HELP Problem serializing a structure

[~~~ .NET Ed ~~~]

Hello,

I am having a problem trying to serialize this simple structure, I use it
in a collection class that derives from CollectionBase but I noticed that at
least for now the serialization exception ocurrs when i try to serialize
this structure (see below). The idea is that it would be serialized to:

< Param type="..." method="Get" required="true" >something</Param>

I use the following to serialize:

WizarParameter wpar = new WizardParameter (typeof(int),
WizardParameter Method.Get, true, "something" );
StringWriter sw = new StringWriter();
XmlSerializer ser = new XmlSerializer(t ypeof(WizardPar ameter));
ser.Serialize(s w, wpar);

[Serializable]
[XmlRoot("Param" )]
public struct WizardParameter

{

/// The system type contained by this parameter
[XmlAttribute("t ype")]
public System.Type Type;

/// The method that should be used to pass this paramete
[XmlAttribute("m ethod")]
public WizardParameter Method Method; /// enumeration

/// Whether the parameter is required or optional

[XmlAttribute("r equired")]
public bool IsRequired;

[XmlElement("key ")]
public string Key;

public WizardParameter (Type type, WizardParameter Method method, bool
required, string key)

{

this.Type = type;

this.Method = method;

this.IsRequired = required;

this.Key = key;

}

}

[Nicholas Paldino [.NET/C# MVP]]

Ed,

What are the details of the exception? I believe that you can't do this
properly because the XmlSerializer will only access public properties, and
can not access indexers either (which is how you would get the items in the
collection).

You might want to use the SoapFormatter (depending on how readable you
want the content to be).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"~~~ .NET Ed ~~~" <ti*********@ab olishspam.now> wrote in message
news:eO******** ******@TK2MSFTN GP15.phx.gbl...

Hello,

I am having a problem trying to serialize this simple structure, I use
it in a collection class that derives from CollectionBase but I noticed
that at least for now the serialization exception ocurrs when i try to
serialize this structure (see below). The idea is that it would be
serialized to:

< Param type="..." method="Get" required="true" >something</Param>

I use the following to serialize:

WizarParameter wpar = new WizardParameter (typeof(int),
WizardParameter Method.Get, true, "something" );
StringWriter sw = new StringWriter();
XmlSerializer ser = new XmlSerializer(t ypeof(WizardPar ameter));
ser.Serialize(s w, wpar);

[Serializable]
[XmlRoot("Param" )]
public struct WizardParameter

{

/// The system type contained by this parameter
[XmlAttribute("t ype")]
public System.Type Type;

/// The method that should be used to pass this paramete
[XmlAttribute("m ethod")]
public WizardParameter Method Method; /// enumeration

/// Whether the parameter is required or optional

[XmlAttribute("r equired")]
public bool IsRequired;

[XmlElement("key ")]
public string Key;

public WizardParameter (Type type, WizardParameter Method method, bool
required, string key)

{

this.Type = type;

this.Method = method;

this.IsRequired = required;

this.Key = key;

}

}

[~~~ .NET Ed ~~~]

Well I guess I will worry about the collection serialization when the time
comes. For now my problem is that this simple structure with four public
members (of which three should be serialized as attribute and the other as
inner text) and no indexers throws an InvalidOperatio nException with "There
was an error reflecting type WizardParameter " message.

Any ideas? I don't see why such a simple structure would not serialize. This
structure in particular should serialize as given below (a single element
with 3 attributes and inner text).

Emil

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Ed,

What are the details of the exception? I believe that you can't do
this properly because the XmlSerializer will only access public
properties, and can not access indexers either (which is how you would get
the items in the collection).

You might want to use the SoapFormatter (depending on how readable you
want the content to be).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"~~~ .NET Ed ~~~" <ti*********@ab olishspam.now> wrote in message
news:eO******** ******@TK2MSFTN GP15.phx.gbl...

Hello,

I am having a problem trying to serialize this simple structure, I use
it in a collection class that derives from CollectionBase but I noticed
that at least for now the serialization exception ocurrs when i try to
serialize this structure (see below). The idea is that it would be
serialized to:

< Param type="..." method="Get"
required="true" >something</Param>

I use the following to serialize:

WizarParameter wpar = new WizardParameter (typeof(int),
WizardParameter Method.Get, true, "something" );
StringWriter sw = new StringWriter();
XmlSerializer ser = new XmlSerializer(t ypeof(WizardPar ameter));
ser.Serialize(s w, wpar);

[Serializable]
[XmlRoot("Param" )]
public struct WizardParameter

{

/// The system type contained by this parameter
[XmlAttribute("t ype")]
public System.Type Type;

/// The method that should be used to pass this paramete
[XmlAttribute("m ethod")]
public WizardParameter Method Method; /// enumeration

/// Whether the parameter is required or optional

[XmlAttribute("r equired")]
public bool IsRequired;

[XmlElement("key ")]
public string Key;

public WizardParameter (Type type, WizardParameter Method method, bool
required, string key)

{

this.Type = type;

this.Method = method;

this.IsRequired = required;

this.Key = key;

}

}

[~~~ .NET Ed ~~~]

I finally found out, the message given was not enough, but exploring the
actual exception object generated told me the culprit was the Type property.
For some reason it is not able to serialize a member of type System.Type.
Since I don't have more time to spend on it I worked around it by converting
the member to a string and simply using x.GetType().ToS tring() now both the
structure (items) and the custom collection (based on CollectionBase)
serialize properly and with the element/attribute names I chose.

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Ed,

What are the details of the exception? I believe that you can't do
this properly because the XmlSerializer will only access public
properties, and can not access indexers either (which is how you would get
the items in the collection).

You might want to use the SoapFormatter (depending on how readable you
want the content to be).

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"~~~ .NET Ed ~~~" <ti*********@ab olishspam.now> wrote in message
news:eO******** ******@TK2MSFTN GP15.phx.gbl...

Hello,

I am having a problem trying to serialize this simple structure, I use
it in a collection class that derives from CollectionBase but I noticed
that at least for now the serialization exception ocurrs when i try to
serialize this structure (see below). The idea is that it would be
serialized to:

< Param type="..." method="Get"
required="true" >something</Param>

I use the following to serialize:

WizarParameter wpar = new WizardParameter (typeof(int),
WizardParameter Method.Get, true, "something" );
StringWriter sw = new StringWriter();
XmlSerializer ser = new XmlSerializer(t ypeof(WizardPar ameter));
ser.Serialize(s w, wpar);

[Serializable]
[XmlRoot("Param" )]
public struct WizardParameter

{

/// The system type contained by this parameter
[XmlAttribute("t ype")]
public System.Type Type;

/// The method that should be used to pass this paramete
[XmlAttribute("m ethod")]
public WizardParameter Method Method; /// enumeration

/// Whether the parameter is required or optional

[XmlAttribute("r equired")]
public bool IsRequired;

[XmlElement("key ")]
public string Key;

public WizardParameter (Type type, WizardParameter Method method, bool
required, string key)

{

this.Type = type;

this.Method = method;

this.IsRequired = required;

this.Key = key;

}

}