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Tags with nilllable and minoccures=0 getting lost in deserialize/serialize

Hi all!

I have run into some strange behaviour in XmlSerializer. (.net 2.0)

1. I have a normal (but quite large) XSD-schema and an XML-file that is
valid.

2. I use xsd.exe to generate classes.

3. I deserialize the xml-file with XmlSerializer.d eserialze() to an
object ( instance from the generated classes)

4. I serialize the object back to xml.

5. Now I have lost all the xml-elements that was marked nillable and
minoccurs=0 in the schema. Even if they were present in the original
xml-file.

6. I expected that a deserialize followed by a serialize wouldn't
loose information.

Some further analysis:
The classes generated by xsd.exe has the property fieldnameSpecif ied
for all fields with minoccurs=0.
During serialize, the serializer checks if fieldnameSpecif ied is true,
otherwise the field is not serialized.
During deserilize fieldnameSpecif ied is ALWAYS set to False if the
field is nillable and minoccurs=0 and as a result of this, WILL NOT be
serialized later on.

Any one out there with any information about this strange behaviour?
Is it normal?
Some workarounds?
Am I missing some important info?
Have a nice weekend!
Regards
/Stefan Vestin

Mar 10 '06 #1
0 1079

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