Html32TextWriter C#

Writes a series of HTML 3.2–specific characters and text to the output stream for an ASP.NET server control. The Html32TextWriter class provides formatting capabilities that ASP.NET server controls use when rendering HTML 3.2 content to clients.

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();

  }
 }
}