[Mono-list] Xml Entity Resolution

[Atsushi Eno]

Oh, ok I thought that if such behavior really happens it must be my
bug on XmlTextReader2 (if it cannot resolve entity due to null
XmlResolver then CanResolveEntity must be false), but looks like
that is the .NET behavior. So, under .NET 2.0 your solution is the
right answer.

Atsushi Eno

colin at breame.net wrote:
> Maybe I am misunderstanding you - see the code below.  When compiled
> with gmcs, it throws the XmlException (but not when compiled with mcs -
> is this a difference between XmlTextReader vs. XmlTextReader2?) 
> XmlTextReader2.Read calls ResolveEntity directly.
> 
> C.
> 
> using System;
> using System.IO;
> using System.Xml;
> 
> public class test_t {
>   public static void Main() {
>     TextReader sreader = new StringReader("<doc>&unknown;</doc>");
>     XmlTextReader reader = new XmlTextReader(sreader);
>     reader.XmlResolver = null;
>     XmlDocument doc = new XmlDocument();
>     while (!reader.EOF) {
>       doc.AppendChild (doc.ReadNode (reader));
>     }
>   }
> }
> 
> 
> On Wed, 07 Mar 2007 16:06:04 +0900, "Atsushi Eno" <atsushi at ximian.com>
> said:
>> Well, you are confused. You can't use XmlDocument.Load() even with
>> your blablaXmlReader. XmlTextReader.XmlResolver = null is just a
>> replacement to your class. The workaround (using ReadNode method)
>> is *still* required.
>>
>> To summarize technical side:
>> - XmlDocument.Load() does need corresponding entity declarations
>> - XmlTextReader does not need corresponding entity.
>> - XmlTextReader does not ignore external DTD unless null XmlResolver
>>    is set.
>>
>> Atsushi Eno
>>
>> colin at breame.net wrote:
>>> Tried that (see below) but it still gets "System.Xml.XmlException:
>>> Reference to undeclared entity" exceptions.
>>>
>>> Thanks again,
>>> C.
>>>
>>> XmlDocument doc = new XmlDocument();
>>> XmlTextReader reader = new XmlTextReader(new
>>> StringReader(xml_text_with_entities));
>>> reader.XmlResolver = null;
>>> doc.Load(reader);
>>>
>>> On Tue, 06 Mar 2007 06:07:02 +0900, "Atsushi Eno" <atsushi at ximian.com>
>>> said:
>>>> Well, you could just try XmlTextReader.XmlResolver = null here ...
>>>>
>>>> Atsushi Eno
>>>>
>>>> Colin John Nicholas Breame wrote:
>>>>> Hi,
>>>>>
>>>>> I've tried your solution with both XmlTextReader and XmlValidatingReader
>>>>> but I can't make it work.  The problem is that the XmlTextReader
>>>>> actually requires entities to be resolved.
>>>>>
>>>>> As a work around I've subclassed XmlTextReader to return false for
>>>>> CanResolveEntity, which seems to (at least initially) do the trick.  See
>>>>> below.
>>>>>
>>>>> Thanks
>>>>> C.
>>>>>
>>>>> using System.IO;
>>>>> using System.Xml;
>>>>>
>>>>> public class NonEntityResolvingXmlTextReader : XmlTextReader {
>>>>>   public NonResolvingXmlTextReader(TextReader reader) : base(reader) {
>>>>>   }
>>>>>
>>>>>   public override bool CanResolveEntity {
>>>>>     get {
>>>>>       return false;
>>>>>     }
>>>>>   }
>>>>> }
>>>>>
>>>>>
>>>>> On Mon, 05 Mar 2007 14:00:00 +0900, "Atsushi Eno" <atsushi at ximian.com>
>>>>> said:
>>>>>> Hi,
>>>>>>
>>>>>> If you skip the DTD, any entity references (except for &lt;, &gt;, 
>>>>>> &apos; and &quot;) are rejected during XmlDocument.Load().
>>>>>>
>>>>>> If you don't care such buggy document, you can try
>>>>>>
>>>>>> 	while (!reader.EOF)
>>>>>> 		doc.AppendChild (doc.ReadNode (reader));
>>>>>>
>>>>>> which does not reject unresolved entity references (funny, but
>>>>>> this is what .net System.Xml.dll does).
>>>>>>
>>>>>> Atsushi Eno
>>>>>>
>>>>>> colin at breame.net wrote:
>>>>>>> I'm trying to turn off entity resolution using XmlDocument as I don't
>>>>>>> have a DTD and I'm getting "System.Xml.XmlException: Cannot resolve
>>>>>>> entity without DTD".  I can't see an explicit "ResolveEntity" property I
>>>>>>> could set to off.  Any ideas?  Is there a mono specific way of doing
>>>>>>> this?
>>>>>>>
>>>>>>> Thanks
>>>>>>> Colin.
>>>>>>> _______________________________________________
>>>>>>> Mono-list maillist  -  Mono-list at lists.ximian.com
>>>>>>> http://lists.ximian.com/mailman/listinfo/mono-list
>>>>>>>
>>>>>> _______________________________________________
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