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Html32TextWriter Costruttori

Definizione

Inizializza una nuova istanza della classe Html32TextWriter.

Overload

Html32TextWriter(TextWriter)

Inizializza una nuova istanza della classe Html32TextWriter che utilizza il rientro della riga specificato nel campo DefaultTabString quando il browser richiedente necessita di rientri di riga.

Html32TextWriter(TextWriter, String)

Consente di inizializzare una nuova istanza della classe Html32TextWriter che utilizza il rientro della riga specificato.

Html32TextWriter(TextWriter)

Inizializza una nuova istanza della classe Html32TextWriter che utilizza il rientro della riga specificato nel campo DefaultTabString quando il browser richiedente necessita di rientri di riga.

public:
 Html32TextWriter(System::IO::TextWriter ^ writer);
public Html32TextWriter (System.IO.TextWriter writer);
new System.Web.UI.Html32TextWriter : System.IO.TextWriter -> System.Web.UI.Html32TextWriter
Public Sub New (writer As TextWriter)

Parametri

writer
TextWriter

TextWriter che esegue il rendering del contenuto HMTL.

Esempio

Nell'esempio di codice seguente viene illustrato come usare una classe personalizzata che deriva dalla Html32TextWriter classe . Dispone di due costruttori, che è standard per tutte le classi che derivano direttamente o indirettamente dalla HtmlTextWriter classe .

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();
        }
    }
}
' Create a custom HtmlTextWriter class that overrides 
' the RenderBeforeContent and RenderAfterContent methods.
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

Commenti

Il Html32TextWriter costruttore passa il valore del DefaultTabString campo a una seconda versione con i due parametri seguenti:

  • writer, che accetta un'istanza della TextWriter classe .

  • tabString, che accetta una stringa che definisce il rientro della riga.

Si applica a

Html32TextWriter(TextWriter, String)

Consente di inizializzare una nuova istanza della classe Html32TextWriter che utilizza il rientro della riga specificato.

public:
 Html32TextWriter(System::IO::TextWriter ^ writer, System::String ^ tabString);
public Html32TextWriter (System.IO.TextWriter writer, string tabString);
new System.Web.UI.Html32TextWriter : System.IO.TextWriter * string -> System.Web.UI.Html32TextWriter
Public Sub New (writer As TextWriter, tabString As String)

Parametri

writer
TextWriter

TextWriter che esegue il rendering del contenuto HMTL 3.2.

tabString
String

Stringa che rappresenta il numero di spazi definito dalla proprietà Indent.

Esempio

Nell'esempio di codice seguente viene illustrato come usare una classe personalizzata che deriva dalla Html32TextWriter classe . Dispone di due costruttori, che è standard per tutte le classi che derivano direttamente o indirettamente dalla HtmlTextWriter classe .

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();
        }
    }
}
' Create a custom HtmlTextWriter class that overrides 
' the RenderBeforeContent and RenderAfterContent methods.
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

Vedi anche

Si applica a