TextBox.AddParsedSubObject(Object) 方法
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。
被覆寫,以僅允許常值 (Literal) 控制項做為 Text 屬性加入。
protected:
override void AddParsedSubObject(System::Object ^ obj);
protected override void AddParsedSubObject (object obj);
override this.AddParsedSubObject : obj -> unit
Protected Overrides Sub AddParsedSubObject (obj As Object)
參數
例外狀況
obj
不是 LiteralControl 型別。
範例
下列程式碼範例示範如何在自訂伺服器控制項中覆寫 AddParsedSubObject 方法,如此一來,如果剖析的物件是控制項,則它一律會將 屬性設定 Text 為 Literal 剖析物件的 Text
屬性,否則會擲回例外狀況。
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)。
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<%@ 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>Custom TextBox - AddParsedSubObject - C# Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom TextBox - AddParsedSubObject - C# Example</h3>
<aspSample:CustomTextBoxAddParsedSubObject
id="TextBox1"
runat="server">Hello World!
</aspSample:CustomTextBoxAddParsedSubObject>
</form>
</body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ 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>Custom TextBox - AddParsedSubObject - VB.NET Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom TextBox - AddParsedSubObject - VB.NET Example</h3>
<aspSample:CustomTextBoxAddParsedSubObject id="TextBox1"
runat="server">Hello World!</aspSample:CustomTextBoxAddParsedSubObject>
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Controls
{
[AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomTextBoxAddParsedSubObject : System.Web.UI.WebControls.TextBox
{
protected override void AddParsedSubObject(object obj)
{
// If the object is a LiteralControl, then set this control's Text property.
if (obj is System.Web.UI.LiteralControl)
{
this.Text = ((System.Web.UI.LiteralControl)obj).Text;
}
else
{
throw new System.Web.HttpException("You cannot have a child control of type " + obj.GetType().Name.ToString());
}
}
}
}
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Controls
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomTextBoxAddParsedSubObject
Inherits System.Web.UI.WebControls.TextBox
Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)
' If the object is a LiteralControl, then set this control's Text property.
If TypeOf obj Is System.Web.UI.LiteralControl Then
Me.Text = CType(obj, System.Web.UI.LiteralControl).Text
Else
Throw New System.Web.HttpException("You cannot have children controls of type " + obj.GetType().Name.ToString())
End If
End Sub
End Class
End Namespace
適用於
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