TextBox-Konstruktor
Initialisiert eine neue Instanz der TextBox-Klasse.
Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)
Syntax
'Declaration
Public Sub New
'Usage
Dim instance As New TextBox
public TextBox ()
public:
TextBox ()
public TextBox ()
public function TextBox ()
Hinweise
Mit diesem Konstruktor können Sie eine neue Instanz der TextBox-Klasse erstellen und initialisieren.
In der folgenden Tabelle ist der anfängliche Eigenschaftenwert für eine Instanz von TextBox aufgeführt.
Eigenschaft |
Anfangswert |
|---|---|
TagKey |
HtmlTextWriterTag.Input |
Beispiel
Im folgenden Codebeispiel wird veranschaulicht, wie der Seite mit dem TextBox-Konstruktor dynamisch ein TextBox-Steuerelement hinzugefügt wird.
<%@ Page Language="VB" AutoEventWireup="True" %>
<html>
<head>
<script runat="server">
Protected Sub Page_Load(sender As Object, e As EventArgs)
' Create UserTextBox TextBox control.
Dim UserTextBox As New TextBox()
' Configure the UserTextBox TextBox control.
UserTextBox.ID = "UserTextBox"
UserTextBox.Columns = 50
' Add UserTextBox TextBox control to the Controls collection
' of the TextBoxControlPlaceHolder PlaceHolder control.
TextBoxControlPlaceHolder.Controls.Add(UserTextBox)
End Sub
Protected Sub Submit_Click(sender As Object, e As EventArgs)
' Retrieve the UserTextBox TextBox control from the TextBoxControlPlaceHolder
' PlaceHolder control.
Dim TempTextBox As TextBox = CType(TextBoxControlPlaceHolder.FindControl("UserTextBox"), TextBox)
' Display the Text property.
Message.Text = "The TextBox control above is dynamically generated. <br> You entered: " & _
TempTextBox.Text
End Sub
</script>
</head>
<body>
<form runat="server">
<h3> TextBox Constructor Example </h3>
Enter some text and click the Submit button. <br><br>
<asp:PlaceHolder ID="TextBoxControlPlaceHolder"
runat="server"/>
<br><br>
<asp:Button ID="SubmitButton"
Text="Submit"
OnClick="Submit_Click"
runat="server"/>
<br><br>
<asp:Label ID="Message"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="C#" AutoEventWireup="True" %>
<html>
<head>
<script runat="server">
protected void Page_Load(Object sender, EventArgs e)
{
// Create UserTextBox TextBox control.
TextBox UserTextBox = new TextBox();
// Configure the UserTextBox TextBox control.
UserTextBox.ID = "UserTextBox";
UserTextBox.Columns = 50;
// Add UserTextBox TextBox control to the Controls collection
// of the TextBoxControlPlaceHolder PlaceHolder control.
TextBoxControlPlaceHolder.Controls.Add(UserTextBox);
}
protected void Submit_Click(Object sender, EventArgs e)
{
// Retrieve the UserTextBox TextBox control from the TextBoxControlPlaceHolder
// PlaceHolder control.
TextBox TempTextBox = (TextBox)TextBoxControlPlaceHolder.FindControl("UserTextBox");
// Display the Text property.
Message.Text = "The TextBox control above is dynamically generated. <br> You entered: " +
TempTextBox.Text;
}
</script>
</head>
<body>
<form runat="server">
<h3> TextBox Constructor Example </h3>
Enter some text and click the Submit button. <br><br>
<asp:PlaceHolder ID="TextBoxControlPlaceHolder"
runat="server"/>
<br><br>
<asp:Button ID="SubmitButton"
Text="Submit"
OnClick="Submit_Click"
runat="server"/>
<br><br>
<asp:Label ID="Message"
runat="server"/>
</form>
</body>
</html>
Plattformen
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0
Siehe auch
Referenz
TextBox-Klasse
TextBox-Member
System.Web.UI.WebControls-Namespace
TagKey