Html32TextWriter Construtores
Definição
Importante
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Inicializa uma nova instância da classe Html32TextWriter.
Sobrecargas
| Html32TextWriter(TextWriter) |
Inicializa uma nova instância da classe Html32TextWriter que usa o recuo de linha especificado no campo DefaultTabString quando o navegador solicitante requer recuo de linha. |
| Html32TextWriter(TextWriter, String) |
Inicializa uma nova instância da classe Html32TextWriter que usa o recuo de linha especificado. |
Html32TextWriter(TextWriter)
Inicializa uma nova instância da classe Html32TextWriter que usa o recuo de linha especificado no campo DefaultTabString quando o navegador solicitante requer recuo de linha.
public:
Html32TextWriter(System::IO::TextWriter ^ writer);public Html32TextWriter (System.IO.TextWriter writer);new System.Web.UI.Html32TextWriter : System.IO.TextWriter -> System.Web.UI.Html32TextWriterPublic Sub New (writer As TextWriter)Parâmetros
- writer
- TextWriter
O TextWriter que renderiza o conteúdo HTML.
Exemplos
O exemplo de código a seguir demonstra como usar uma classe personalizada derivada da Html32TextWriter classe . Ele tem dois construtores, que é padrão para todas as classes que derivam direta ou indiretamente da 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
Comentários
O Html32TextWriter construtor passa o valor do DefaultTabString campo para uma segunda versão que tem os dois parâmetros a seguir:
writer, que usa uma instância da TextWriter classe .tabString, que usa uma cadeia de caracteres que define o recuo de linha.
Aplica-se a
Html32TextWriter(TextWriter, String)
Inicializa uma nova instância da classe Html32TextWriter que usa o recuo de linha especificado.
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.Html32TextWriterPublic Sub New (writer As TextWriter, tabString As String)Parâmetros
- writer
- TextWriter
O TextWriter que renderiza o conteúdo HTML 3.2.
Exemplos
O exemplo de código a seguir demonstra como usar uma classe personalizada derivada da Html32TextWriter classe . Ele tem dois construtores, que é padrão para todas as classes que derivam direta ou indiretamente da 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
Confira também
Aplica-se a
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