TextBox 建構函式
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
初始化 TextBox 類別的新執行個體。
public:
TextBox();public TextBox ();Public Sub New ()範例
下列程式代碼範例示範如何使用 建 TextBox 構函式，以動態方式將控件新增 TextBox 至頁面。
重要
這個範例有一個可接受使用者輸入的文字方塊，這可能會造成安全性威脅。 根據預設，ASP.NET Web 網頁會驗證使用者輸入未包含指令碼或 HTML 項目。 如需詳細資訊，請參閱 Script Exploits Overview (指令碼攻擊概觀)。
<%@ 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>
<title> TextBox Constructor Example </title>
<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 id="form1" 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="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>
<title> TextBox Constructor Example </title>
<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 id="form1" 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>
備註
使用此建構函式來建立和初始化 類別的新實例 TextBox 。
下表顯示 實例 TextBox的初始屬性值。
| 屬性 | 初始值 |
|---|---|
TagKey |
HtmlTextWriterTag.Input |
