Merge two Json.NET arrays by concatenating contained elements

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Use JContainer.Merge() with MergeArrayHandling.Concat.

This is available starting with Json.NET 6 Release 4. So if your arrays are in a JContainer (e.g. a JObject), this is a simple and robust solution.

Example:

JObject o1 = JObject.Parse(@"{
  'FirstName': 'John',
  'LastName': 'Smith',
  'Enabled': false,
  'Roles': [ 'User' ]
}");
JObject o2 = JObject.Parse(@"{
  'Enabled': true,
  'Roles': [ 'Operator', 'Admin' ]
}");

o1.Merge(o2, new JsonMergeSettings { MergeArrayHandling = MergeArrayHandling.Concat });

string json = o1.ToString();
// {
//   "FirstName": "John",
//   "LastName": "Smith",
//   "Enabled": true,
//   "Roles": [
//     "User",
//     "Operator",
//     "Admin"
//   ]
// }

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