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dotnet xml : HOWTO Overcome missing namespace declaration in root node
namespace declaration. My Type has an XmlTypeAttribute with a namespace defined. If I attempt to deserialize the XML, I get the dreaded <elementname xmlns=''> was not expected exception. If I comment out the XmlTypeAttribute, it works just fine. Just so you know, when I instantiate an instance of an XmlSerializer, I pass a default namespace to the ctor. Unfortunately that doesn't seem to work. So, how can I get the XmlSerializer to accept XML that is missing namespace declarations? -- -- David B. Bitton david@codenoevil.com www.codenoevil.com Code Made Fresh DailyT
David,
Can you post: * The serialization class * the tag of the root element, including all namespace definitions * the line of code where you instantiate the XmlSerializer -- Christoph Schittko [MVP] Software Architect, .NET Mentor [quoted text, click to view] "David B. Bitton" <david@codenoevil.com> wrote in message news:%23Je9uj6JEHA.2244@tk2msftngp13.phx.gbl... > I am having a problem deserializing XML when the root node is missing a > namespace declaration. My Type has an XmlTypeAttribute with a namespace > defined. If I attempt to deserialize the XML, I get the dreaded > > <elementname xmlns=''> was not expected > > exception. If I comment out the XmlTypeAttribute, it works just fine. Just > so you know, when I instantiate an instance of an XmlSerializer, I pass a > default namespace to the ctor. Unfortunately that doesn't seem to work. > > So, how can I get the XmlSerializer to accept XML that is missing namespace > declarations? > > -- > -- > > David B. Bitton > david@codenoevil.com > www.codenoevil.com > > Code Made Fresh DailyT > >
Chris,
Look inline below: -- -- David B. Bitton david@codenoevil.com www.codenoevil.com Code Made Fresh Daily™ "Christoph Schittko [MVP]" <christophdotnetINVALID@austin.rr.com> wrote in message news:eN4XNSCKEHA.952@TK2MSFTNGP12.phx.gbl... [quoted text, click to view] > David, > > Can you post: > > * The serialization class [System.Xml.Serialization.XmlTypeAttribute(Namespace=TransferManifest.DEFAUL T_NAMESPACE)] [System.Xml.Serialization.XmlRootAttribute(Namespace=TransferManifest.DEFAUL T_NAMESPACE, IsNullable=false, ElementName="transfermanifest")] public class TransferManifest { public const string DEFAULT_NAMESPACE = "http://codenoevil.com/TransferManifest.xsd"; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("filelist")] public FileList[] FileLists; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("folderlist")] public FolderList[] FolderLists; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("uploadinfo")] public UploadInfo[] UploadInfos; #region XML (de)serialization code public static TransferManifest ReadXml(string xml) { XmlSerializer xmlSerializer = new XmlSerializer(typeof(TransferManifest)); xmlSerializer.UnknownNode+= new XmlNodeEventHandler(XmlSerializer_UnknownNode); xmlSerializer.UnknownAttribute+= new XmlAttributeEventHandler(XmlSerializer_UnknownAttribute); try { TransferManifest transferManifest = (TransferManifest)xmlSerializer.Deserialize( new StringReader(xml) ); return transferManifest; } catch(Exception ex) { throw new ApplicationException("TransferManifest failed to deserialize: " + ex.Message, ex); } } public static string WriteXml(TransferManifest transferManifest) { XmlSerializer xmlSerializer = new XmlSerializer(typeof(TransferManifest), DEFAULT_NAMESPACE); StringWriter stringWriter = new StringWriter(); xmlSerializer.Serialize(stringWriter, transferManifest); return stringWriter.ToString(); } private static void XmlSerializer_UnknownNode (object sender, XmlNodeEventArgs e) { Debug.WriteLine("Unknown Node:" + e.Name + "\t" + e.Text); } private static void XmlSerializer_UnknownAttribute (object sender, XmlAttributeEventArgs e) { System.Xml.XmlAttribute attr = e.Attr; Debug.WriteLine("Unknown attribute " + attr.Name + "='" + attr.Value + "'"); } #endregion } [quoted text, click to view] > * the tag of the root element, including all namespace definitions <transfermanifest> [quoted text, click to view] > * the line of code where you instantiate the XmlSerializer Look inside the WriteXml() method above. [quoted text, click to view] > > -- > Christoph Schittko [MVP] > Software Architect, .NET Mentor > > "David B. Bitton" <david@codenoevil.com> wrote in message > news:%23Je9uj6JEHA.2244@tk2msftngp13.phx.gbl... > > I am having a problem deserializing XML when the root node is missing a > > namespace declaration. My Type has an XmlTypeAttribute with a namespace > > defined. If I attempt to deserialize the XML, I get the dreaded > > > > <elementname xmlns=''> was not expected > > > > exception. If I comment out the XmlTypeAttribute, it works just fine. > Just > > so you know, when I instantiate an instance of an XmlSerializer, I pass a > > default namespace to the ctor. Unfortunately that doesn't seem to work. > > > > So, how can I get the XmlSerializer to accept XML that is missing > namespace > > declarations? > > > > -- > > -- > > > > David B. Bitton > > david@codenoevil.com > > www.codenoevil.com > > > > Code Made Fresh DailyT > > > > > >
David,
The code you posted works fine for me with this code: TransferManifest mfst = new TransferManifest(); string xml = TransferManifest.WriteXml( mfst ); mfst = TransferManifest.ReadXml( xml ); but I removed the three array type properties /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("filelist")] public FileList[] FileLists; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("folderlist")] public FolderList[] FolderLists; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute("uploadinfo")] public UploadInfo[] UploadInfos; because I didn't have the class definitions. The root element <transfermanifest> you posted would not deserialize because it's missing the XML namespace that you declared with the XmlRoot and XmlType attributes. The root element needs a namespace declaration like this: <transfermanifest xmlns=http://codenoevil.com/TransferManifest.xsd> which your code produces. You could either post more code, or follow the instructions at [0] on how to debug deserialization. -- HTH Christoph Schittko [MVP] Software Architect, .NET Mentor [quoted text, click to view] "David B. Bitton" <david@codenoevil.com> wrote in message news:%23q6PRPHKEHA.2680@TK2MSFTNGP11.phx.gbl... > Chris, > Look inline below: > > -- > -- > > David B. Bitton > david@codenoevil.com > www.codenoevil.com > > Code Made Fresh DailyT > "Christoph Schittko [MVP]" <christophdotnetINVALID@austin.rr.com> wrote in > message news:eN4XNSCKEHA.952@TK2MSFTNGP12.phx.gbl... > > David, > > > > Can you post: > > > > * The serialization class > > [System.Xml.Serialization.XmlTypeAttribute(Namespace=TransferManifest.DEFAUL > T_NAMESPACE)] > [System.Xml.Serialization.XmlRootAttribute(Namespace=TransferManifest.DEFAUL > T_NAMESPACE, IsNullable=false, ElementName="transfermanifest")] > public class TransferManifest { > > public const string DEFAULT_NAMESPACE = > "http://codenoevil.com/TransferManifest.xsd"; > > /// <remarks/> > [System.Xml.Serialization.XmlElementAttribute("filelist")] > public FileList[] FileLists; > > /// <remarks/> > [System.Xml.Serialization.XmlElementAttribute("folderlist")] > public FolderList[] FolderLists; > > /// <remarks/> > [System.Xml.Serialization.XmlElementAttribute("uploadinfo")] > public UploadInfo[] UploadInfos; > > #region XML (de)serialization code > public static TransferManifest ReadXml(string xml) > { > XmlSerializer xmlSerializer = > new XmlSerializer(typeof(TransferManifest)); > > xmlSerializer.UnknownNode+= new > XmlNodeEventHandler(XmlSerializer_UnknownNode); > xmlSerializer.UnknownAttribute+= new > XmlAttributeEventHandler(XmlSerializer_UnknownAttribute); > > try > { > TransferManifest transferManifest = > (TransferManifest)xmlSerializer.Deserialize( > new StringReader(xml) > ); > > return transferManifest; > } > catch(Exception ex) > { > throw new ApplicationException("TransferManifest failed to deserialize: " > + ex.Message, ex); > } > } > > public static string WriteXml(TransferManifest transferManifest) > { > XmlSerializer xmlSerializer = > new XmlSerializer(typeof(TransferManifest), DEFAULT_NAMESPACE); > > StringWriter stringWriter = new StringWriter(); > > xmlSerializer.Serialize(stringWriter, transferManifest); > > return stringWriter.ToString(); > } > > private static void XmlSerializer_UnknownNode > (object sender, XmlNodeEventArgs e) > { > Debug.WriteLine("Unknown Node:" + e.Name + "\t" + e.Text); > } > > private static void XmlSerializer_UnknownAttribute > (object sender, XmlAttributeEventArgs e) > { > System.Xml.XmlAttribute attr = e.Attr; > Debug.WriteLine("Unknown attribute " + > attr.Name + "='" + attr.Value + "'"); > } > #endregion > } > > > > * the tag of the root element, including all namespace definitions > > <transfermanifest> > > > * the line of code where you instantiate the XmlSerializer > > Look inside the WriteXml() method above. > > > > > -- > > Christoph Schittko [MVP] > > Software Architect, .NET Mentor > > > > "David B. Bitton" <david@codenoevil.com> wrote in message > > news:%23Je9uj6JEHA.2244@tk2msftngp13.phx.gbl... > > > I am having a problem deserializing XML when the root node is missing a > > > namespace declaration. My Type has an XmlTypeAttribute with a namespace > > > defined. If I attempt to deserialize the XML, I get the dreaded > > > > > > <elementname xmlns=''> was not expected > > > > > > exception. If I comment out the XmlTypeAttribute, it works just fine. > > Just > > > so you know, when I instantiate an instance of an XmlSerializer, I pass > a > > > default namespace to the ctor. Unfortunately that doesn't seem to work. > > > > > > So, how can I get the XmlSerializer to accept XML that is missing > > namespace > > > declarations? > > > > > > -- > > > -- > > > > > > David B. Bitton > > > david@codenoevil.com > > > www.codenoevil.com > > > > > > Code Made Fresh DailyT > > > > > > > > > > > >
Chris,
I am well aware of _why_ the exception occurs. Now I need a way to work around it. How can I provide a "hint" to the XmlSerializer that if the root node has either an empty xmlns, or none at all, that the root node namespace _should_ be something, and it's OK if the node is missing the declaration. -- -- David B. Bitton david@codenoevil.com www.codenoevil.com Code Made Fresh Daily™ "Christoph Schittko [MVP]" <christophdotnetINVALID@austin.rr.com> wrote in message news:%23qyfVfNKEHA.3216@tk2msftngp13.phx.gbl... [quoted text, click to view] > David, > > The code you posted works fine for me with this code: > > TransferManifest mfst = new TransferManifest(); > string xml = TransferManifest.WriteXml( mfst ); > mfst = TransferManifest.ReadXml( xml ); > > but I removed the three array type properties > > /// <remarks/> > [System.Xml.Serialization.XmlElementAttribute("filelist")] > public FileList[] FileLists; > > /// <remarks/> > [System.Xml.Serialization.XmlElementAttribute("folderlist")] > public FolderList[] FolderLists; > > /// <remarks/> > [System.Xml.Serialization.XmlElementAttribute("uploadinfo")] > public UploadInfo[] UploadInfos; > > because I didn't have the class definitions. > > The root element > > <transfermanifest> > > you posted would not deserialize because it's missing the XML namespace that > you declared with the XmlRoot and XmlType attributes. The root element needs > a namespace declaration like this: > > <transfermanifest xmlns=http://codenoevil.com/TransferManifest.xsd> > > which your code produces. > > You could either post more code, or follow the instructions at [0] on how to > debug deserialization. > > -- > HTH > Christoph Schittko [MVP] > Software Architect, .NET Mentor > > "David B. Bitton" <david@codenoevil.com> wrote in message > news:%23q6PRPHKEHA.2680@TK2MSFTNGP11.phx.gbl... > > Chris, > > Look inline below: > > > > -- > > -- > > > > David B. Bitton > > david@codenoevil.com > > www.codenoevil.com > > > > Code Made Fresh DailyT > > "Christoph Schittko [MVP]" <christophdotnetINVALID@austin.rr.com> wrote in > > message news:eN4XNSCKEHA.952@TK2MSFTNGP12.phx.gbl... > > > David, > > > > > > Can you post: > > > > > > * The serialization class > > > > > [System.Xml.Serialization.XmlTypeAttribute(Namespace=TransferManifest.DEFAUL > > T_NAMESPACE)] > > > [System.Xml.Serialization.XmlRootAttribute(Namespace=TransferManifest.DEFAUL > > T_NAMESPACE, IsNullable=false, ElementName="transfermanifest")] > > public class TransferManifest { > > > > public const string DEFAULT_NAMESPACE = > > "http://codenoevil.com/TransferManifest.xsd"; > > > > /// <remarks/> > > [System.Xml.Serialization.XmlElementAttribute("filelist")] > > public FileList[] FileLists; > > > > /// <remarks/> > > [System.Xml.Serialization.XmlElementAttribute("folderlist")] > > public FolderList[] FolderLists; > > > > /// <remarks/> > > [System.Xml.Serialization.XmlElementAttribute("uploadinfo")] > > public UploadInfo[] UploadInfos; > > > > #region XML (de)serialization code > > public static TransferManifest ReadXml(string xml) > > { > > XmlSerializer xmlSerializer = > > new XmlSerializer(typeof(TransferManifest)); > > > > xmlSerializer.UnknownNode+= new > > XmlNodeEventHandler(XmlSerializer_UnknownNode); > > xmlSerializer.UnknownAttribute+= new > > XmlAttributeEventHandler(XmlSerializer_UnknownAttribute); > > > > try > > { > > TransferManifest transferManifest = > > (TransferManifest)xmlSerializer.Deserialize( > > new StringReader(xml) > > ); > > > > return transferManifest; > > } > > catch(Exception ex) > > { > > throw new ApplicationException("TransferManifest failed to deserialize: > " > > + ex.Message, ex); > > } > > } > > > > public static string WriteXml(TransferManifest transferManifest) > > { > > XmlSerializer xmlSerializer = > > new XmlSerializer(typeof(TransferManifest), DEFAULT_NAMESPACE); > > > > StringWriter stringWriter = new StringWriter(); > > > > xmlSerializer.Serialize(stringWriter, transferManifest); > > > > return stringWriter.ToString(); > > } > > > > private static void XmlSerializer_UnknownNode > > (object sender, XmlNodeEventArgs e) > > { > > Debug.WriteLine("Unknown Node:" + e.Name + "\t" + e.Text); > > } > > > > private static void XmlSerializer_UnknownAttribute > > (object sender, XmlAttributeEventArgs e) > > { > > System.Xml.XmlAttribute attr = e.Attr; > > Debug.WriteLine("Unknown attribute " + > > attr.Name + "='" + attr.Value + "'"); > > } > > #endregion > > } > > > > > > > * the tag of the root element, including all namespace definitions > > > > <transfermanifest> > > > > > * the line of code where you instantiate the XmlSerializer > > > > Look inside the WriteXml() method above. > > > > > > > > -- > > > Christoph Schittko [MVP] > > > Software Architect, .NET Mentor > > > > > > "David B. Bitton" <david@codenoevil.com> wrote in message > > > news:%23Je9uj6JEHA.2244@tk2msftngp13.phx.gbl... > > > > I am having a problem deserializing XML when the root node is missing > a > > > > namespace declaration. My Type has an XmlTypeAttribute with a > namespace > > > > defined. If I attempt to deserialize the XML, I get the dreaded > > > > > > > > <elementname xmlns=''> was not expected > > > > > > > > exception. If I comment out the XmlTypeAttribute, it works just fine. > > > Just > > > > so you know, when I instantiate an instance of an XmlSerializer, I > pass > > a > > > > default namespace to the ctor. Unfortunately that doesn't seem to > work. > > > > > > > > So, how can I get the XmlSerializer to accept XML that is missing > > > namespace > > > > declarations? > > > > > > > > -- > > > > -- > > > > > > > > David B. Bitton > > > > david@codenoevil.com > > > > www.codenoevil.com > > > > > > > > Code Made Fresh DailyT > > > > > > > > > > > > > > > > > > > >
David,
Now I am with you ... and tha bad news is that the XmlSerializer is not really intended to do what you're trying to do. From an XML perspective, you're trying to deserialize two entirely different XML formats. While the two formats share the same element names, their QNames (name+namespace) are different. An XmlSerializer is really only good at processing one format. You may be able to work around this with two serializer instances. One that you instantiate with XmlSerializer ser1 = new XmlSerializer( typeof( TransferManifest ) ); and another one that you instantiate with XmlOverrideAttributes supplied to the constructor: <notTested> XmlAttributeOverrides overrides = new XmlAttributeOverrides(); XmlAttributes atts = new XmlAttributes(); // override the XmlType and XmlRoot attributes atts.XmlType = new XmlTypeAttribute(); atts.XmlRoot = new XmlRootAttribute(); overrides.Add( typeof( TransferManifest ), atts ); XmlSerializer ser2 = new XmlSerializer( typeof( TransferManifest ), overrides ); </notTested> then you read the first element of your XML document with an XmlTextReader to determine if any namespaces are declared. TransferManifest tm = null; XmlTextReader reader = new XmlTextReader( new StringReader( xml ) ); if( reader.Read() ) { if( reader.NamespaceURI = "" ) { reader.Close(); tm = ser2.Deserialize( new StringReader( xml ) ); } else { reader.Close(); tm = ser1.Deserialize( new StringReader( xml ) ); } } Let me know if this works ... -- Christoph Schittko [MVP, XmlInsider] Software Architect, .NET Mentor [quoted text, click to view] "David B. Bitton" <david@codenoevil.com> wrote in message
news:elbWPfUKEHA.2244@tk2msftngp13.phx.gbl... > Chris, > I am well aware of _why_ the exception occurs. Now I need a way to work > around it. How can I provide a "hint" to the XmlSerializer that if the root > node has either an empty xmlns, or none at all, that the root node namespace > _should_ be something, and it's OK if the node is missing the declaration. > > -- > -- > > David B. Bitton > david@codenoevil.com > www.codenoevil.com > > Code Made Fresh DailyT > "Christoph Schittko [MVP]" <christophdotnetINVALID@austin.rr.com> wrote in > message news:%23qyfVfNKEHA.3216@tk2msftngp13.phx.gbl... > > David, > > > > The code you posted works fine for me with this code: > > > > TransferManifest mfst = new TransferManifest(); > > string xml = TransferManifest.WriteXml( mfst ); > > mfst = TransferManifest.ReadXml( xml ); > > > > but I removed the three array type properties > > > > /// <remarks/> > > [System.Xml.Serialization.XmlElementAttribute("filelist")] > > public FileList[] FileLists; > > > > /// <remarks/> > > [System.Xml.Serialization.XmlElementAttribute("folderlist")] > > public FolderList[] FolderLists; > > > > /// <remarks/> > > [System.Xml.Serialization.XmlElementAttribute("uploadinfo")] > > public UploadInfo[] UploadInfos; > > > > because I didn't have the class definitions. > > > > The root element > > > > <transfermanifest> > > > > you posted would not deserialize because it's missing the XML namespace > that > > you declared with the XmlRoot and XmlType attributes. The root element > needs > > a namespace declaration like this: > > > > <transfermanifest xmlns=http://codenoevil.com/TransferManifest.xsd> > > > > which your code produces. > > > > You could either post more code, or follow the instructions at [0] on how > to > > debug deserialization. > > > > -- > > HTH > > Christoph Schittko [MVP] > > Software Architect, .NET Mentor > > > > "David B. Bitton" <david@codenoevil.com> wrote in message > > news:%23q6PRPHKEHA.2680@TK2MSFTNGP11.phx.gbl... > > > Chris, > > > Look inline below: > > > > > > -- > > > -- > > > > > > David B. Bitton > > > david@codenoevil.com > > > www.codenoevil.com > > > > > > Code Made Fresh DailyT > > > "Christoph Schittko [MVP]" <christophdotnetINVALID@austin.rr.com> wrote > in > > > message news:eN4XNSCKEHA.952@TK2MSFTNGP12.phx.gbl... > > > > David, > > > > > > > > Can you post: > > > > > > > > * The serialization class > > > > > > > > > [System.Xml.Serialization.XmlTypeAttribute(Namespace=TransferManifest.DEFAUL > > > T_NAMESPACE)] > > > > > > [System.Xml.Serialization.XmlRootAttribute(Namespace=TransferManifest.DEFAUL > > > T_NAMESPACE, IsNullable=false, ElementName="transfermanifest")] > > > public class TransferManifest { > > > > > > public const string DEFAULT_NAMESPACE = > > > "http://codenoevil.com/TransferManifest.xsd"; > > > > > > /// <remarks/> > > > [System.Xml.Serialization.XmlElementAttribute("filelist")] > > > public FileList[] FileLists; > > > > > > /// <remarks/> > > > [System.Xml.Serialization.XmlElementAttribute("folderlist")] > > > public FolderList[] FolderLists; > > > > > > /// <remarks/> > > > [System.Xml.Serialization.XmlElementAttribute("uploadinfo")] > > > public UploadInfo[] UploadInfos; > > > > > > #region XML (de)serialization code > > > public static TransferManifest ReadXml(string xml) > > > { > > > XmlSerializer xmlSerializer = > > > new XmlSerializer(typeof(TransferManifest)); > > > > > > xmlSerializer.UnknownNode+= new > > > XmlNodeEventHandler(XmlSerializer_UnknownNode); > > > xmlSerializer.UnknownAttribute+= new > > > XmlAttributeEventHandler(XmlSerializer_UnknownAttribute); > > > > > > try > > > { > > > TransferManifest transferManifest = > > > (TransferManifest)xmlSerializer.Deserialize( > > > new StringReader(xml) > > > ); > > > > > > return transferManifest; > > > } > > > catch(Exception ex) > > > { > > > throw new ApplicationException("TransferManifest failed to > deserialize: > > " > > > + ex.Message, ex); > > > } > > > } > > > > > > public static string WriteXml(TransferManifest transferManifest) > > > { > > > XmlSerializer xmlSerializer = > > > new XmlSerializer(typeof(TransferManifest), DEFAULT_NAMESPACE); > > > > > > StringWriter stringWriter = new StringWriter(); > > > > > > xmlSerializer.Serialize(stringWriter, transferManifest); > > > > > > return stringWriter.ToString(); > > > } > > > > > > private static void XmlSerializer_UnknownNode > > > (object sender, XmlNodeEventArgs e) > > > { > > > Debug.WriteLine("Unknown Node:" + e.Name + "\t" + e.Text); > > > } > > > > > > private static void XmlSerializer_UnknownAttribute > > > (object sender, XmlAttributeEventArgs e) > > > { > > > System.Xml.XmlAttribute attr = e.Attr; > > > Debug.WriteLine("Unknown attribute " + > > > attr.Name + "='" + attr.Value + "'"); > > > } > > > #endregion > > > } > > > > > > > > > > * the tag of the root element, including all namespace definitions > > > > > > <transfermanifest> > > >
Hi David,
I agree with Chris on this. Since you're serializing two Xml documents with different formats, I think you have to create two serializers to get them work. For workaround, Chris has provided us with a good example. If anything is unclear, please feel free to reply to the post. I'll try my best to help. Kevin Yu ======= "This posting is provided "AS IS" with no warranties, and confers no rights."
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