Your problem is that, when deserializing a collection that is not read-only, Json.NET checks to see if the collection has already been allocated, for instance in the constructor of the containing type. If so, it fills the pre-existing collection for the deserialized JSON contents, and never sets the collection back. Unfortunately, your property returns a temporary proxy collection, so your container class SpecialObject
never receives the deserialized results.
The simplest way to prevent this is to specify that Json.NET should always allocate a new collection and set it back rather than reuse the pre-existing collection, via the JsonPropertyAttribute
setting ObjectCreationHandling = ObjectCreationHandling.Replace
[JsonProperty(ObjectCreationHandling = ObjectCreationHandling.Replace)]
public List<string> SpecialObjectIDs { get { return SpecialObjectCollection.Select(x => x.ID).ToList(); } set { tempObjectIDs = value; } }
Alternatively you could use a string []
rather than a List<string>
for your proxy collection property:
public string [] SpecialObjectIDs { get { return SpecialObjectCollection.Select(x => x.ID).ToArray(); } set { tempObjectIDs = value == null ? null : value.ToList(); } }
As arrays cannot be resized, Json.NET will always allocate a new array when deserializing and set it back when complete.
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