{"record":{"id":"5c33ef43753f37dd","repo":"stride3d/stride","slug":"unable-to-find-a-serializer-for-the-type-typedescriptor-type","errorCode":null,"errorMessage":"Unable to find a serializer for the type [{typeDescriptor.Type}]","messagePattern":"Unable to find a serializer for the type \\[(.+?)\\]","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/core/Stride.Core.Yaml/Serialization/SerializerFactorySelector.cs","lineNumber":69,"sourceCode":"                serializerLock.EnterWriteLock();\n                if (!serializers.TryGetValue(typeDescriptor.Type, out serializer))\n                {\n                    foreach (var factory in factories)\n                    {\n                        serializer = factory.TryCreate(context, typeDescriptor);\n                        if (serializer != null)\n                        {\n                            serializers.Add(typeDescriptor.Type, serializer);\n                            break;\n                        }\n                    }\n                }\n                serializerLock.ExitWriteLock();\n            }\n\n            if (serializer == null)\n            {\n                throw new InvalidOperationException($\"Unable to find a serializer for the type [{typeDescriptor.Type}]\");\n            }\n\n            return serializer;\n        }\n\n        /// <summary>\n        /// Indicates whether the given factory is supported by this selector.\n        /// </summary>\n        /// <param name=\"factory\">The factory to evaluate.</param>\n        /// <returns>True if the factory can be added to this selector, False otherwise.</returns>\n        protected abstract bool CanAddSerializerFactory(IYamlSerializableFactory factory);\n    }\n}\n","sourceCodeStart":51,"sourceCodeEnd":83,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/core/Stride.Core.Yaml/Serialization/SerializerFactorySelector.cs#L51-L83","documentation":"GetSerializer throws InvalidOperationException when, even after querying and adding every registered IYamlSerializableFactory, no IYamlSerializable could be produced for the requested type. It means the type is not covered by any built-in or registered serializer factory.","triggerScenarios":"Deserializing/serializing a type for which no factory returns a serializer — e.g. exotic generic constructs, interfaces without registered handling, types excluded by CanAddSerializerFactory, or a custom factory that returns null from TryCreate.","commonSituations":"Adding new asset/data types to a Stride project without registering serializers; third-party types in your data model; types whose descriptors were altered by custom TypeDescriptorFactory configuration; regressions after upgrading the library.","solutions":["Implement an IYamlSerializable (or factory) for the type and register it via TryAddFactory before sealing.","Check whether the type is supported by the built-in serializers (primitives, collections, data contracts); if not, register a custom one.","Inspect typeDescriptor.Type in the message to confirm exactly which type lacks a serializer.","Ensure the factory's CanAddSerializerFactory/TryCreate logic accepts the type (fix overly strict filters).","Add [DataContract]/[DataMember] or a YamlSerializer override for the type as appropriate."],"exampleFix":"// before\nselector.TryAddFactory(new BuiltinFactory());\nselector.Seal();\n// Deserialize(typeof(MyCustomType)) -> \"Unable to find a serializer for the type [MyCustomType]\"\n// after\nselector.TryAddFactory(new BuiltinFactory());\nselector.TryAddFactory(new MyCustomTypeSerializerFactory());\nselector.Seal();","handlingStrategy":"validation","validationCode":"// pre-flight: ensure every model type has a serializer\nforeach (var t in modelTypes)\n    if (!supportedTypes.Contains(t)) throw new InvalidOperationException($\"No YAML serializer registered for {t}\");","typeGuard":null,"tryCatchPattern":"try { return serializer.Deserialize(reader, type); }\ncatch (InvalidOperationException ex) when (ex.Message.StartsWith(\"Unable to find a serializer\"))\n{\n    throw new NotSupportedException($\"Type {type} needs a custom IYamlSerializableFactory registered before sealing\", ex);\n}","preventionTips":["Register custom factories for all non-standard types before Seal()","Keep data model types simple/data-contract friendly","Run a smoke test that serializes/deserializes every model type at startup","Read the type name from the message to identify the missing serializer quickly","Re-check factory filters (CanAddSerializerFactory/TryCreate) after upgrades"],"tags":["yaml","serializer-factory","unsupported-type"],"backgroundTag":"unsupported-operation","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}