How Can I Deserialize Complex Nested JSON Data into C# Classes?

Deserialize complex nested JSON data to C# class

In some cases, the API may return JSON data containing multiple levels of nested objects. Deserializing such data into a C# class can be challenging, especially if the object structure does not exactly match the JSON response.

Detailed explanation of the problem

As shown in the example, the provided JSON response contains a root-level "results" object, which contains a "jobcodes" object that contains multiple key-value pairs representing individual job codes. However, the original C# object design only considered one JobCode instance, which resulted in null values ​​being returned when deserialized.

Solution

In order to successfully deserialize complex JSON data, be sure to create a class structure that is exactly the same as the JSON response. In this case:

1. Root Level Object: Requires a "RootObject" class to represent the overall JSON structure and contain a "Results" property.
2. Nested objects: The "Results" class should contain a "jobcodes" property of type Dictionary<string, JobCode>. This reflects the dynamic nature of the "jobcodes" object in the JSON response.
3. JobCode class: The "JobCode" class remains unchanged and represents individual job code details.

Deserialization code

With the right class structure in place, deserialization becomes simple:

<code class="language-csharp">RootObject obj = JsonConvert.DeserializeObject<RootObject>(json);</code>

This line of code deserializes the JSON response to the "RootObject" class, giving you access to its "Results" property and associated job code details.

Return to JobCodes list

To finally retrieve the list of job codes, you can use a simple loop to extract them from the "JobCodes" dictionary:

<code class="language-csharp">List<JobCode> jobCodes = new List<JobCode>();
foreach (KeyValuePair<string, JobCode> jobCode in obj.Results.JobCodes)
{
    jobCodes.Add(jobCode.Value);
}</code>

By following these steps, you can efficiently deserialize complex JSON data containing nested objects into C# classes, making it easier to access and process API responses.

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