How to Deserialize JSON with Dynamic Keys in C#?

Dynamic Keys in JSON Deserialization

When dealing with JSON data containing dynamic keys, accessing object properties can be challenging. Consider the following data:

{
    "users" : {
        "100034" : {
            "name"  : "tom",
            "state" : "WA",
            "id"    : "cedf-c56f-18a4-4b1"
        },
        "10045" : {
            "name"  : "steve",
            "state" : "NY",
            "id"    : "ebb2-92bf-3062-7774"
        },
        "12345" : {
            "name"  : "mike",
            "state" : "MA",
            "id"    : "fb60-b34f-6dc8-aaf7"
        }
    }
}

In this JSON object, the keys are numeric strings, making it difficult to define classes with static property names. To resolve this, we can leverage the Dictionary type in C#, where T represents the class for our item data.

Class Structure and Deserialization

We define the following classes:

class RootObject
{
    public Dictionary<string, User> users { get; set; }
}

class User
{
    public string name { get; set; }
    public string state { get; set; }
    public string id { get; set; }
}

Then, we can deserialize the JSON data like so:

RootObject obj = JsonConvert.DeserializeObject<RootObject>(json);

This creates a RootObject instance with a Dictionary named users.

Accessing Object Properties

We can now access the object properties using the dictionary keys. The following code iterates through the users:

foreach (string key in root.users.Keys)
{
    User user = root.users[key];
    // Access properties using user.name, user.state, etc.
}

Output:

key: 10045
name: steve
state: NY
id: ebb2-92bf-3062-7774

key: 12345
name: mike
state: MA
id: fb60-b34f-6dc8-aaf7

key: 100034
name: tom
state: WA
id: cedf-c56f-18a4-4b1

This approach allows us to deserialize JSON data with dynamic keys and access object properties seamlessly.

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