Html32TextWriter クラスとは? わかりやすく解説

Html32TextWriter クラス

一連の HTML 3.2 固有の文字テキストASP.NET サーバー コントロール出力ストリーム書き込みますHtml32TextWriter クラスには、ASP.NET サーバー コントロールHTML 3.2内容クライアント表示するときに使用する書式設定機能用意されています。

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

Public Class Html32TextWriter
    Inherits HtmlTextWriter
Dim instance As Html32TextWriter
public class Html32TextWriter : HtmlTextWriter
public ref class Html32TextWriter : public
 HtmlTextWriter
public class Html32TextWriter extends HtmlTextWriter
public class Html32TextWriter extends
 HtmlTextWriter
解説解説
使用例使用例

Html32TextWriter クラスから派生した CustomHtml32TextWriter という名前のクラス使用する方法次のコード例示しますCustomHtml32TextWriter は、HtmlTextWriter クラスによって作成されるパターン従った 2 つコンストラクタ作成し、RenderBeforeContent、RenderAfterContent、RenderBeforeTag、および RenderAfterTag の各メソッドオーバーライドしています。

' Create a custom HtmlTextWriter class that overrides 
' the RenderBeforeContent and RenderAfterContent methods.
Imports System
Imports System.IO
Imports System.Web.UI

Namespace Examples.AspNet


   Public Class CustomHtml32TextWriter
      Inherits Html32TextWriter

        ' Create a constructor for the class
        ' that takes a TextWriter as a parameter.
        Public Sub New(ByVal
 writer As TextWriter)
            Me.New(writer, DefaultTabString)
        End Sub

        ' Create a constructor for the class that takes
        ' a TextWriter and a string as parameters. 
        Public Sub New(ByVal
 writer As TextWriter, ByVal tabString As
 String)
            MyBase.New(writer, tabString)
        End Sub

        ' Override the RenderBeforeContent method to render
        ' styles before rendering the content of a <th> element.
        Protected Overrides Function
 RenderBeforeContent() As String
            ' Check the TagKey property. If its value is
            ' HtmlTextWriterTag.TH, check the value of the 
            ' SupportsBold property. If true, return the
            ' opening tag of a <b> element; otherwise, render
            ' the opening tag of a <font> element with a color
            ' attribute set to the hexadecimal value for red.
            If TagKey = HtmlTextWriterTag.Th Then
                If (SupportsBold) Then
                    Return "<b>"
                Else
                    Return "<font color=""FF0000"">"
                End If
            End If

            ' Check whether the element being rendered
            ' is an <H4> element. If it is, check the 
            ' value of the SupportsItalic property.
            ' If true, render the opening tag of the <i> element
            ' prior to the <H4> element's content; otherwise,
 
            ' render the opening tag of a <font> element 
            ' with a color attribute set to the hexadecimal
            ' value for navy blue.
            If TagKey = HtmlTextWriterTag.H4 Then
                If (SupportsItalic) Then
                    Return "<i>"
                Else
                    Return "<font color=""000080"">"
                End If
            End If
            ' Call the base method.
            Return MyBase.RenderBeforeContent()
        End Function

        ' Override the RenderAfterContent method to close
        ' styles opened during the call to the RenderBeforeContent
        ' method.
        Protected Overrides Function
 RenderAfterContent() As String

            ' Check whether the element being rendered is a <th>
 element.
            ' If so, and the requesting device supports bold formatting
,
            ' render the closing tag of the <b> element. If not
,
            ' render the closing tag of the <font> element.
            If TagKey = HtmlTextWriterTag.Th Then
                If SupportsBold Then
                    Return "</b>"
                Else
                    Return "</font>"
                End If
            End If

            ' Check whether the element being rendered is an <H4>.
            ' element. If so, and the requesting device supports italic
            ' formatting, render the closing tag of the <i> element.
            ' If not, render the closing tag of the <font> element.
            If TagKey = HtmlTextWriterTag.H4 Then
                If (SupportsItalic) Then
                    Return "</i>"
                Else
                    Return "</font>"
                End If
            End If
            ' Call the base method.
            Return MyBase.RenderAfterContent()
        End Function

        ' Override the RenderBeforeTag method to render the
        ' opening tag of a <small> element to modify the text
 size of 
        ' any <a> elements that this writer encounters.
        Protected Overrides Function
 RenderBeforeTag() As String
            ' Check whether the element being rendered is an 
            ' <a> element. If so, render the opening tag
            ' of the <small> element; otherwise, call the base
 method.
            If TagKey = HtmlTextWriterTag.A Then
                Return "<small>"
            End If
            Return MyBase.RenderBeforeTag()
        End Function

        ' Override the RenderAfterTag method to render
        ' close any elements opened in the RenderBeforeTag
        ' method call.
        Protected Overrides Function
 RenderAfterTag() As String
            ' Check whether the element being rendered is an
            ' <a> element. If so, render the closing tag of the
            ' <small> element; otherwise, call the base method.
            If TagKey = HtmlTextWriterTag.A Then
                Return "</small>"
            End If
            Return MyBase.RenderAfterTag()
        End Function
    End Class
End Namespace
using System.IO;
using System.Web.UI;

namespace Examples.AspNet
{
    public class CustomHtml32TextWriter : Html32TextWriter
    {
        // Create a constructor for the class
        // that takes a TextWriter as a parameter.
        public CustomHtml32TextWriter(TextWriter writer) 
            : this(writer, DefaultTabString) 
        {
        }

        // Create a constructor for the class that takes
        // a TextWriter and a string as parameters.
        public CustomHtml32TextWriter(TextWriter writer, String
 tabString) 
            : base(writer, tabString)
        {
        }
        
        // Override the RenderBeforeContent method to render
        // styles before rendering the content of a <th> element.
        protected override string RenderBeforeContent()
        {
            // Check the TagKey property. If its value is
            // HtmlTextWriterTag.TH, check the value of the 
            // SupportsBold property. If true, return the
            // opening tag of a <b> element; otherwise, render
            // the opening tag of a <font> element with a color
            // attribute set to the hexadecimal value for red.
            if (TagKey == HtmlTextWriterTag.Th)
            {
                if (SupportsBold)
                    return "<b>";
                else
                    return "<font color=\"FF0000\">";
            }

            // Check whether the element being rendered
            // is an <H4> element. If it is, check the 
            // value of the SupportsItalic property.
            // If true, render the opening tag of the <i> element
            // prior to the <H4> element's content; otherwise,
 
            // render the opening tag of a <font> element 
            // with a color attribute set to the hexadecimal
            // value for navy blue.
            if (TagKey == HtmlTextWriterTag.H4)
            {
                if (SupportsItalic)
                    return "<i>";
                else
                    return "<font color=\"000080\">";
            }
            // Call the base method.
            return base.RenderBeforeContent();
        }

        // Override the RenderAfterContent method to close
        // styles opened during the call to the RenderBeforeContent
        // method.
        protected override string RenderAfterContent()
        {
            // Check whether the element being rendered is a <th>
 element.
            // If so, and the requesting device supports bold formatting
,
            // render the closing tag of the <b> element. If not
,
            // render the closing tag of the <font> element.
            if (TagKey == HtmlTextWriterTag.Th)
            {
                if (SupportsBold)
                    return "</b>";
                else
                    return "</font>";
            }

            // Check whether the element being rendered is an <H4>.
            // element. If so, and the requesting device supports italic
            // formatting, render the closing tag of the <i> element.
            // If not, render the closing tag of the <font> element.
            if (TagKey == HtmlTextWriterTag.H4)
            {
                if (SupportsItalic)
                    return "</i>";
                else
                    return "</font>";
            }
            // Call the base method
            return base.RenderAfterContent();
        }

        // Override the RenderBeforeTag method to render the
        // opening tag of a <small> element to modify the text
 size of 
        // any <a> elements that this writer encounters.
        protected override string RenderBeforeTag()
        {
            // Check whether the element being rendered is an 
            // <a> element. If so, render the opening tag
            // of the <small> element; otherwise, call the base
 method.
            if (TagKey == HtmlTextWriterTag.A)
                return "<small>";
            return base.RenderBeforeTag();
        }

        // Override the RenderAfterTag method to render
        // close any elements opened in the RenderBeforeTag
        // method call.
        protected override string RenderAfterTag()
        {
            // Check whether the element being rendered is an
            // <a> element. If so, render the closing tag of the
            // <small> element; otherwise, call the base method.
            if (TagKey == HtmlTextWriterTag.A)
                return "</small>";
            return base.RenderAfterTag();
        }
    }
}
.NET Framework のセキュリティ.NET Frameworkセキュリティ
継承階層継承階層
System.Object
   System.MarshalByRefObject
     System.IO.TextWriter
       System.Web.UI.HtmlTextWriter
        System.Web.UI.Html32TextWriter
           System.Web.UI.ChtmlTextWriter
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバ場合は、スレッド セーフであるとは限りません。
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