Deserialize fails for keys with newline

[JKostov]

When using a complex key, that has newline char the serialization is successful but deserialization fails.

YAML example:

? >-
  key

  a

  b
: >-
  value

  a

  b

Code:

using YamlDotNet.Serialization;

var serializer = new SerializerBuilder().Build();
var deserializer = new DeserializerBuilder().Build();

var data = new Dictionary<string, string>();
data.Add("key\na\nb", "value\na\nb");

var serialized = serializer.Serialize(data);

var deserialized = deserializer.Deserialize<Dictionary<string, string>>(serialized);

The version of the YamlDotNet package that I'm using is 11.2.1.

Exception:

(Line: 1, Col: 1, Idx: 0) - (Line: 1, Col: 1, Idx: 0): Exception during deserialization -> Value cannot be null. (Parameter 'key')

[EdwardCooke]

I'm going to see if this is even valid yaml, It still throws in the latest code, however the following works:

? >-
  key

  a

  b: >-
  value

  a

  b

Notice where the :, on the same line as b. I'll let you know what I find out.

[EdwardCooke]

K, it is valid, digging in to the code to determine why it's failing.

[EdwardCooke]

This fix will go out in the next release.