LinkButton.AddParsedSubObject(Object) 方法

  • 參考

定義

命名空間:
System.Web.UI.WebControls
組件:
System.Web.dll

通知控制項，項目 (XML 或者 HTML) 已經被剖析，並將項目加入至控制項的 ControlCollection 物件。

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

obj
Object

代表已剖析項目的 Object。

範例

下列程式碼範例示範如何在自訂 LinkButton 伺服器控制項中覆寫 AddParsedSubObject 方法，使它將文字屬性設定為剖析物件的文字屬性、如果剖析的物件是 Literal 物件，或為空字串，否則為空字串。

<%@ 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 LinkButton - AddParsedSubObject - C# Example</title>
    <script runat="server">
      void LinkButton1_Command(Object sender, CommandEventArgs e) 
      {
        // Redirect to the Microsoft home page.
        Response.Redirect("http://www.microsoft.com/");
      }
    </script>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom LinkButton - AddParsedSubObject - C# Example</h3>
            
            <aspSample:CustomLinkButtonAddParsedSubObject 
              id="LinkButton1" 
              runat="server" 
              OnCommand="LinkButton1_Command" 
              ToolTip="Microsoft Home">Microsoft Corp.
            </aspSample:CustomLinkButtonAddParsedSubObject>

        </form>
    </body>
</html>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VS.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 LinkButton - AddParsedSubObject - VB.NET Example</title>
        <script runat="server">
            Sub LinkButton1_Command(sender As Object, e As CommandEventArgs)
                ' Redirect to the Microsoft home page.
                Response.Redirect("http://www.microsoft.com/")
            End Sub
        </script>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom LinkButton - AddParsedSubObject - VB.NET Example</h3>
            
            <aspSample:CustomLinkButtonAddParsedSubObject id="LinkButton1" 
             runat="server" OnCommand="LinkButton1_Command" 
             ToolTip="Microsoft Home">Microsoft Corp.</aspSample:CustomLinkButtonAddParsedSubObject>

        </form>
    </body>
</html>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomLinkButtonAddParsedSubObject : System.Web.UI.WebControls.LinkButton
    {
        protected override void AddParsedSubObject(object obj)
        {
            // If the server control contains any child controls.
            if (this.HasControls()) 
            {
                // Notify the base server control that an element, either XML or HTML, 
                // was parsed, and adds the element to the server control's 
                // ControlCollection object.
                base.AddParsedSubObject(obj);
            }
            else // Else the server control doesn't contain any child controls.
            {
                // If the parsed element is a LiteralControl.
                if (obj is System.Web.UI.LiteralControl) 
                {
                    // Set the server control's Text property to the parsed element's Text value.
                    this.Text = ((System.Web.UI.LiteralControl)obj).Text;
                }
                else // Else the parsed element is not a LiteralControl.
                {
                    // If the server control has a value in the Text property.
                    string currentText = this.Text;
                    if (currentText.Length != 0) 
                    {
                        // Set the server control's Text property to an empty string.
                        this.Text = System.String.Empty;

                        // Notify the base server control that a new LiteralControl was parsed, 
                        // and adds the element to the server control's ControlCollection object.
                        base.AddParsedSubObject(new System.Web.UI.LiteralControl(currentText));
                    }
                    base.AddParsedSubObject(obj);
                }
            }
        }
    }
}

<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomLinkButtonAddParsedSubObject
    Inherits System.Web.UI.WebControls.LinkButton

    Protected Overrides Sub AddParsedSubObject(ByVal obj As Object)

        ' If the server control contains any child controls.
        If Me.HasControls() Then

            ' Notify the base server control that an element, either XML or HTML, 
            ' was parsed, and adds the element to the server control's 
            ' ControlCollection object.
            MyBase.AddParsedSubObject(obj)
            ' Else the server control doesn't contain any child controls.
        Else
            ' If the parsed element is a LiteralControl.
            If TypeOf obj Is System.Web.UI.LiteralControl Then

                ' Set the server control's Text property to the parsed element's Text value.
                Me.Text = CType(obj, System.Web.UI.LiteralControl).Text

                ' Else the parsed element is not a LiteralControl.
            Else
                ' If the server control has a value in the Text property.
                Dim currentText As String = Me.Text
                If currentText.Length <> 0 Then

                    ' Set the server control's Text property to an empty string.
                    Me.Text = System.String.Empty

                    ' Notify the base server control that a new LiteralControl was parsed, 
                    ' and adds the element to the server control's ControlCollection object.
                    MyBase.AddParsedSubObject(New System.Web.UI.LiteralControl(currentText))
                End If
                MyBase.AddParsedSubObject(obj)
            End If
        End If
    End Sub
End Class

適用於

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