I reproduced your error message and found it is indeed a bug in the XML serializer from Microsoft.
When using the XmlSerializer(type) constructor, .NET automatically generates an assembly called AssemblyName.XmlSerializer.dll. This assembly contains the actual classes that do the serialization and deserialization of your code.
When running this in an empty console application, I first got a NullReferenceException like a few others commenting. When I was experimenting with self-generating the assembly using sgen, I did get reasonable code when using a class deriving from List> (you can only pre-compile classes, so you can't pre-compile a serializer for List[]).
I finally got your error message when using this class, which is possibly one of your test classes in your project:
public class X
{
public List[] Boxes { get; set; }
}
Using sgen:
"C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\sgen" /t:"expirement.X" /a:ConsoleApplication8.exe /force
This gives me the same error as you. Unfortunately, there is no quick fix. Using another type seems to do the trick. Report this issue at Microsoft Connect.
As a reference, this is the full code of the serialization (using switch /k in sgen). The code seems so broken, I couldn't quick fix it:
#if _DYNAMIC_XMLSERIALIZER_COMPILATION
[assembly:System.Security.AllowPartiallyTrustedCallers()]
[assembly:System.Security.SecurityTransparent()]
[assembly:System.Security.SecurityRules(System.Security.SecurityRuleSet.Level1)]
#endif
[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
[assembly: System.Xml.Serialization.XmlSerializerVersionAttribute(ParentAssemblyId = @"c80da358-347f-48cf-88a7-0fda1a15c25b,", Version = @"4.0.0.0")]
namespace Microsoft.Xml.Serialization.GeneratedAssembly
{
public class XmlSerializationWriterX : System.Xml.Serialization.XmlSerializationWriter
{
public void Write4_X(object o)
{
WriteStartDocument();
if (o == null)
{
WriteNullTagLiteral(@"X", @"");
return;
}
TopLevelElement();
Write3_X(@"X", @"", ((global::expirement.X)o), true, false);
}
void Write3_X(string n, string ns, global::expirement.X o, bool isNullable, bool needType)
{
if ((object)o == null)
{
if (isNullable) WriteNullTagLiteral(n, ns);
return;
}
if (!needType)
{
System.Type t = o.GetType();
if (t == typeof(global::expirement.X))
{
}
else
{
throw CreateUnknownTypeException(o);
}
}
WriteStartElement(n, ns, o, false, null);
if (needType) WriteXsiType(@"X", @"");
{
global::System.Collections.Generic.List[] a = (global::System.Collections.Generic.List[])((global::System.Collections.Generic.List[])o.@Boxes);
if (a != null)
{
WriteStartElement(@"Boxes", @"", null, false);
for (int ia = 0; ia < a.Length; ia++)
{
{
global::System.Collections.Generic.List aa = (global::System.Collections.Generic.List)((global::System.Collections.Generic.List)a[ia]);
if ((object)(aa) == null)
{
WriteNullTagLiteral(@"ArrayOfBox", @"");
}
else
{
WriteStartElement(@"ArrayOfBox", @"", null, false);
for (int iaa = 0; iaa < ((System.Collections.ICollection)aa).Count; iaa++)
{
Write2_Box(@"Box", @"", ((global::expirement.Box)aa[iaa]), true, false);
}
WriteEndElement();
}
}
}
WriteEndElement();
}
}
WriteEndElement(o);
}
void Write2_Box(string n, string ns, global::expirement.Box o, bool isNullable, bool needType)
{
if ((object)o == null)
{
if (isNullable) WriteNullTagLiteral(n, ns);
return;
}
if (!needType)
{
System.Type t = o.GetType();
if (t == typeof(global::expirement.Box))
{
}
else
{
throw CreateUnknownTypeException(o);
}
}
WriteStartElement(n, ns, o, false, null);
if (needType) WriteXsiType(@"Box", @"");
WriteElementStringRaw(@"x", @"", System.Xml.XmlConvert.ToString((global::System.Int32)((global::System.Int32)o.@x)));
WriteEndElement(o);
}
protected override void InitCallbacks()
{
}
}
public class XmlSerializationReaderX : System.Xml.Serialization.XmlSerializationReader
{
public object Read4_X()
{
object o = null;
Reader.MoveToContent();
if (Reader.NodeType == System.Xml.XmlNodeType.Element)
{
if (((object)Reader.LocalName == (object)id1_X && (object)Reader.NamespaceURI == (object)id2_Item))
{
o = Read3_X(true, true);
}
else
{
throw CreateUnknownNodeException();
}
}
else
{
UnknownNode(null, @":X");
}
return (object)o;
}
global::expirement.X Read3_X(bool isNullable, bool checkType) {
System.Xml.XmlQualifiedName xsiType = checkType ? GetXsiType() : null;
bool isNull = false;
if (isNullable) isNull = ReadNull();
if (checkType) {
if (xsiType == null || ((object) ((System.Xml.XmlQualifiedName)xsiType).Name == (object)id1_X && (object) ((System.Xml.XmlQualifiedName)xsiType).Namespace == (object)id2_Item)) {
}
else
throw CreateUnknownTypeException((System.Xml.XmlQualifiedName)xsiType);
}
if (isNull) return null;
global::expirement.X o;
o = new global::expirement.X();
global::System.Collections.Generic.List[] a_0 = null;
int ca_0 = 0;
bool[] paramsRead = new bool[1];
while (Reader.MoveToNextAttribute()) {
if (!IsXmlnsAttribute(Reader.Name)) {
UnknownNode((object)o);
}
}
Reader.MoveToElement();
if (Reader.IsEmptyElement) {
Reader.Skip();
return o;
}
Reader.ReadStartElement();
Reader.MoveToContent();
int whileIterations0 = 0;
int readerCount0 = ReaderCount;
while (Reader.NodeType != System.Xml.XmlNodeType.EndElement && Reader.NodeType != System.Xml.XmlNodeType.None) {
if (Reader.NodeType == System.Xml.XmlNodeType.Element) {
if (((object) Reader.LocalName == (object)id3_Boxes && (object) Reader.NamespaceURI == (object)id2_Item)) {
if (!ReadNull()) {
global::System.Collections.Generic.List[] a_0_0 = null;
int ca_0_0 = 0;
if ((Reader.IsEmptyElement)) {
Reader.Skip();
}
else {
Reader.ReadStartElement();
Reader.MoveToContent();
int whileIterations1 = 0;
int readerCount1 = ReaderCount;
while (Reader.NodeType != System.Xml.XmlNodeType.EndElement && Reader.NodeType != System.Xml.XmlNodeType.None) {
if (Reader.NodeType == System.Xml.XmlNodeType.Element) {
if (((object) Reader.LocalName == (object)id4_ArrayOfBox && (object) Reader.NamespaceURI == (object)id2_Item)) {
if (!ReadNull()) {
if ((object)(a_0_0 = (global::System.Collections.Generic.List[])EnsureArrayIndex(a_0_0, ca_0_0, typeof(global::System.Collections.Generic.List));a_0_0[ca_0_0++]) == null) a_0_0 = (global::System.Collections.Generic.List[])EnsureArrayIndex(a_0_0, ca_0_0, typeof(global::System.Collections.Generic.List));a_0_0[ca_0_0++] = new global::System.Collections.Generic.List();
global::System.Collections.Generic.List a_0_0_0 = (global::System.Collections.Generic.List)a_0_0 = (global::System.Collections.Generic.List[])EnsureArrayIndex(a_0_0, ca_0_0, typeof(global::System.Collections.Generic.List));a_0_0[ca_0_0++];
if ((Reader.IsEmptyElement)) {
Reader.Skip();
}
else {
Reader.ReadStartElement();
Reader.MoveToContent();
int whileIterations2 = 0;
int readerCount2 = ReaderCount;
while (Reader.NodeType != System.Xml.XmlNodeType.EndElement && Reader.NodeType != System.Xml.XmlNodeType.None) {
if (Reader.NodeType == System.Xml.XmlNodeType.Element) {
if (((object) Reader.LocalName == (object)id5_Box && (object) Reader.NamespaceURI == (object)id2_Item)) {
if ((object)(a_0_0_0) == null) Reader.Skip(); else a_0_0_0.Add(Read2_Box(true, true));
}
else {
UnknownNode(null, @":Box");
}
}
else {
UnknownNode(null, @":Box");
}
Reader.MoveToContent();
CheckReaderCount(ref whileIterations2, ref readerCount2);
}
ReadEndElement();
}
}
else {
if ((object)(a_0_0 = (global::System.Collections.Generic.List[])EnsureArrayIndex(a_0_0, ca_0_0, typeof(global::System.Collections.Generic.List));a_0_0[ca_0_0++]) == null) a_0_0 = (global::System.Collections.Generic.List[])EnsureArrayIndex(a_0_0, ca_0_0, typeof(global::System.Collections.Generic.List));a_0_0[ca_0_0++] = new global::System.Collections.Generic.List();
global::System.Collections.Generic.List a_0_0_0 = (global::System.Collections.Generic.List)a_0_0 = (global::System.Collections.Generic.List[])EnsureArrayIndex(a_0_0, ca_0_0, typeof(global::System.Collections.Generic.List));a_0_0[ca_0_0++];
}
}
else {
UnknownNode(null, @":ArrayOfBox");
}
}
else {
UnknownNode(null, @":ArrayOfBox");
}
Reader.MoveToContent();
CheckReaderCount(ref whileIterations1, ref readerCount1);
}
ReadEndElement();
}
o.@Boxes = (global::System.Collections.Generic.List[])ShrinkArray(a_0_0, ca_0_0, typeof(global::System.Collections.Generic.List), false);
}
}
else {
UnknownNode((object)o, @":Boxes");
}
}
else {
UnknownNode((object)o, @":Boxes");
}
Reader.MoveToContent();
CheckReaderCount(ref whileIterations0, ref readerCount0);
}
ReadEndElement();
return o;
}
global::expirement.Box Read2_Box(bool isNullable, bool checkType)
{
System.Xml.XmlQualifiedName xsiType = checkType ? GetXsiType() : null;
bool isNull = false;
if (isNullable) isNull = ReadNull();
if (checkType)
{
if (xsiType == null || ((object)((System.Xml.XmlQualifiedName)xsiType).Name == (object)id5_Box && (object)((System.Xml.XmlQualifiedName)xsiType).Namespace == (object)id2_Item))
{
}
else
throw CreateUnknownTypeException((System.Xml.XmlQualifiedName)xsiType);
}
if (isNull) return null;
global::expirement.Box o;
o = new global::expirement.Box();
bool[] paramsRead = new bool[1];
while (Reader.MoveToNextAttribute())
{
if (!IsXmlnsAttribute(Reader.Name))
{
UnknownNode((object)o);
}
}
Reader.MoveToElement();
if (Reader.IsEmptyElement)
{
Reader.Skip();
return o;
}
Reader.ReadStartElement();
Reader.MoveToContent();
int whileIterations3 = 0;
int readerCount3 = ReaderCount;
while (Reader.NodeType != System.Xml.XmlNodeType.EndElement && Reader.NodeType != System.Xml.XmlNodeType.None)
{
if (Reader.NodeType == System.Xml.XmlNodeType.Element)
{
if (!paramsRead[0] && ((object)Reader.LocalName == (object)id6_x && (object)Reader.NamespaceURI == (object)id2_Item))
{
{
o.@x = System.Xml.XmlConvert.ToInt32(Reader.ReadElementString());
}
paramsRead[0] = true;
}
else
{
UnknownNode((object)o, @":x");
}
}
else
{
UnknownNode((object)o, @":x");
}
Reader.MoveToContent();
CheckReaderCount(ref whileIterations3, ref readerCount3);
}
ReadEndElement();
return o;
}
protected override void InitCallbacks()
{
}
string id5_Box;
string id3_Boxes;
string id1_X;
string id2_Item;
string id6_x;
string id4_ArrayOfBox;
protected override void InitIDs()
{
id5_Box = Reader.NameTable.Add(@"Box");
id3_Boxes = Reader.NameTable.Add(@"Boxes");
id1_X = Reader.NameTable.Add(@"X");
id2_Item = Reader.NameTable.Add(@"");
id6_x = Reader.NameTable.Add(@"x");
id4_ArrayOfBox = Reader.NameTable.Add(@"ArrayOfBox");
}
}
public abstract class XmlSerializer1 : System.Xml.Serialization.XmlSerializer
{
protected override System.Xml.Serialization.XmlSerializationReader CreateReader()
{
return new XmlSerializationReaderX();
}
protected override System.Xml.Serialization.XmlSerializationWriter CreateWriter()
{
return new XmlSerializationWriterX();
}
}
public sealed class XSerializer : XmlSerializer1
{
public override System.Boolean CanDeserialize(System.Xml.XmlReader xmlReader)
{
return xmlReader.IsStartElement(@"X", @"");
}
protected override void Serialize(object objectToSerialize, System.Xml.Serialization.XmlSerializationWriter writer)
{
((XmlSerializationWriterX)writer).Write4_X(objectToSerialize);
}
protected override object Deserialize(System.Xml.Serialization.XmlSerializationReader reader)
{
return ((XmlSerializationReaderX)reader).Read4_X();
}
}
public class XmlSerializerContract : global::System.Xml.Serialization.XmlSerializerImplementation
{
public override global::System.Xml.Serialization.XmlSerializationReader Reader { get { return new XmlSerializationReaderX(); } }
public override global::System.Xml.Serialization.XmlSerializationWriter Writer { get { return new XmlSerializationWriterX(); } }
System.Collections.Hashtable readMethods = null;
public override System.Collections.Hashtable ReadMethods
{
get
{
if (readMethods == null)
{
System.Collections.Hashtable _tmp = new System.Collections.Hashtable();
_tmp[@"expirement.X::"] = @"Read4_X";
if (readMethods == null) readMethods = _tmp;
}
return readMethods;
}
}
System.Collections.Hashtable writeMethods = null;
public override System.Collections.Hashtable WriteMethods
{
get
{
if (writeMethods == null)
{
System.Collections.Hashtable _tmp = new System.Collections.Hashtable();
_tmp[@"expirement.X::"] = @"Write4_X";
if (writeMethods == null) writeMethods = _tmp;
}
return writeMethods;
}
}
System.Collections.Hashtable typedSerializers = null;
public override System.Collections.Hashtable TypedSerializers
{
get
{
if (typedSerializers == null)
{
System.Collections.Hashtable _tmp = new System.Collections.Hashtable();
_tmp.Add(@"expirement.X::", new XSerializer());
if (typedSerializers == null) typedSerializers = _tmp;
}
return typedSerializers;
}
}
public override System.Boolean CanSerialize(System.Type type)
{
if (type == typeof(global::expirement.X)) return true;
return false;
}
public override System.Xml.Serialization.XmlSerializer GetSerializer(System.Type type)
{
if (type == typeof(global::expirement.X)) return new XSerializer();
return null;
}
}
}
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