Invalid high surrogate character (0xDEB6).

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David Thielen - 07 Feb 2008 01:25 GMT

I am building an XML document using the standard calls to create elements and
attributes. Occasionally I get the following when calling xmlDoc.OuterXml.
What's going on and how do I avoid this?

System.ArgumentException occurred
Message="Invalid high surrogate character (0xDEB6). A high surrogate
character must have a value from range (0xD800 - 0xDBFF)."
Source="System.Xml"
StackTrace:
at System.Xml.XmlTextEncoder.Write(String text)
at System.Xml.XmlTextWriter.WriteString(String text)
at System.Xml.XmlText.WriteTo(XmlWriter w)
at System.Xml.XmlAttribute.WriteContentTo(XmlWriter w)
at System.Xml.XmlAttribute.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlDocument.WriteContentTo(XmlWriter xw)
at System.Xml.XmlDocument.WriteTo(XmlWriter w)
at System.Xml.XmlNode.get_OuterXml()
at net.windward.autotag.DocumentDataBuffer.SaveProfileToDoc(DocGlobal
docData, String docFileName) in
C:\src\kahuna\AutoTag\AutoTagCore\net\windward\autotag\DocumentDataBuffer.cs:line 116

Signature

thanks - dave
david_at_windward_dot_net
http://www.windwardreports.com

Cubicle Wars - http://www.windwardreports.com/film.htm

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Steven Cheng[MSFT] - 07 Feb 2008 04:54 GMT

Hi Dave,

As for the "Invalid high surrogate character" error you encountered, it is
due to some Unicode specific validation in .NET XML API. Within the .Net
framework, there are lot of string validations for Unicode, not only for
XML. So, this is the correct behaviour.The problem is that the data in the
XML you generated may contains some certain value that is valid in string
or XML, but not valid for UNICODE(utf-16 which has rules for surrogate).

From some former issue, I found that you may encounter this error when
you've encrypted some of the data in the xml which may cause the generated
value be invalid according to unicode surrogate pair rules. Is there any
particular data included in your XML document? You can try simplify the XML
document so as to locate the certain data fragment.

BTW, here is a blog article I've found which also mentioned this:

http://blogs.msdn.com/michkap/archive/2006/12/05/1212917.aspx

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

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--------------------

>From: =?Utf-8?B?RGF2aWQgVGhpZWxlbg==?= <thielen@nospam.nospam>
>Subject: Invalid high surrogate character (0xDEB6).
>Date: Wed, 6 Feb 2008 17:25:01 -0800

>I am building an XML document using the standard calls to create elements and
>attributes. Occasionally I get the following when calling xmlDoc.OuterXml.
[quoted text clipped - 27 lines]
> at System.Xml.XmlNode.get_OuterXml()
> at

net.windward.autotag.DocumentDataBuffer.SaveProfileToDoc(DocGlobal

>docData, String docFileName) in
>C:\src\kahuna\AutoTag\AutoTagCore\net\windward\autotag\DocumentDataBuffer.cs:line 116

Reply to this Message

David Thielen - 07 Feb 2008 05:05 GMT

My problem is I don't control the text that goes in many of the nodes &
attributes. Should I be encoding the text somehow? I assumed using the
XmlDocument methods that it would handle any necessary encoding.

Also, all of the text added in this case is ASCII.

Signature

thanks - dave
david_at_windward_dot_net
http://www.windwardreports.com

Cubicle Wars - http://www.windwardreports.com/film.htm

> Hi Dave,
>
[quoted text clipped - 88 lines]
> >C:\src\kahuna\AutoTag\AutoTagCore\net\windward\autotag\DocumentDataBuffer.c
> s:line 116

Reply to this Message

Steven Cheng[MSFT] - 08 Feb 2008 05:11 GMT

Thanks for your reply Dave,

I think it would be better to identify those nodes that may contains the
pontential problemtic data. Sure, you can perform an additional encoding on
the data so as to ensure it is proper unicode text range.

As you mentioned that all the data is of ASCII char, how were those ASCII
chars generated and embeded into the XML document?

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------

>From: =?Utf-8?B?RGF2aWQgVGhpZWxlbg==?= <thielen@nospam.nospam>
>References: <BEFB912D-04CF-4210-BEA8-5CBA8964E270@microsoft.com>

<JT7PTWUaIHA.1500@TK2MSFTNGHUB02.phx.gbl>

>Subject: RE: Invalid high surrogate character (0xDEB6).
>Date: Wed, 6 Feb 2008 21:05:01 -0800

>My problem is I don't control the text that goes in many of the nodes &
>attributes. Should I be encoding the text somehow? I assumed using the
[quoted text clipped - 32 lines]
>>
>> Get notification to my posts through email? Please refer to

http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif

>> ications.
>>
[quoted text clipped - 58 lines]
>C:\src\kahuna\AutoTag\AutoTagCore\net\windward\autotag\DocumentDataBuffer.c
>> s:line 116

Reply to this Message

Invalid high surrogate character (0xDEB6).

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