How to Create Strongly Typed C# Objects from JSON with IDs as Keys?

Use the ID as the name to create a strong type C# object from JSON

When encounters an API response like a JSON object, the ID number is used as a identifier for data, and it may be difficult to create a strong type C# object to deal with them. Let us solve this problem.

Consider the following JSON response:

In order to create a strong type object, we define:

<code class="language-json">{
    "5234592":{
        "pollsAndSurveys":{
            "questionsAsked":1,
            ...
            "pollCount":2},
        "attendance":{
            "averageAttendanceTimeSeconds":253,
            ...
            "percentageAttendance":100}
        },
    "5235291":{
        "pollsAndSurveys":{
            "questionsAsked":2,
            ...
            "pollCount":0},
        "attendance":{
            "averageAttendanceTimeSeconds":83,
            ...
            "percentageAttendance":100}
        }
}</code>

However, we face a question: the root object in JSON does not match the

<code class="language-csharp">public class AttendanceStatistics
{
    [JsonProperty(PropertyName = "registrantCount")]
    public int RegistrantCount { get; set; }

    // 其他属性
}

public class PollsAndSurveysStatistics
{
    [JsonProperty(PropertyName = "pollCount")]
    public int PollCount { get; set; }

    // 其他属性
}

public class SessionPerformanceStats
{
    [JsonProperty(PropertyName = "attendance")]
    public AttendanceStatistics Attendance { get; set; }

    [JsonProperty(PropertyName = "pollsAndSurveys")]
    public PollsAndSurveysStatistics PollsAndSurveys { get; set; }
}

public class WebinarPerformanceStats
{
    public List<SessionPerformanceStats> Stats { get; set; }
}</code>

type we expect.

WebinarPerformanceStats In order to solve this problem, we can use the dictionary as the root object:

JSON.NET effectively handles the serialization and device of the dictionary to convert the attribute name into a dictionary key. In this case, the ID number will be carried out into a dictionary key. If you are willing, you can declare them as long integer:

<code class="language-csharp">var dictionary = JsonConvert.DeserializeObject<Dictionary<string, SessionPerformanceStats>>(theJsonResponse);</code>

Through this method, you can now transform the JSON response to the backward

<code class="language-csharp">var dictionary = JsonConvert.DeserializeObject<Dictionary<long, SessionPerformanceStats>>(theJsonResponse);</code>

or

, where the ID number is used as a key to access a single session statistics. Dictionary<string, SessionPerformanceStats>

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