How to Efficiently Create C# DTOs from Complex JSON Responses in ASP.NET?

In ASP.NET applications, it is often necessary to extract complex JSON response data into DTO (Data Transfer Object). With tools like RestSharp, getting JSON data from APIs is relatively easy, but creating DTOs from complex responses is still a challenge.

Extract Leads as DTOs from JSON response

Assume the following JSON response:

{
  "response": {
    "result": {
      "Leads": {
        "row": [
          {
            "no": "1",
            "FL": [
              {
                "val": "LEADID",
                "content": "101"
              },
              {
                "val": "Company",
                "content": "Test 1"
              }
            ]
          },
          {
            "no": "2",
            "FL": [
              {
                "val": "LEADID",
                "content": "102"
              },
              {
                "val": "Company",
                "content": "Test 2"
              }
            ]
          }
        ]
      }
    },
    "uri": "/crm/private/json/Leads/getRecords"
  }
}

The goal is to extract the list of Leads from this JSON response as DTO, each DTO contains "LEADID" and "Company" attributes.

Solution: Use JSON to generate C# classes

Visual Studio provides a convenient function: "Paste JSON as class", which can automatically generate C# classes based on the JSON structure.

Steps:

1. Copy the JSON response.
2. In Visual Studio, select Edit > Paste Special > Paste JSON as Class.
3. This will generate a C# class that represents the JSON structure.

For the provided JSON response, the following classes will be generated:

public class Rootobject
{
    public Response response { get; set; }
}

public class Response
{
    public Result result { get; set; }
    public string uri { get; set; }
}

public class Result
{
    public Leads Leads { get; set; }
}

public class Leads
{
    public Row[] row { get; set; }
}

public class Row
{
    public string no { get; set; }
    public FL[] FL { get; set; }
}

public class FL
{
    public string val { get; set; }
    public string content { get; set; }
}

Create LeadDto class

Now that we have a C# class, we can define our LeadDto class:

public class LeadDto
{
    public string LeadId { get; set; }
    public string Company { get; set; }
}

Populate the LeadDto list

In order to populate the LeadDto list based on the JSON response, you can use LINQ:

var leads = from response in Rootobject.response.result.Leads.row
            select new LeadDto
            {
                LeadId = response.FL.First(fl => fl.val == "LEADID").content,
                Company = response.FL.First(fl => fl.val == "Company").content
            };

This query will create a list of LeadDto objects, each containing the "LEADID" and "Company" properties extracted from the JSON response.

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