Make JsonPropertyAttribute allow multiple usages on same property

Hi,

I need to deserialize a series of documents that are almost similar but might change few details.

I was hoping to spare myself the need of creating multiple classes by decorating the same target property with more instances of the JsonPropertyAttribute but this is not possible.

Ideally it would be nice to be able to do something like

public class ResultList<T>
{
	[JsonProperty("items")]
	[JsonProperty("values")]
	[JsonProperty("results")]
	public IReadOnlyList<T> Items { get; set; }
	
	[JsonProperty("hasMore")]
	[JsonProperty("has-more")]
	public bool HasMore { get; set; }
	
	[JsonProperty("offset")]
	public long? Offset { get; set; }
}

Since most of the time this happens when deserializing a result list, the ambiguity introduced when serializing wouldn’t a big issue. In that case, picking the value of the first attribute found would be good enough.

[hazeb03]

A simple solution which does not require a converter: just add a second, private property to your class, mark it with [JsonProperty(“name2”)], and have it set the first property:

public class Specifications { [JsonProperty(“name1”)] public string CodeModel { get; set; }

[JsonProperty("name2")]
private string CodeModel2 { set { CodeModel = value; } }

}

Ref https://stackoverflow.com/questions/43714050/multiple-jsonproperty-name-assigned-to-single-property

[Stefan-1313]

This could be implemented by creating an attribute called JsonAlias. We can have multiple JsonAlias attributes which would all map to the variable when deserializing. However, the JsonProperty is still allowed to be used only once, and will be used for serialization. This would also prevent any ambiguity.

We then would get something like (based on the example in the first post of this issue):

public class ResultList<T>
{
	[JsonProperty("items")]
	[JsonAlias("values")]
	[JsonAlias("results")]
	public IReadOnlyList<T> Items { get; set; }
	
	[JsonProperty("hasMore")]
	[JsonAlias("has-more")]
	public bool HasMore { get; set; }
	
	[JsonProperty("offset")]
	public long? Offset { get; set; }
}

This idea is taken from here: https://stackoverflow.com/a/70781282/7568866