WebMethod returning an XmlDocument generating a compile error in the client.

[Thirsty Traveler]

I have a WebMethod as follows:

[WebMethod]
public XmlDocument OrderContract(X mlDocument doc)
{
return OrderBLL.OrderC ontract(doc);
}

However, the client is generating a compile error when the following lines
are used:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlDocument retxml = txn.OrderContra ctCert(xml);

However, this compiles clean:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlNode retxml = txn.OrderContra ctCert(xml);

I have no idea why the client is expecting an XmlNode.

[Martin Honnen]

Thirsty Traveler wrote:

However, the client is generating a compile error when the following lines
are used:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlDocument retxml = txn.OrderContra ctCert(xml);

However, this compiles clean:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlNode retxml = txn.OrderContra ctCert(xml);

I have no idea why the client is expecting an XmlNode.

Does it work if you cast the result? E.g.
XmlDocument retxml = txn.OrderContra ctCert(xml) as XmlDocument;
if (retxml != null) {
// now use retxml here
}

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Marc Gravell]

IIRC the cast won't work; it returns a node, not a document.

If you need a document reference, then create a new XmlDocument and
call ImportNode on it to clone that node into the new document.
Alternatively, see what OwnerDocument (on the XmlNode) says.

Marc

[Thirsty Traveler]

I am still unclear on why it is returning a node rather than a document when
the webmethod specifies XmlDocument as the return type.

"Marc Gravell" <ma**********@g mail.com> wrote in message
news:11******** **************@ c74g2000cwc.goo glegroups.com.. .

IIRC the cast won't work; it returns a node, not a document.

If you need a document reference, then create a new XmlDocument and
call ImportNode on it to clone that node into the new document.
Alternatively, see what OwnerDocument (on the XmlNode) says.

Marc

[Martin Honnen]

Marc Gravell wrote:

IIRC the cast won't work; it returns a node, not a document.
XmlNode is an astract class, somehow an instance of a derived class
needs to be returned, and XmlDocument is a derived class. But you are
right that the cast to XmlDocument does not work, a test here shows that
NodeType gives Element node so you could cast to XmlElement but not
XmlDocument.
Alternatively, see what OwnerDocument (on the XmlNode) says.

The OwnerDocument of the node returned is an XmlDocument instance but in
my test here (with .NET 1.1) does not even contain the node returned.
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Martin Honnen]

Thirsty Traveler wrote:

I am still unclear on why it is returning a node rather than a document when
the webmethod specifies XmlDocument as the return type.

Web services communicate using SOAP and it seems any XmlNode sub type is
simply serialized in the SOAP message so it is kind of hard to decide on
the client side what concrete type the XmlNode had.

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[chanmm]

Try this:
OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlDocument retxml = (XmlDocument) txn.OrderContra ctCert(xml);

Does it work for you?

chanmm

"Thirsty Traveler" <nf*@nospam.com > wrote in message
news:%2******** ********@TK2MSF TNGP04.phx.gbl. ..

I have a WebMethod as follows:

[WebMethod]
public XmlDocument OrderContract(X mlDocument doc)
{
return OrderBLL.OrderC ontract(doc);
}

However, the client is generating a compile error when the following lines
are used:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlDocument retxml = txn.OrderContra ctCert(xml);

However, this compiles clean:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlNode retxml = txn.OrderContra ctCert(xml);

I have no idea why the client is expecting an XmlNode.

[Thirsty Traveler]

Unfortunately, that is one of the first things I tried and it did not work.

"chanmm" <ch*****@hotmai l.com> wrote in message
news:uq******** ******@TK2MSFTN GP02.phx.gbl...

Try this:
OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlDocument retxml = (XmlDocument) txn.OrderContra ctCert(xml);

Does it work for you?

chanmm

"Thirsty Traveler" <nf*@nospam.com > wrote in message
news:%2******** ********@TK2MSF TNGP04.phx.gbl. ..

I have a WebMethod as follows:

[WebMethod]
public XmlDocument OrderContract(X mlDocument doc)
{
return OrderBLL.OrderC ontract(doc);
}

However, the client is generating a compile error when the following
lines are used:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlDocument retxml = txn.OrderContra ctCert(xml);

However, this compiles clean:

OrderWS.Contrac tServices txn = new OrderWS.Contrac tServices ();
XmlNode retxml = txn.OrderContra ctCert(xml);

I have no idea why the client is expecting an XmlNode.

[Martin Honnen]

Thirsty Traveler wrote:

Unfortunately, that is one of the first things I tried and it did not work.

It seems (at least with .NET 1.1 from tests) that you get an XmlElement
instead of an XmlDocument so you could use e.g.
XmlNode retxml = txn.OrderContra ctCert(xml);
XmlDocument doc = retxml.OwnerDoc ument;
doc.AppendChild (retxml);
and then you can use doc as an XmlDocument.
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/