ListBox.AddAttributesToRender メソッドとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

ListBox.AddAttributesToRender メソッド

このメソッドは、.NET Framework インフラストラクチャをサポートします。独自に作成したコードから直接使用するためのものではありません。

表示する属性のリストに name、size、multiple、および onchange を追加します。

名前空間: System.Web.UI.WebControls
アセンブリ: System.Web (system.web.dll 内)
構文

Visual Basic (宣言)

Protected Overrides Sub
 AddAttributesToRender ( _
    writer As HtmlTextWriter _
)

Visual Basic (使用法)

Dim writer As HtmlTextWriter

Me.AddAttributesToRender(writer)

protected override void AddAttributesToRender
 (
    HtmlTextWriter writer
)

C++

protected:
virtual void AddAttributesToRender (
    HtmlTextWriter^ writer
) override

protected void AddAttributesToRender (
    HtmlTextWriter writer
)

JScript

protected override function AddAttributesToRender
 (
    writer : HtmlTextWriter
)

パラメータ

writer: クライアントに HTML のコンテンツを表示する出力ストリーム。

使用例

カスタムサーバーコントロールの AddAttributesToRender メソッドをオーバーライドして、ListBox のリスト項目テキストが常に太字で表示されるようにする方法のコード例を次に示します。

Visual Basic

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls"
 Assembly="Samples.AspNet.VB"
 %>
<%@ Page Language="VB" AutoEventWireup="True"
 %>
<HTML>
    <HEAD>
        <title>Custom ListBox - AddAttributesToRender -  VB.NET Example</title>
        <script runat="server">
            Sub Page_Load(sender As Object,
 e As EventArgs)
                ListBox1.Items.Add(New ListItem("Item1",
 "Item1"))
                ListBox1.Items.Add(New ListItem("Item2",
 "Item2"))
                ListBox1.Items.Add(New ListItem("Item2",
 "Item2"))
            End Sub
        </script>
    </HEAD>
    <body>
        <form id="Form1" method="post"
 runat="server">
            <h3>Custom ListBox - AddAttributesToRender - VB.NET Example</h3>
            
            <aspSample:CustomListBoxAddAttributesToRender id="ListBox1"
 runat="server" />
        </form>
    </body>
</HTML>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls"
 Assembly="Samples.AspNet.CS" %>
<%@ Page Language="C#" AutoEventWireup="True" %>
<HTML>
    <HEAD>
        <title>Custom ListBox - AddAttributesToRender - C# Example</title>
    <script runat="server">
          private void Page_Load(object sender,
 System.EventArgs e)
      {
        ListBox1.Items.Add(new ListItem("Item1", "Item1"));
        ListBox1.Items.Add(new ListItem("Item2", "Item2"));
        ListBox1.Items.Add(new ListItem("Item2", "Item2"));
      }
    </script>
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom ListBox - AddAttributesToRender - C# Example</h3>
            
            <aspSample:CustomListBoxAddAttributesToRender 
              id="ListBox1" 
              runat="server" />
              
        </form>
    </body>
</HTML>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls"
 Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
    <HEAD>
        <title>Custom ListBox - AddAttributesToRender - VJ# Example</title>
    <script runat="server">
        private void Page_Load(Object sender,
 System.EventArgs e)
        {
            ListBox1.get_Items().Add(new ListItem("Item1",
 "Item1"));
            ListBox1.get_Items().Add(new ListItem("Item2",
 "Item2"));
            ListBox1.get_Items().Add(new ListItem("Item2",
 "Item2"));
        } //Page_Load
    </script>
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom ListBox - AddAttributesToRender - VJ# Example</h3>
            
            <aspSample:CustomListBoxAddAttributesToRender 
              id="ListBox1" 
              runat="server" />
              
        </form>
    </body>
</HTML>

Visual Basic

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

    Protected Overrides Sub
 AddAttributesToRender(ByVal writer As System.Web.UI.HtmlTextWriter)

        ' Show the ListItem text as Bold 
        writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold")

        ' Call the Base's AddAttributesToRender method.
        MyBase.AddAttributesToRender(writer)
    End Sub
End Class

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

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomListBoxAddAttributesToRender
 : System.Web.UI.WebControls.ListBox
  {
    protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter
 writer)
    {
      // Show the ListItem text as Bold 
      writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, "bold");

      // Call the Base's AddAttributesToRender method.
      base.AddAttributesToRender(writer);
    }
  }
}

package Samples.AspNet.JSL.Controls; 

public class CustomListBoxAddAttributesToRender
    extends System.Web.UI.WebControls.ListBox
{
    protected void AddAttributesToRender(System.Web.UI.HtmlTextWriter
 writer)
    {
        // Show the ListItem text as Bold 
        writer.AddStyleAttribute(System.Web.UI.HtmlTextWriterStyle.FontWeight, 
            "bold");
        // Call the Base's AddAttributesToRender method.
        super.AddAttributesToRender(writer);
    } //AddAttributesToRender
} //CustomListBoxAddAttributesToRender