The following code example demonstrates how to override the OnStyleAttributeRender method to check whether a Color attribute is being rendered for any of the elements that are rendered by this text writer. If a Color attribute is rendered, the code checks whether its value is purple. If the value is purple, the OnStyleAttributeRender method returns false and the attribute and its value are not rendered. If the Color attribute is set to any other value, the OnStyleAttributeRender method returns true and the attribute and its value are rendered. If the key parameter of the OnAttributeRender method does not match the Color attribute, the base functionality of the OnStyleAttributeRender method is called, as defined in the XhtmlTextWriter class.

This code example is part of a larger example provided for the XhtmlTextWriter class.

' Override the OnStyleAttributeRender
' method to prevent this text writer 
' from rendering purple text.
Overrides Protected Function OnStyleAttributeRender(ByVal name As String, _
  ByVal value As String, _
  ByVal key As HtmlTextWriterStyle _
) As Boolean
   If key = HtmlTextWriterStyle.Color Then
      If String.Compare(value, "purple") = 0 Then
         Return False
      Else
         Return True
      End If
   Else
      Return MyBase.OnStyleAttributeRender(name, value, key)        
   End If
End Function  

// Override the OnStyleAttributeRender
// method to prevent this text writer 
// from rendering purple text.
protected override bool OnStyleAttributeRender(string name, 
    string value, 
    HtmlTextWriterStyle key)
{
    if (key == HtmlTextWriterStyle.Color)
    {
        if (String.Compare(value, "purple") == 0)
        {
            return false;
        }
        else
        {
            return true;
        }
    }
    else
    {
        return base.OnStyleAttributeRender(name, value, key);
    }        
}  

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework

Reference