C
C#•2y ago
Pillow

System.InvalidOperationException: ... cannot be serialized because it does not have a parameterles..

I'm trying to make an AOT class library, but I am unable to run it once compiled. Here's the bit of code it doesn't like 
var parser = new TMXParser();
parser.Export(tmx, tmxpath);
var parser = new TMXParser();
parser.Export(tmx, tmxpath);
and the full error: 
Unhandled Exception: System.InvalidOperationException: There was an error generating the XML document.
 ---> System.InvalidOperationException: TMXTile.TMXMap cannot be serialized because it does not have a parameterless constructor.
   at System.Xml.Serialization.TypeDesc.CheckSupported() + 0x44
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type, MemberInfo, Boolean, Boolean) + 0xa5
   at System.Xml.Serialization.ModelScope.GetTypeModel(Type, Boolean) + 0x5a
   at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type, XmlRootAttribute, String) + 0x50
   at System.Xml.Serialization.XmlSerializer.GetMapping() + 0x4f
   at System.Xml.Serialization.XmlSerializer.SerializeUsingReflection(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) + 0x1a
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) + 0x84
   --- End of inner exception stack trace ---
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) + 0x1a8
   at TMXTile.TMXParser.Export(TMXMap, Stream, DataEncodingType) + 0x97
   at TMXTile.TMXParser.Export(TMXMap, String, DataEncodingType) + 0x73
   at ToasterMap.ToasterMap.Init(IntPtr, IntPtr) + 0xef
Unhandled Exception: System.InvalidOperationException: There was an error generating the XML document.
 ---> System.InvalidOperationException: TMXTile.TMXMap cannot be serialized because it does not have a parameterless constructor.
   at System.Xml.Serialization.TypeDesc.CheckSupported() + 0x44
   at System.Xml.Serialization.TypeScope.GetTypeDesc(Type, MemberInfo, Boolean, Boolean) + 0xa5
   at System.Xml.Serialization.ModelScope.GetTypeModel(Type, Boolean) + 0x5a
   at System.Xml.Serialization.XmlReflectionImporter.ImportTypeMapping(Type, XmlRootAttribute, String) + 0x50
   at System.Xml.Serialization.XmlSerializer.GetMapping() + 0x4f
   at System.Xml.Serialization.XmlSerializer.SerializeUsingReflection(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) + 0x1a
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) + 0x84
   --- End of inner exception stack trace ---
   at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) + 0x1a8
   at TMXTile.TMXParser.Export(TMXMap, Stream, DataEncodingType) + 0x97
   at TMXTile.TMXParser.Export(TMXMap, String, DataEncodingType) + 0x73
   at ToasterMap.ToasterMap.Init(IntPtr, IntPtr) + 0xef
13 Replies
mtreit
mtreit•2y ago
The error is telling you exactly what the issue is. The type you are trying to serialize needs a parameterless constructor Because the serializer uses that to construct an empty instance and then set the properties / fields.
Pillow
PillowOP•2y ago
do I not have one right there tho?
mtreit
mtreit•2y ago
The type in the error is TMXMap not TMXParser
Pillow
PillowOP•2y ago
I don't think TMXMap has a constructor tho
mtreit
mtreit•2y ago
That's exactly why you're getting the error. It doesn't have one. But if you want to serialize it, it has to have one.
Pillow
PillowOP•2y ago
so I just can't use that library at all?
mtreit
mtreit•2y ago
I take it that it's not something you wrote yourself?
Pillow
PillowOP•2y ago
correct
mtreit
mtreit•2y ago
If you don't own the type and it doesn't provide a parameterless constructor, I don't think there is a good way for you to serialize it with XmlSerializer.
Pillow
PillowOP•2y ago
oh so I just.. can't do it?
mtreit
mtreit•2y ago
I'm not sure what your code actually does, but the error says you are trying to serialize that type with XmlSerializer and that is simply not possible.
Pillow
PillowOP•2y ago
ah
Accord
Accord•2y ago
Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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