观。使用 LinkLabel.LinkArea 属性指定第一个 LinkArea。使用 LinkLabel.LinkCollection.Add 方法将其他链接添加到 LinkLabel。该示例通过启动超链接的 Web 浏览器并显示其他链接的 MessageBox 来处理 LinkClicked 事件。

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

    End Sub

End Class

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);
        }
    }
}

#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 );
}

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

线程安全

此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。

版本信息

.NET Framework

受以下版本支持：2.0、1.1、1.0

请参见

参考

LinkArea 成员
System.Windows.Forms 命名空间
LinkArea
LinkLabel
LinkLabel.LinkCollection