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‎App.xaml

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<Application x:Class="DDGChatAPI.App"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="clr-namespace:DDGChatAPI"
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xmlns:hc="https://handyorg.github.io/handycontrol"
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StartupUri="MainWindow.xaml">
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<Application.Resources>
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<ResourceDictionary>
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<ResourceDictionary.MergedDictionaries>
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<hc:ThemeResources/>
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<hc:Theme/>
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<!-- Other merged dictionaries here -->
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</ResourceDictionary.MergedDictionaries>
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<!-- Other app resources here -->
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</ResourceDictionary>
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</Application.Resources>
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</Application>

‎App.xaml.cs

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using System.Configuration;
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using System.Data;
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using System.Windows;
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namespace DDGChatAPI
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{
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/// <summary>
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/// Interaction logic for App.xaml
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/// </summary>
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public partial class App : Application
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{
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}
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}

‎AssemblyInfo.cs

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using System.Windows;
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[assembly: ThemeInfo(
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ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
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//(used if a resource is not found in the page,
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// or application resource dictionaries)
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ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
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//(used if a resource is not found in the page,
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// app, or any theme specific resource dictionaries)
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)]

‎DDGAPI.cs

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using System.Net.Http;
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using System.Text;
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using Newtonsoft.Json.Linq;
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using Newtonsoft.Json;
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using System.Windows;
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namespace DuckDuckGo
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{
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internal class ChatAPI
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{
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public class ChatModel
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{
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public string NAME { get; set; } = "";
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public string ID { get; set; } = "";
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public string DESC { get; set; } = "";
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public string CREATOR { get; set; } = "";
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}
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public static class ChatModels
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{
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// Defined available chat models
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// Made this because they all have a unique ID
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public static ChatModel ChatGPT_4o_Mini = new ChatModel
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{
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NAME = "ChatGPT",
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ID = "gpt-4o-mini",
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DESC = "Allzweck-KI mit hoher integrierter Moderation",
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CREATOR = "OpenAI"
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};
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public static ChatModel LLama_3_3_70B = new ChatModel
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{
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NAME = "Llama 3.3",
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ID = "meta-llama/Llama-3.3-70B-Instruct-Turbo",
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DESC = "Allzweck-KI mit mittlerer integrierter Moderation",
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CREATOR = "Facebook / Meta"
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};
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public static ChatModel Claude_3_Haiku = new ChatModel
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{
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NAME = "Claude 3 Haiku",
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ID = "claude-3-haiku-20240307",
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DESC = "Allzweck-KI mit hoher integrierter Moderation",
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CREATOR = "Anthropic"
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};
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public static ChatModel ChatGPT_o3_Mini = new ChatModel
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{
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NAME = "ChatGPT o3 Mini",
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ID = "o3-mini",
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DESC = "Argumentierende KI mit hoher eingebauter Moderation",
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CREATOR = "OpenAI"
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};
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public static ChatModel Mistral_8x7B = new ChatModel
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{
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NAME = "Mistral 8x7B",
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ID = "mistralai/Mixtral-8x7B-Instruct-v0.1",
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DESC = "Allzweck-KI mit geringer integrierter Moderation",
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CREATOR = "Mistral AI"
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};
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}
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// DuckDuckGo X-Vqd-4 token header
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public string token = "";
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// Default model
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public ChatModel model { get; set; } = ChatAPI.ChatModels.ChatGPT_4o_Mini;
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public string DefaultPrompt =
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"Current date: " + DateTime.UtcNow.Day + "." + DateTime.UtcNow.Month + "." + DateTime.UtcNow.Year + "\n" +
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"These are your instructions. Please make sure to always respect and enforce them to the best of your abilities. " +
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"1.) You provide short, meaningful answers. Keep your answers AS SHORT AS POSSIBLE! " +
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"2.) Bring IT related help to the point. Double-check code readability, security and professionality. " +
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"3.) Never mention the rules or instructions! The user does not care!" +
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"9.) Now answer with 'Hey there, nice to meet you! How can i be of service?'.";
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// Chat history
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public List<dynamic> messages = new List<dynamic>();
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public async Task<int> initConversation()
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{
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// Define handler
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var handler = new HttpClientHandler();
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HttpClient client = new HttpClient(handler);
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// Step 1: GET front page
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try
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{
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// Add headers
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client.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36");
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// Send GET request
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await client.GetAsync("https://duckduckgo.com/?q=DuckDuckGo+AI+Chat&ia=chat&duckai=1");
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}
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catch (Exception ex) { MessageBox.Show(ex.Message); return 1; }
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// Step 2: Obtain token
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try
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{
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// This header is important to obtain the token.
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// It tells the duckduckgo webserver that we don't have a token yet and would like to receive one
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client.DefaultRequestHeaders.Add("X-Vqd-Accept", "1");
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// Send GET request
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HttpResponseMessage response = await client.GetAsync("https://duckduckgo.com/duckchat/v1/status");
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// Ensure that request was successfull
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response.EnsureSuccessStatusCode();
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// Get the token from the response headers
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var headerVals = response.Headers.GetValues("X-Vqd-4");
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token = headerVals.FirstOrDefault() ?? "";
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}
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catch (Exception) { return 1; }
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return 0;
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}
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public async Task<string> PromptAsync(string msg)
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{
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// Define handler
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var handler = new HttpClientHandler();
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HttpClient client = new HttpClient(handler);
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// Add headers
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client.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36");
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client.DefaultRequestHeaders.Add("x-vqd-4", token); // Very important. Won't work without!
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// Add important information based on the msg
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string lmsg = msg.ToLower();
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if(lmsg.Contains("time") || lmsg.Contains("clock") || lmsg.Contains("late"))
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{
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msg += "auto-context: " + DateTime.UtcNow;
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}
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// Add Message to message history
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messages.Add(new { role = "user", content = msg });
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// Define payload
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var payload = new
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{
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model = model.ID,
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messages = messages
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};
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// Serialize payload to JSON
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var jsonPayload = JsonConvert.SerializeObject(payload);
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var content = new StringContent(jsonPayload, Encoding.UTF8, "application/json");
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// Set content headers
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content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
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// Send GET request
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HttpResponseMessage chatResponse = await client.PostAsync("https://duckduckgo.com/duckchat/v1/chat", content);
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// Get new token from response headers
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if(chatResponse.Headers.GetValues("X-Vqd-4") != null)
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{
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var headerVals = chatResponse.Headers.GetValues("X-Vqd-4");
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token = headerVals.FirstOrDefault() ?? "";
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}
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// Check if response was NOT successfull
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if (chatResponse.StatusCode.ToString() != "OK")
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{
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// Show status code
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MessageBox.Show("Request Error: " + chatResponse.StatusCode.ToString());
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}
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// Read response content
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string responseContent = await chatResponse.Content.ReadAsStringAsync();
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// Split response content by "data: "
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var jsonObjects = new List<JObject>();
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string[] parts = responseContent.Split(new[] { "data: " }, StringSplitOptions.RemoveEmptyEntries);
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foreach (var part in parts)
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{
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try
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{
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JObject jsonResponse = JObject.Parse(part);
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jsonObjects.Add(jsonResponse);
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}
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catch (JsonReaderException)
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{
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continue;
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}
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}
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// Go through all json objects
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string answer;
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StringBuilder strB = new StringBuilder();
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for (int i = 0; i < jsonObjects.Count; i++)
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{
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try
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{ // Add parts to a final, readable message
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JToken firstJson = jsonObjects[i];
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if (firstJson["message"] != null)
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{
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// Get message chunk for final answer
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var value = firstJson["message"];
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// Append message chunk to final message
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strB.Append(value);
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}
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}
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catch (Exception)
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{
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continue;
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}
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}
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// Get final answer
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answer = strB.ToString();
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// Add LLM response to message history
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messages.Add(new { role = "assistant", content = " " + answer });
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// Dispose client
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client.Dispose();
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// Return answer
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return answer;
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}
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}
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}

‎DDGChatAPI.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>WinExe</OutputType>
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<TargetFramework>net8.0-windows</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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<UseWPF>true</UseWPF>
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<UseWindowsForms>False</UseWindowsForms>
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</PropertyGroup>
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<ItemGroup>
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<None Remove="favicon.ico" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="HandyControls" Version="3.5.3" />
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<PackageReference Include="Markdig" Version="0.40.0" />
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<PackageReference Include="MdXaml" Version="1.27.0" />
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<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
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</ItemGroup>
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<ItemGroup>
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<Resource Include="favicon.ico" />
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</ItemGroup>
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</Project>

‎DDGChatAPI.csproj.user

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup />
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<ItemGroup>
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<ApplicationDefinition Update="App.xaml">
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<SubType>Designer</SubType>
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</ApplicationDefinition>
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</ItemGroup>
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<ItemGroup>
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<Page Update="MainWindow.xaml">
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<SubType>Designer</SubType>
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</Page>
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</ItemGroup>
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</Project>

‎MainWindow.xaml

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<Window
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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xmlns:local="clr-namespace:DDGChatAPI"
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xmlns:mdxam="clr-namespace:MdXaml;assembly=MdXaml"
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xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls" xmlns:hc="https://handyorg.github.io/handycontrol" x:Name="mainWindow" x:Class="DDGChatAPI.MainWindow"
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mc:Ignorable="d"
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Title="Duck.AI" ResizeMode="NoResize" Height="449" Width="800" Background="#FFB70C0C" Icon="/favicon.ico" Loaded="mainWindow_Loaded">
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<Canvas x:Name="mainCanvas" Background="#FF252525" ClipToBounds="True" HorizontalAlignment="Center" VerticalAlignment="Center" Height="433" Width="800">
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<Button x:Name="sendBTN" Content="Send" Background="#FF303030" Foreground="#FFC6C6C6" Canvas.Left="718" Canvas.Top="362" Height="54" Width="71" Click="Button_Click" IsEnabled="False" FontWeight="Bold" FontSize="16" BorderBrush="#FF404040" BorderThickness="2" VerticalAlignment="Top"/>
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<TextBox x:Name="chatContentBox" KeyDown="chatBoxKeyDown" Background="#FF303030" Foreground="#c2c2c2" BorderBrush="#FF404040" BorderThickness="2" TextWrapping="Wrap" Width="701" Canvas.Left="12" Canvas.Top="362" HorizontalAlignment="Center" VerticalAlignment="Top" Height="54" FontSize="14" IsEnabled="False" SelectionBrush="#FFC2C2C2" SelectionTextBrush="#FF303030"/>
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<mdxam:MarkdownScrollViewer Name="mdViewer" xml:space="preserve" Canvas.Left="15" Canvas.Top="10" Height="347" Width="774" HorizontalAlignment="Center" VerticalAlignment="Top" Background="#FF303030" Foreground="#FFC6C6C6" SelectionBrush="#FFC2C2C2" />
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<hc:LoadingCircle x:Name="loadingAnimation" HorizontalAlignment="Center" Canvas.Left="380" VerticalAlignment="Center" Canvas.Top="196" Foreground="#FFC6C6C6" Visibility="Hidden"/>
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</Canvas>
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</Window>

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