create dictionary from json [duplicate]

Question

I have some json that looks like this:

"lines": 
{
    "0010": {
        "ProvCountyCode": "047",
        "ProvNo": "770887",
        "ParNonparCode": "K",
        "ParNonparCode2": "K",
    }, 
    "0020" {
        "ProvCountyCode": "047",
        "ProvNo": "0888",
        "ParNonparCode": "K",
        "ParNonparCode2": "K",
    },
              ...

Visual Studio (C#) "Paste Special / Classes from JSON" creates something like this:

public class Lines
{
    public _0010 _0010 { get; set; }
    public _0020 _0020 { get; set; }
}

public class _0010
{
    public string ProvCountyCode { get; set; }
    public string ProvNo { get; set; }
    public string ParNonparCode { get; set; }
    public string ParNonparCode2 { get; set; }
}

public class _0020 
{
    public string ProvCountyCode { get; set; }
    public string ProvNo { get; set; }
    public string ParNonparCode { get; set; }
    public string ParNonparCode2 { get; set; }
}

// ...

This doesn't look very useful to me. Further down, there is a json array called lineSummary that includes a value LineID.

I am thinking I want to reference the dictionary like this:

Lines[LineId]

I can't change the JSON. I am looking to create a class that accomodates it

You can you a dictionary as-is: public class public class Lines { public Dictionary<string, Line> lines { get; set; } = new(); }. The property names (here "0010" and "0020") will become the keys. Works with both System.Text.Json and Newtonsoft. — dbc
– dbc, Commented Apr 7 at 23:40
Which serializer are you using? If you are using System.Text.Json see How to deserialize objects having different keys (names) but identical structure in C# .Net 8 using System.Text.Json.Serialization?. — dbc
– dbc, Commented Apr 7 at 23:46
For Newtonsoft see Deserializing JSON when key values are unknown or Deserializing JSON with unknown object names or Create a strongly typed c# object from json object with ID as the name or Parsing JSON Object with variable properties into strongly typed object. — dbc
– dbc, Commented Apr 7 at 23:46

marc_s · Accepted Answer · 2026-04-08 16:47:29Z

0

As said by dbc, you can use a dictionary just like JSON:

public class Lines 
{ 
    public Dictionary<string, Line> lines { get; set; } = new(); 
}

The property names (here 0010 and 0020) will become the keys. This works with both System.Text.Json and Newtonsoft.

edited Apr 8 at 16:47

marc_s

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answered Apr 7 at 23:44

user32587615

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