Image.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

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

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。

Visual Basic

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls"
 Assembly="Samples.AspNet.VB"
 %>
<%@ Page Language="VB" AutoEventWireup="True"
 %>
<HTML>
    <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="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif"
 
             AlternateText="Microsoft Home" />
            
        </form>
    </body>
</HTML>
<br /><span space="preserve">...</span><br
 />    <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" %>
<HTML>
    <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="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif"
 
              AlternateText="Microsoft Home" />
            
        </form>
    </body>
</HTML>
<br /><span space="preserve">...</span><br />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" %>
<HTML>
    <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="http://www.microsoft.com/homepage/gif/bnr-microsoft.gif"
 
              AlternateText="Microsoft Home" />
            
        </form>
    </body>
</HTML>
<br /><span space="preserve">...</span><br />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