Consume ChatGPT Open AI API Inside .Net Core Application Using Razor Pages

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace OpenAI_Quickstart.Pages;

public class IndexModel : PageModel
{
    private readonly ILogger<IndexModel> _logger;

    public IndexModel(ILogger<IndexModel> logger)
    {
        _logger = logger;
    }

    [BindProperty]
    public string AnimalInput { get; set; }
    public string Result { get; set; }

    public async Task<IActionResult> OnPostAsync()
    {
        try
        {

            HttpClient client = new HttpClient();
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "YOUR_API_KEY_GOES_HERE");

            var request = new OpenAIRequest
            {
                Model = "text-davinci-002",
                Prompt = generatePrompt(AnimalInput), //$"Name my {AnimalInput}",
                Temperature = 0.7f,
                MaxTokens = 50
            };
            var json = JsonSerializer.Serialize(request);
            var content = new StringContent(json, Encoding.UTF8, "application/json");
            var response = await client.PostAsync("https://api.openai.com/v1/completions", content);
            var resjson = await response.Content.ReadAsStringAsync();
            if (!response.IsSuccessStatusCode)
            {
                var errorResponse = JsonSerializer.Deserialize<OpenAIErrorResponse>(resjson);
                throw new System.Exception(errorResponse.Error.Message);
            }
            //var data = JsonSerializer.Deserialize<OpenAIResponse>(resjson);
            var data = JsonSerializer.Deserialize<Root>(resjson);
            //var data = JsonSerializer.Deserialize(resjson, typeof(object));
            Result = data.choices[0].text;
        }
        catch (System.Exception ex)
        {
            _logger.LogError(ex, "An error occurred while making the OpenAI API request");
            Result = $"An error occurred: {ex.Message}";
        }
        return Page();
    }
    public string generatePrompt(string animal)
    {
        var capitalizedAnimal = animal.Trim();
        return "Suggest three names for an animal that is a superhero." +
                "Animal: Cat" +
                "Names: Captain Sharpclaw, Agent Fluffball, The Incredible Feline" +
                "Animal: Dog" +
                "Names: Ruff the Protector, Wonder Canine, Sir Barks - a - Lot" +
                "Animal: " + capitalizedAnimal + " " +
                "Names:";
    }
}
public class Choice
{
    public string text { get; set; }
    public int index { get; set; }
    public object logprobs { get; set; }
    public string finish_reason { get; set; }
}
public class Root
{
    public string id { get; set; }
    public string @object { get; set; }
    public int created { get; set; }
    public string model { get; set; }
    public List<Choice> choices { get; set; }
    public Usage usage { get; set; }
}
public class Usage
{
    public int prompt_tokens { get; set; }
    public int completion_tokens { get; set; }
    public int total_tokens { get; set; }
}
public class OpenAIChoice
{
    public string text { get; set; }
    public float probability { get; set; }
    public float[] logprobs { get; set; }
    public int[] finish_reason { get; set; }
}
public class OpenAIRequest
{
    [JsonPropertyName("model")]
    public string Model { get; set; }

    [JsonPropertyName("prompt")]
    public string Prompt { get; set; }

    [JsonPropertyName("temperature")]
    public float Temperature { get; set; }

    [JsonPropertyName("max_tokens")]
    public int MaxTokens { get; set; }
}
public class OpenAIErrorResponse
{
    [JsonPropertyName("error")]
    public OpenAIError Error { get; set; }
}
public class OpenAIError
{
    [JsonPropertyName("message")]
    public string Message { get; set; }

    [JsonPropertyName("type")]
    public string Type { get; set; }

    [JsonPropertyName("param")]
    public string Param { get; set; }

    [JsonPropertyName("code")]
    public string Code { get; set; }
}

This is the index.cshtml razor page

@page
@model OpenAI_Quickstart.Pages.IndexModel
@{
    ViewData["Title"] = "pet name generator";
}

<h1>OpenAI Quickstart - pet name generator</h1>
<hr />
<br />

<form method="post">
    <div>
        <label for="animal-input">Enter an animal:</label>
        <input id="animal-input" type="text" name="AnimalInput" value="@Model.AnimalInput" />
    </div>
    <div>
        <button type="submit">Generate names</button>
    </div>
</form>
<br/>
<br/>

@if (!string.IsNullOrEmpty(Model.Result))
{
    <div>
        <h3>Result:</h3>
        <p style="color:blue">@Model.Result</p>
    </div>
}

Output

For more info, visit the official site of Chat GPT https://platform.openai.com/

!!! Happy Coding !!!