Serializing of inherited Classes

[iucon]

Hello.

I'm trying to serialize an inherited Class by a Webservice. Here ist a
Code-Snippet of the Classes I try to serialize:

// Base-Class
public class Test
{
private string _Argument1;
public string Argument1
{
get { return _Argument1; }
set { _Argument1 = value; }
}
}

// Inherited Class
public class TestEx : Test
{
private string _Argument2;
public string Argument2
{
get { return _Argument2; }
set { _Argument2 = value; }
}
}

Now I try to return the Base-Class by a WebService:

[WebMethod]
[XmlInclude(typeof(Test))]
public Test ReturnTest()
{
TestEx testEx = new TestEx();
testEx.Argument1 = "Arg1";
testEx.Argument2 = "Arg2";

return (Test) testEx;
}

But this code throws an Exception: The Type inheritanceText.TextEx was
expected.

If I change the XMLInclude-Attribute to [XmlInclude(typeof(TestEx))], no
Exception is thrown, but the Webservice returns TestEx-Object. But I want the
Base-Class returned ...

What am I doing wrong?

Thanks in advance,

Björn Schwemmer

--
iucon GmbH
Software Developement
http://www.iucon.de

[Kevin Yu [MSFT]]

Hi,

First of all, I would like to confirm my understanding of your issue. From
your description, I understand that when you specify the base class to
XmlIncludeAttribute, an exception was thrown. If there is any
misunderstanding, please feel free to let me know.

According to the XmlIncludeAttribute document, when applying the
XmlIncludeAttribute, we have to specify the Type of the derived class. When
the XmlSerializer serializes objects that include both the base and the
derived class, it can then recognize both object types.

This is by design. So in this case, we have to specify the actual object
type and do the cast when you get it at the client side.

Please check the following link for more information.

http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfsystemxmlserializationxmlincludeattributeclas stopic.asp

HTH.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."

[iucon]

Hi.

Thanks for your fast reply.

You understand my issue right. I want to return my base class at the
WebService-Method: "public Test ReturnTest()". Due to security reasons, I
dont want to pass Arguments from the derived class (TestEx) to the client.
Thats why I tried to cast TextEx back to its base class: "return (Test)
testEx;" at server side.

Is there any chance to cast the derived class (TestEx) to the base class
(Test) at server side and pass it to the client?

Thanks in advance,

Björn Schwemmer

--
iucon GmbH
Software Developement
http://www.iucon.de

[Kevin Yu [MSFT]]

Hi,

As far as I know, we cannot return the object as base class automatically.
Because the web service will serialize the object as the base class, so
that exceptions are generated. To cut all the derived class members, the
only way I can see is to construct a new base class object and assign
values to it. Then return the new object client.

HTH.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."

[iucon]

--
iucon GmbH
Software Developement
http://www.iucon.de
"Kevin Yu [MSFT]" wrote:

Hi,

As far as I know, we cannot return the object as base class automatically.
Because the web service will serialize the object as the base class, so
that exceptions are generated. To cut all the derived class members, the
only way I can see is to construct a new base class object and assign
values to it. Then return the new object client.

HTH.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."

[iucon]

Thanks for your answer.

Then I will create a new Object and copy the Attributes.

Regards,

Björn Schwemmer

[Kevin Yu [MSFT]]

You're welcome.

Thanks for sharing your experience with all the people here. If you have
any questions, please feel free to post them in the community.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."