Json deserialize object array with dynamic property names

Question

I want to deserialize a json object in c# using JsonSerializer.Deserialize of System.Text.Json. The json looks like this:

{
   "id":10,
   "authorization_ids":[
      
   ],
   "karma_user_ids":[
      2
   ],
   "group_ids":{
      "2":[
         "full"
      ],
      "4":[
         "read"
      ],
      "5":[
         "overview"
      ],
      "7":[
         "change",
         "overview"
      ],
      "10":[
         "create"
      ]
   }
}

But the property group_ids contains objects with dynamic property names that actually correspond to the ID of a group.

{
  2  : {full}
  4  : {read}
  5  : {overview}
  7  : {change, overview}
  10 : {create}
}

Now I want to deserialize group_ids to an object like this:

public class GroupPermission
{
    public int GroupID { get; set; }
    public Permission Permission { get; set; }

    public GroupPermission() { }
}

[Flags]
public enum Permission
{
    full = 1,
    read = 2,
    overview = 4,
    change = 8,
    create = 16
}

Is this possible? Can someone point me the right direction?

Can you please add full JSON with group_ids JSON data? Not clear its behavior — Sachith Wickramaarachchi
– Sachith Wickramaarachchi, Commented Oct 24, 2021 at 18:13
@SachithWickramaarachchi Tanks, but what do you mean? The json of group_ids is the second json code block above. But I added a comment to make it more clear. — B4DschK4Pp
– B4DschK4Pp, Commented Oct 24, 2021 at 18:25
Neither block 1 nor block 2 is valid JSON. Please show your actual JSON — Charlieface
– Charlieface, Commented Oct 24, 2021 at 20:42
@Charlieface right... Sorry. Updated the thread and added the json. — B4DschK4Pp
– B4DschK4Pp, Commented Oct 24, 2021 at 21:00
Does this answer your question? json deserialization to C# with dynamic keys In this case, group_ids should be deserialized to Dictionary<int, List<string>> and the dictionary keys are the IDs — Charlieface
– Charlieface, Commented Oct 24, 2021 at 21:28

PuzzledScratch · Accepted Answer · 2021-10-25 00:57:19Z

1

Should be something like this:

    public class RootObject
    {
        [JsonPropertyName("id")]
        public int Id {get;set;}

        [JsonPropertyName("authorization_ids")]
        public List<int> AuthorizationIds {get;set;}
        
        [JsonPropertyName("karma_user_ids")]
        public List<int> KarmaUserIds {get;set;}

        [JsonPropertyName("group_ids")]
        public Dictionary<int, List<string>> GroupIds {get;set;}

        public RootObject()
        {
            AuthorizationIds = new List<int>();
            KarmaUserIds = new List<int>();
            GroupIds = new Dictionary<int, List<string>>();
        }
    }

To test it:

public static void Main(string[] args)
{
    var json = File.ReadAllText("./file.json");
    var objs = JsonSerializer.Deserialize<RootObject>(json);
}

answered Oct 25, 2021 at 0:57

PuzzledScratch

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