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Button Costruttore

  • Riferimento

Definizione

Spazio dei nomi:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Inizializza una nuova istanza della classe Button.

public:
 Button();
public Button ();
Public Sub New ()

Esempio

Nell'esempio di codice seguente viene illustrato come creare e inizializzare una nuova istanza della Button classe.


<%@ Page Language="C#" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">
    <title> Button Constructor Example </title>
<script runat="server">

      void Page_Load(Object sender, EventArgs e)
      {

         // Create a new Button control.
         Button NewButton = new Button();
         NewButton.Text="Click Me";

         // Register the event-handling method for the Click event. 
         NewButton.Click += new EventHandler(this.Button_Click);

         // Add the control to the Controls collection of the
         // PlaceHolder control. 
         Place.Controls.Clear();
         Place.Controls.Add(NewButton);

      }

      void Button_Click(Object sender, EventArgs e)
      {

         Message.Text = "Hello World";

      }

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3> Button Constructor Example </h3>

      <asp:Placeholder id="Place" 
           runat="server"/>

      <br /><br />

      <asp:Label id="Message" 
           runat="server"/>

   </form>

</body>

</html>


<%@ Page Language="VB" AutoEventWireup="True" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">
    <title> Button Constructor Example </title>
<script runat="server">

      Sub Page_Load(sender As Object, e As EventArgs)

         ' Create a new Button control.
         Dim NewButton As Button = New Button()
         NewButton.Text="Click Me"

         ' Register the event-handling method for the Click event. 
         AddHandler NewButton.Click, AddressOf Button_Click

         ' Add the control to the Controls collection of the
         ' PlaceHolder control. 
         Place.Controls.Clear()
         Place.Controls.Add(NewButton)

      End Sub

      Sub Button_Click(sender as Object, e As EventArgs)

         Message.Text = "Hello World"

      End Sub

   </script>

</head>

<body>

   <form id="form1" runat="server">

      <h3> Button Constructor Example </h3>

      <asp:Placeholder id="Place" 
           runat="server"/>

      <br /><br />

      <asp:Label id="Message" 
           runat="server"/>

   </form>

</body>

</html>

Commenti

Usare questo costruttore per creare e inizializzare una nuova istanza della Button classe.

Si applica a

Vedi anche