PRB: Análisis de XML con el carácter no válido puede elevar ArgumentException

• 0 x 13 está fuera de los caracteres del intervalo válido de XML, por lo tanto se inicia XmlException. Caracteres válidos son:
  # x 9 | # XA | # xd | [# x 20 # xD7FF] | [# xE000-#xFFFD] | [# x 10000 # x10FFFF]
• 0xE9 es un carácter XML válido, sin embargo, es más allá del intervalo definido por el US-ASCII codificación. Por lo tanto, se produce una excepción ArgumentException.

Volver al principio

Pasos para reproducir el comportamiento

1. En Microsoft Visual Studio. NET, cree un nuevo proyecto de aplicación de consola de .NET en Visual Basic.
2. Pegue el código siguiente en la ventana de código:

   Imports System.Xml
   Imports System.IO
   
   Module Module1
   
       Sub Main()
           Dim xDoc As XmlDocument = New XmlDocument()
   
           'Create XML string containing invalid XML character 0x13
           Dim badData As String = "<?xml version='1.0'?>" & _
                                   "<Data>" & Chr(19) & "</Data>"
   
           'Create byte to insert into stream, set byte equal to 
           'invalid US - ASCII character 0xE9
           Dim byteval As Byte = Byte.Parse("233")
   
   
           Dim stream As MemoryStream = New MemoryStream()
   
           'Create objects that will generate stream. You must use BinaryWriter to insert the invalid character, because StreamWriter would
           'insert a unicode character.  
           Dim swriter As StreamWriter = New StreamWriter(stream, System.Text.Encoding.ASCII)
           Dim bwriter As BinaryWriter = New BinaryWriter(stream, System.Text.Encoding.ASCII)
   
           'Write the first part of the XML instance to the stream.
           swriter.Write("<?xml version='1.0'?>" & _
                                   "<Data>")
           swriter.Flush()
   
           'Write invalid character to stream.
           bwriter.Write(byteval)
           bwriter.Flush()
   
           'Write the rest of the XML to the stream.
           swriter.Write("</Data>")
           swriter.Flush()
           stream.Position = 0
   
           Try
               'Demonstrate an XmlException being raised.
               xDoc.LoadXml(badData)
               Console.Write(xDoc.OuterXml)
           Catch xmlEx As XmlException
               Console.WriteLine("This is an XmlException: " & xmlEx.Message)
           Catch argEx As ArgumentException
               Console.WriteLine("This is an ArgumentException: " & argEx.Message)
           End Try
   
           Try
               'Demonstrate an ArgumentException being raised.
               xDoc.Load(stream)
               Console.Write(xDoc.OuterXml)
           Catch xmlEx As XmlException
               Console.WriteLine("This is an XmlException: " & xmlEx.Message)
           Catch argEx As ArgumentException
               Console.WriteLine("This is an ArgumentException: " & argEx.Message)
           End Try
   
           Console.ReadLine()
       End Sub
   
   End Module
   					

3. Ejecute la aplicación.

This is an XmlException: '', hexadecimal value 0x13, is an invalid character. Line 1, position 28.
				

Volver al principio