Image.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。

Image の属性を、クライアントに表示する出力ストリームに追加します。

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

構文

'宣言
Protected Overrides Sub AddAttributesToRender ( _
    writer As HtmlTextWriter _
)
'使用
Dim writer As HtmlTextWriter

Me.AddAttributesToRender(writer)

protected override void AddAttributesToRender (
    HtmlTextWriter writer
)

protected:
virtual void AddAttributesToRender (
    HtmlTextWriter^ writer
) override

protected void AddAttributesToRender (
    HtmlTextWriter writer
)

protected override function AddAttributesToRender (
    writer : HtmlTextWriter
)

適用できません。

パラメータ

writer
クライアントのブラウザに表示する出力ストリームを格納している System.Web.UI.HtmlTextWriter。

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、Image を常に細い境界線で表示する方法のコード例を次に示します。

<%@ 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 Image - AddAttributesToRender - VB.NET Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom Image - AddAttributesToRender - VB.NET Example</h3>
            
            <aspSample:CustomImageAddAttributesToRender id="Image1" runat="server" 
             ImageUrl="https://www.microsoft.com/homepage/gif/bnr-microsoft.gif" 
             AlternateText="Microsoft Home" />
            
        </form>
    </body>
</html>
...

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

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

            ' Show the Image with a thin border.
            writer.AddStyleAttribute("border-width", "thin")

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

<%@ 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 Image - AddAttributesToRender - C# Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom Image - AddAttributesToRender - C# Example</h3>
            
            <aspSample:CustomImageAddAttributesToRender 
              id="Image1" 
              runat="server" 
              ImageUrl="https://www.microsoft.com/homepage/gif/bnr-microsoft.gif" 
              AlternateText="Microsoft Home" />
            
        </form>
    </body>
</html>
...

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

namespace Samples.AspNet.CS.Controls
{
    [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
    public sealed class CustomImageAddAttributesToRender : System.Web.UI.WebControls.Image
    {
        protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
        {
            // Show the Image with a thin border.
            writer.AddStyleAttribute("border-width","thin");

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

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" 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 Image - AddAttributesToRender - VJ# Example</title>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom Image - AddAttributesToRender - VJ# Example</h3>
            
            <aspSample:CustomImageAddAttributesToRender 
              id="Image1" 
              runat="server" 
              ImageUrl="https://www.microsoft.com/homepage/gif/bnr-microsoft.gif" 
              AlternateText="Microsoft Home" />
            
        </form>
    </body>
</html>
...

package Samples.AspNet.JSL.Controls; 

public class CustomImageAddAttributesToRender 
    extends System.Web.UI.WebControls.Image
{
    protected void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
    {
        // Show the Image with a thin border.
        writer.AddStyleAttribute("border-width", "thin");
        // Call the Base's AddAttributesToRender method.
        super.AddAttributesToRender(writer);
    } //AddAttributesToRender
} //CustomImageAddAttributesToRender

プラットフォーム

Windows 98,Windows Server 2000 SP4,Windows CE,Windows Millennium Edition,Windows Mobile for Pocket PC,Windows Mobile for Smartphone,Windows Server 2003,Windows XP Media Center Edition,Windows XP Professional x64 Edition,Windows XP SP2,Windows XP Starter Edition

Microsoft .NET Framework 3.0 は Windows Vista,Microsoft Windows XP SP2,および Windows Server 2003 SP1 でサポートされています。

バージョン情報

.NET Framework

サポート対象 : 3.0,2.0,1.1,1.0

参照

その他の技術情報

Image Web サーバーコントロール

Last updated on 2007-06-26