如何手动创建嵌套的POST参数？（例如，我在.Net中创建请求以联系Rails后端）

public class NestedParams
{
    public string Key1 { get; set; }
    public string Key2 { get; set; }
    public string Key3 { get; set; }
}

var nestedParams = new NestedParams
{
    Key1 = "value1",
    Key2 = "value2",
    Key3 = "value3"
};

var jsonString = System.Text.Json.JsonSerializer.Serialize(nestedParams);

using var httpClient = new HttpClient();

var content = new StringContent(jsonString, Encoding.UTF8, "application/json");

var response = await httpClient.PostAsync("https://your-rails-backend.com/api/endpoint", content);

def create
  nested_params = params.require(:nested_params)
  key1 = nested_params[:key1]
  key2 = nested_params[:key2]
  key3 = nested_params[:key3]

  # ...
end