Serialisation > ignore element when an attritube is null

[lobrys]

Hi everybody

here is a question

I have this class that a want to serialize :

Public Class BOO
<XmlAttributeAttribute()> Public THING As String
<XmlElementAttribute("param")> Public p() As param
End Class

it is (of course) working with this class :

Public Class PARAM
'I have not put the constructors...
<XmlAttributeAttribute()> Public name As String
<XmlAttributeAttribute()> Public X As String
End Class

You understand that I have a array of Param....
sometimes, in this array, some object PARAM does not have a value for the
attribute X

the serialisation looks like

<BOO THING ="hello girls" >
<param name="john" X="booboo" />
<param name="franck" />
<param name="bob" X="boo" />
</BOO>

here, Franck doesn't have a X value....
I simply want to do not have this line, and obtain :

<BOO THING ="hello girls" >
<param name="john" X="booboo" />
<param name="bob" X="boo" />
</BOO>

someone told me to use custom XmlAttributes ....(If X='' then dont write me)

I dont know how to do...
Is there another ways to do that?

Thanks for your help!

lobrys

[Christoph Schittko [MVP]]

Lobrys,

Attributes will not work here because are trying to exclude individual array
elements based on their content. You cannot attach serialization attributes
to individual array elements.

Your best bet is a wrapper class with a property that exposes the array,
something like (sorry for the C# -- i hope you get the idea):

Warning: Tested in Outlook ;)

public class BooWrapper
{
private BOO b;
public class BooWrapper( BOO otherBoo )
{
b = otherBoo;
}
public Param[] p
{
get
{
ArrayList list = new ArrayList();
for( int i = 0; i < b.p.Length; i++ )
{
if (null != b.p[i].X)
list.Add( b.p[i] );
}

return (Param[]) list.ToArray( typeof( Param ) );
}
set
{
/// TODO
}
}

// TODO: more ...
}
HTH,
Christoph Schittko
Software Architect, .NET Mentor
MS MVP XML .NET

"lobrys" <lo**********@free.fr> wrote in message
news:#$**************@TK2MSFTNGP12.phx.gbl...

Hi everybody

here is a question

I have this class that a want to serialize :

Public Class BOO
<XmlAttributeAttribute()> Public THING As String
<XmlElementAttribute("param")> Public p() As param
End Class

it is (of course) working with this class :

Public Class PARAM
'I have not put the constructors...
<XmlAttributeAttribute()> Public name As String
<XmlAttributeAttribute()> Public X As String
End Class

You understand that I have a array of Param....
sometimes, in this array, some object PARAM does not have a value for the
attribute X

the serialisation looks like

<BOO THING ="hello girls" >
<param name="john" X="booboo" />
<param name="franck" />
<param name="bob" X="boo" />
</BOO>

here, Franck doesn't have a X value....
I simply want to do not have this line, and obtain :

<BOO THING ="hello girls" >
<param name="john" X="booboo" />
<param name="bob" X="boo" />
</BOO>

someone told me to use custom XmlAttributes ....(If X='' then dont write me)
I dont know how to do...
Is there another ways to do that?

Thanks for your help!

lobrys