Deserialize Json string to Enum C#

Question

I am writing a test on a custom version of stringEnumConverter. But my test keeps throwing when I deserialize. I searched over stack overflow, but could not find what I did wrong. Following is a sample of what I'm doing:

namespace ConsoleApp2 { [Flags] [JsonConverter(typeof(StringEnumConverter))] enum TestEnum { none = 0, obj1 = 1, obj2 = 2 } class Program { static void Main(string[] args) { var jsonString = "{none}"; var deserializedObject = JsonConvert.DeserializeObject<TestEnum>(jsonString); } } }

The exception I get on the deserialize line is Unexpected token StartObject when parsing enum.

I suspect it might be because I am representing the json string wrong, I also tried "{\"none\"}", "{\"TestEnum\":\"none\"}", "{TestEnum:none}", "{none}" and "none".

{none} is not a valid json to begin with.

Xiaoy312
– Xiaoy312

2019-05-30 22:30:34 +00:00
Commented May 30, 2019 at 22:30 — Xiaoy312
– Xiaoy312, Commented May 30, 2019 at 22:30
A valid json would be something like: {test: none}

Xiaoy312
– Xiaoy312

2019-05-30 22:31:21 +00:00
Commented May 30, 2019 at 22:31 — Xiaoy312
– Xiaoy312, Commented May 30, 2019 at 22:31

Cristián Ormazábal · Accepted Answer · 2019-06-06 20:08:01Z

{none} is not valid JSON, but 'none' is valid!

You should try the following:

public class Program { public static void Main() { Console.WriteLine("Hello World"); var jsonString = "'none'"; var deserializedObject = JsonConvert.DeserializeObject<TestEnum>(jsonString); Console.WriteLine(deserializedObject); } }

Cheers!

Nicholas Carey · Accepted Answer · 2019-05-31 01:07:07Z

If you serialize TestEnum.none into JSON, the result is "none". A string is perfectly valid JSON.

Your JSON isn't even valid JSON: * It is an object, * containing key (but keys must be quoted with double quoted), * that carries no value. (and an object key must have a value)

So... try something like this:

var jsonString = "\"none\""; var deserializedObject = JsonConvert.DeserializeObject<TestEnum>(jsonString);

But you shouldn't have to write a custom serializer. JSON.Net will do it for you. See

.NET - JSON serialization of enum as string

But if you want to deserialize an object containing your enum, you'll want something along these lines:

{ "enumKey" : "none" }

Which would be something like this in your test:

var jsonString = "{ \"enumKey\" : \"none\" }";

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