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HELP Problem serializing a structureI 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), WizardParameterMethod.Get, true, "something"); StringWriter sw = new StringWriter(); XmlSerializer ser = new XmlSerializer(typeof(WizardParameter)); ser.Serialize(sw, wpar); [Serializable] [XmlRoot("Param")] public struct WizardParameter { /// The system type contained by this parameter [XmlAttribute("type")] public System.Type Type; /// The method that should be used to pass this paramete [XmlAttribute("method")] public WizardParameterMethod Method; /// enumeration /// Whether the parameter is required or optional [XmlAttribute("required")] public bool IsRequired; [XmlElement("key")] public string Key; public WizardParameter(Type type, WizardParameterMethod method, bool required, string key) { this.Type = type; this.Method = method; this.IsRequired = required; this.Key = key; } } 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. -- Show quoteHide quote- Nicholas Paldino [.NET/C# MVP] - mvp@spam.guard.caspershouse.com "~~~ .NET Ed ~~~" <tiredofspam@abolishspam.now> wrote in message news:eO39QaUOFHA.3512@TK2MSFTNGP15.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), > WizardParameterMethod.Get, true, "something"); > StringWriter sw = new StringWriter(); > XmlSerializer ser = new XmlSerializer(typeof(WizardParameter)); > ser.Serialize(sw, wpar); > > [Serializable] > [XmlRoot("Param")] > public struct WizardParameter > > { > > /// The system type contained by this parameter > [XmlAttribute("type")] > public System.Type Type; > > /// The method that should be used to pass this paramete > [XmlAttribute("method")] > public WizardParameterMethod Method; /// enumeration > > /// Whether the parameter is required or optional > > [XmlAttribute("required")] > public bool IsRequired; > > [XmlElement("key")] > public string Key; > > public WizardParameter(Type type, WizardParameterMethod method, bool > required, string key) > > { > > this.Type = type; > > this.Method = method; > > this.IsRequired = required; > > this.Key = key; > > } > > } > > 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 InvalidOperationException 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 Show quoteHide quote "Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard.caspershouse.com> wrote in message news:%23qFzErUOFHA.1500@TK2MSFTNGP09.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] > - mvp@spam.guard.caspershouse.com > > "~~~ .NET Ed ~~~" <tiredofspam@abolishspam.now> wrote in message > news:eO39QaUOFHA.3512@TK2MSFTNGP15.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), >> WizardParameterMethod.Get, true, "something"); >> StringWriter sw = new StringWriter(); >> XmlSerializer ser = new XmlSerializer(typeof(WizardParameter)); >> ser.Serialize(sw, wpar); >> >> [Serializable] >> [XmlRoot("Param")] >> public struct WizardParameter >> >> { >> >> /// The system type contained by this parameter >> [XmlAttribute("type")] >> public System.Type Type; >> >> /// The method that should be used to pass this paramete >> [XmlAttribute("method")] >> public WizardParameterMethod Method; /// enumeration >> >> /// Whether the parameter is required or optional >> >> [XmlAttribute("required")] >> public bool IsRequired; >> >> [XmlElement("key")] >> public string Key; >> >> public WizardParameter(Type type, WizardParameterMethod method, bool >> required, string key) >> >> { >> >> this.Type = type; >> >> this.Method = method; >> >> this.IsRequired = required; >> >> this.Key = key; >> >> } >> >> } >> >> > > 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().ToString() now both the structure (items) and the custom collection (based on CollectionBase) serialize properly and with the element/attribute names I chose. Show quoteHide quote "Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard.caspershouse.com> wrote in message news:%23qFzErUOFHA.1500@TK2MSFTNGP09.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] > - mvp@spam.guard.caspershouse.com > > "~~~ .NET Ed ~~~" <tiredofspam@abolishspam.now> wrote in message > news:eO39QaUOFHA.3512@TK2MSFTNGP15.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), >> WizardParameterMethod.Get, true, "something"); >> StringWriter sw = new StringWriter(); >> XmlSerializer ser = new XmlSerializer(typeof(WizardParameter)); >> ser.Serialize(sw, wpar); >> >> [Serializable] >> [XmlRoot("Param")] >> public struct WizardParameter >> >> { >> >> /// The system type contained by this parameter >> [XmlAttribute("type")] >> public System.Type Type; >> >> /// The method that should be used to pass this paramete >> [XmlAttribute("method")] >> public WizardParameterMethod Method; /// enumeration >> >> /// Whether the parameter is required or optional >> >> [XmlAttribute("required")] >> public bool IsRequired; >> >> [XmlElement("key")] >> public string Key; >> >> public WizardParameter(Type type, WizardParameterMethod method, bool >> required, string key) >> >> { >> >> this.Type = type; >> >> this.Method = method; >> >> this.IsRequired = required; >> >> this.Key = key; >> >> } >> >> } >> >> > >  
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