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xml serialization

Ice
All -

I'm pretty comfortable with simple XML serialization of objects. However I
observed something the other day and I wanted to know if I solved it the
right way.

Basically if I have a string which contains a single xml node, I can
serialize with this line of code:

object = (object)serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

where xml is the string that represents the node

However if the string contains two nodes that individually would serialize
to the "object" I have to do the following to be able to serialize to an
array. Code looks like this:

string xml = "<ArrayOfObject >" + xml
+ "</ArrayOfObject>";
object = (object[])serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

If don't concatenate "ArrayOfObject" elements to beginning and end of nodes,
it doesn work. I get the exception "...xmlns = ''" wasn't expected...".
Have I solved this problem correctly, or is there another way to get around
this.
ice
Nov 12 '05 #1
3 2194
Ice,

As you've seen, the XmlSerializer cannot deserialize XML Document
fragments with Arrays correctly -- and glancing through the Rotor source
[0], I couldn't find anything that would generate code that would be
what you are looking for.

Another solution avoiding the string concatenation would be to
deserialize one array item at a time like in the example below:

string xml =
"<MyClass><foo>foobar</foo></MyClass><MyClass><foo>bar</foo></MyClass>";
XmlSerializer ser = new XmlSerializer(typeof(MyClass));

XmlTextReader reader = new XmlTextReader(xml, XmlNodeType.Element,
null);
object o;
ArrayList list = new ArrayList();
MyClass[] objs;

while( false == reader.EOF )
{
o = ser.Deserialize(reader);
list.Add(o);
}
objs = list.ToArray(typeof(MyClass)) as MyClass[];

In the example, I store all the deserialized items in an ArrayList
first, to later convert that to a type array, but you may want to work
with strongly typed collections to avoid the type conversion. You can
create those collections by hand or using a tool like CodeSmith [1].

HTH,
Christoph Schittko
MS MVP XML
http://weblogs.asp.net/cschittko

[0]
http://www.microsoft.com/downloads/d...A1C93FA-7462-4
7D0-8E56-8DD34C6292F0&displaylang=en
[1] http://www.ericjsmith.net/codesmith/
-----Original Message-----
From: Ice [mailto:ic*@nospam.com]
Posted At: Thursday, November 25, 2004 10:08 PM
Posted To: microsoft.public.dotnet.xml
Conversation: xml serialization
Subject: xml serialization

All -

I'm pretty comfortable with simple XML serialization of objects. However I
observed something the other day and I wanted to know if I solved it the right way.

Basically if I have a string which contains a single xml node, I can
serialize with this line of code:

object = (object)serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

where xml is the string that represents the node

However if the string contains two nodes that individually would serialize to the "object" I have to do the following to be able to serialize to an array. Code looks like this:

string xml = "<ArrayOfObject >" + xml
+ "</ArrayOfObject>";
object = (object[])serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

If don't concatenate "ArrayOfObject" elements to beginning and end of
nodes,
it doesn work. I get the exception "...xmlns = ''" wasn't expected...". Have I solved this problem correctly, or is there another way to get
around
this.
ice

Nov 12 '05 #2
Ice
thanks for the reply. your solution also works well. have you used
CodeSmith extensively?

ice
"Christoph Schittko [MVP]" <IN**********@austin.rr.com> wrote in message
news:Os**************@TK2MSFTNGP09.phx.gbl...
Ice,

As you've seen, the XmlSerializer cannot deserialize XML Document
fragments with Arrays correctly -- and glancing through the Rotor source
[0], I couldn't find anything that would generate code that would be
what you are looking for.

Another solution avoiding the string concatenation would be to
deserialize one array item at a time like in the example below:

string xml =
"<MyClass><foo>foobar</foo></MyClass><MyClass><foo>bar</foo></MyClass>";
XmlSerializer ser = new XmlSerializer(typeof(MyClass));

XmlTextReader reader = new XmlTextReader(xml, XmlNodeType.Element,
null);
object o;
ArrayList list = new ArrayList();
MyClass[] objs;

while( false == reader.EOF )
{
o = ser.Deserialize(reader);
list.Add(o);
}
objs = list.ToArray(typeof(MyClass)) as MyClass[];

In the example, I store all the deserialized items in an ArrayList
first, to later convert that to a type array, but you may want to work
with strongly typed collections to avoid the type conversion. You can
create those collections by hand or using a tool like CodeSmith [1].

HTH,
Christoph Schittko
MS MVP XML
http://weblogs.asp.net/cschittko

[0]
http://www.microsoft.com/downloads/d...A1C93FA-7462-4
7D0-8E56-8DD34C6292F0&displaylang=en
[1] http://www.ericjsmith.net/codesmith/
-----Original Message-----
From: Ice [mailto:ic*@nospam.com]
Posted At: Thursday, November 25, 2004 10:08 PM
Posted To: microsoft.public.dotnet.xml
Conversation: xml serialization
Subject: xml serialization

All -

I'm pretty comfortable with simple XML serialization of objects.

However
I
observed something the other day and I wanted to know if I solved it

the
right way.

Basically if I have a string which contains a single xml node, I can
serialize with this line of code:

object = (object)serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

where xml is the string that represents the node

However if the string contains two nodes that individually would

serialize
to the "object" I have to do the following to be able to serialize to

an
array. Code looks like this:

string xml = "<ArrayOfObject >" + xml
+ "</ArrayOfObject>";
object = (object[])serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

If don't concatenate "ArrayOfObject" elements to beginning and end of
nodes,
it doesn work. I get the exception "...xmlns = ''" wasn't

expected...".
Have I solved this problem correctly, or is there another way to get
around
this.
ice


Nov 12 '05 #3
I haven't used it that much personally, but I've worked on a few
projects where it was used quite a bit.

Christoph Schittko
MVP XML
http://weblogs.asp.net/cschittko

-----Original Message-----
From: Ice [mailto:ic*@nospam.com]
Posted At: Sunday, November 28, 2004 10:02 AM
Posted To: microsoft.public.dotnet.xml
Conversation: xml serialization
Subject: Re: xml serialization

thanks for the reply. your solution also works well. have you used
CodeSmith extensively?

ice
"Christoph Schittko [MVP]" <IN**********@austin.rr.com> wrote in message news:Os**************@TK2MSFTNGP09.phx.gbl...
Ice,

As you've seen, the XmlSerializer cannot deserialize XML Document
fragments with Arrays correctly -- and glancing through the Rotor source [0], I couldn't find anything that would generate code that would be
what you are looking for.

Another solution avoiding the string concatenation would be to
deserialize one array item at a time like in the example below:

string xml =
"<MyClass><foo>foobar</foo></MyClass><MyClass><foo>bar</foo></MyClass>"; XmlSerializer ser = new XmlSerializer(typeof(MyClass));

XmlTextReader reader = new XmlTextReader(xml, XmlNodeType.Element,
null);
object o;
ArrayList list = new ArrayList();
MyClass[] objs;

while( false == reader.EOF )
{
o = ser.Deserialize(reader);
list.Add(o);
}
objs = list.ToArray(typeof(MyClass)) as MyClass[];

In the example, I store all the deserialized items in an ArrayList
first, to later convert that to a type array, but you may want to work with strongly typed collections to avoid the type conversion. You can create those collections by hand or using a tool like CodeSmith [1].

HTH,
Christoph Schittko
MS MVP XML
http://weblogs.asp.net/cschittko

[0]
http://www.microsoft.com/downloads/d...A1C93FA-7462-4 7D0-8E56-8DD34C6292F0&displaylang=en
[1] http://www.ericjsmith.net/codesmith/
-----Original Message-----
From: Ice [mailto:ic*@nospam.com]
Posted At: Thursday, November 25, 2004 10:08 PM
Posted To: microsoft.public.dotnet.xml
Conversation: xml serialization
Subject: xml serialization

All -

I'm pretty comfortable with simple XML serialization of objects.

However
I
observed something the other day and I wanted to know if I solved it
the
right way.

Basically if I have a string which contains a single xml node, I
can serialize with this line of code:

object = (object)serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

where xml is the string that represents the node

However if the string contains two nodes that individually would

serialize
to the "object" I have to do the following to be able to serialize to an
array. Code looks like this:

string xml = "<ArrayOfObject >" + xml
+ "</ArrayOfObject>";
object = (object[])serializer.Deserialize(new
XmlTextReader(xml,XmlNodeType.Element,null));

If don't concatenate "ArrayOfObject" elements to beginning and end

of nodes,
it doesn work. I get the exception "...xmlns = ''" wasn't

expected...".
Have I solved this problem correctly, or is there another way to get around
this.
ice


Nov 12 '05 #4

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