C#•3y ago

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

mtreit•8/4/23, 8:03 PM

The error is telling you exactly what the issue is. The type you are trying to serialize needs a parameterless constructor

mtreit•8/4/23, 8:03 PM

Because the serializer uses that to construct an empty instance and then set the properties / fields.

Mmtreit The error is telling you exactly what the issue is. The type you are trying to s...

PillowOP•8/4/23, 8:12 PM

do I not have one right there tho?

mtreit•8/4/23, 8:12 PM

The type in the error is TMXMap not TMXParser

PillowOP•8/4/23, 8:25 PM

I don't think TMXMap has a constructor tho

PPillow I don't think TMXMap has a constructor tho

mtreit•8/4/23, 8:28 PM

That's exactly why you're getting the error.

mtreit•8/4/23, 8:28 PM

It doesn't have one. But if you want to serialize it, it has to have one.

PillowOP•8/4/23, 8:29 PM

so I just can't use that library at all?

mtreit•8/4/23, 8:30 PM

I take it that it's not something you wrote yourself?

PillowOP•8/4/23, 8:44 PM

correct

PPillow correct

mtreit•8/4/23, 8:58 PM

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.

PillowOP•8/4/23, 8:58 PM

so I just.. can't do it?

PPillow oh

mtreit•8/4/23, 9:03 PM

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.

PillowOP•8/4/23, 9:04 PM

Accord•8/5/23, 9:06 PM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.