Serializer fails on System.Text.Encoding objects

[montoner0]

Describe the bug
The Serializer throws NotSupportedException when it hits an Encoding object.
Stack trace:

   at System.Reflection.RuntimeMethodInfo.ThrowNoInvokeException()
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.RuntimePropertyInfo.GetValue(Object obj, Object[] index)
   at YamlDotNet.PropertyInfoExtensions.ReadValue(PropertyInfo property, Object target)
   at YamlDotNet.Serialization.TypeInspectors.ReadablePropertiesTypeInspector.ReflectionPropertyDescriptor.Read(Object target)
   at YamlDotNet.Serialization.YamlAttributeOverridesInspector.OverridePropertyDescriptor.Read(Object target)
   at YamlDotNet.Serialization.PropertyDescriptor.Read(Object target)
   at YamlDotNet.Serialization.ObjectGraphTraversalStrategies.FullObjectGraphTraversalStrategy.TraverseProperties[TContext](IObjectDescriptor value, IObjectGraphVisitor`1 visitor, TContext context, Stack`1 path, ObjectSerializer serializer)
   at YamlDotNet.Serialization.ObjectGraphTraversalStrategies.FullObjectGraphTraversalStrategy.TraverseObject[TContext](IPropertyDescriptor propertyDescriptor, IObjectDescriptor value, IObjectGraphVisitor`1 visitor, TContext context, Stack`1 path, ObjectSerializer serializer)
   at YamlDotNet.Serialization.ObjectGraphTraversalStrategies.FullObjectGraphTraversalStrategy.Traverse[TContext](IPropertyDescriptor propertyDescriptor, Object name, IObjectDescriptor value, IObjectGraphVisitor`1 visitor, TContext context, Stack`1 path, ObjectSerializer serializer)
   at YamlDotNet.Serialization.ObjectGraphTraversalStrategies.FullObjectGraphTraversalStrategy.YamlDotNet.Serialization.IObjectGraphTraversalStrategy.Traverse[TContext](IObjectDescriptor graph, IObjectGraphVisitor`1 visitor, TContext context, ObjectSerializer serializer)
   at YamlDotNet.Serialization.SerializerBuilder.ValueSerializer.SerializeValue(IEmitter emitter, Object value, Type type)
   at YamlDotNet.Serialization.Serializer.EmitDocument(IEmitter emitter, Object graph, Type type)
   at YamlDotNet.Serialization.Serializer.Serialize(IEmitter emitter, Object graph)
   at YamlDotNet.Serialization.Serializer.Serialize(TextWriter writer, Object graph)
   at YamlDotNet.Serialization.Serializer.Serialize(Object graph)
   at Program.<<Initialize>>d__0.MoveNext() in :line 10
--- End of stack trace from previous location ---
   at Program.<Main>()

To Reproduce

using YamlDotNet.Serialization;

new SerializerBuilder().Build().Serialize(Encoding.ASCII);

[EdwardCooke]

Not all types can be serialized. If a property in the type or one of its referenced types throws an exception on the Get method then it will throw up. For something like this I would recommend one of 2 options, a wrapper class or a custom TypeConverter. We've built a few for the very common ones, like datetime and date and time objects.

YamlDotNet/YamlDotNet/Serialization/Converters/DateTimeConverter.cs

Line 34 in b8ac2a9

public class DateTimeConverter : IYamlTypeConverter

[montoner0]

It would be nice then to throw a more verbose exception, with a description as you've just written. Or add an option to ignore this kind of properties by default.

E.g. that's an exception that System.Text.Json serializer throws:

The type 'System.ReadOnlySpan`1[System.Byte]' of property 'Preamble' on type 'System.Text.Encoding' is invalid for serialization or deserialization because it is a pointer type, is a ref struct, or contains generic parameters that have not been replaced by specific types.