下边的代码，创建控制台应用后直接Copy就OK，替换apiKey

using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;
using System.IO;
using System.Threading;
using System.Net.Http.Headers;

class Program
{
    private static readonly string apiKey = "apiKey";
    private static readonly string apiUrl = "https://api.deepseek.com/v1/chat/completions";

    static async Task Main(string[] args)
    {
        while (true)
        {
            Console.WriteLine("请输入您的问题：");
            var question = Console.ReadLine();
            if (question.ToLower() == "exit")
            {
                break;
            }
            if (string.IsNullOrEmpty(question.Trim()))
            {
               continue; 
            }
            await SendToDeepSeek(question);
            Console.WriteLine("\n\n");
        }
    }

    static async Task SendToDeepSeek(string question)
    {
        var requestData = new
        {
            model = "deepseek-chat",
            messages = new[]
            {
                new { role = "user", content = question }
            },
            stream = true,  // 添加流式传输参数
            max_tokens = 8192
        };

        try
        {
            await CallDeepSeekAPIStreaming(requestData);
        }
        catch (Exception ex)
        {
            Console.WriteLine($"\nError: {ex.Message}");
        }
    }

    static async Task CallDeepSeekAPIStreaming(object requestData)
    {
        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Add("Authorization", $"Bearer {apiKey}");
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            var jsonContent = JsonConvert.SerializeObject(requestData);
            var httpContent = new StringContent(jsonContent, Encoding.UTF8, "application/json");

            using (var request = new HttpRequestMessage(HttpMethod.Post, apiUrl)
            {
                Content = httpContent
            })
            using (var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead))
            using (var stream = await response.Content.ReadAsStreamAsync())
            using (var reader = new StreamReader(stream))
            {
                while (!reader.EndOfStream)
                {
                    var line = await reader.ReadLineAsync();
                    if (string.IsNullOrWhiteSpace(line)) continue;

                    // 处理事件流格式
                    if (line.StartsWith("data: "))
                    {
                        var jsonData = line.Substring(6).Trim();
                        if (jsonData == "[DONE]") break;

                        var chunk = JsonConvert.DeserializeObject<StreamChatResponse>(jsonData);
                        var content = chunk?.choices?.FirstOrDefault()?.delta?.content;

                        if (!string.IsNullOrEmpty(content))
                        {
                            Console.Write(content);
                            // 若需要模拟逐字效果，可添加延迟
                            await Task.Delay(50);
                        }
                    }
                }
            }
        }
    }

    public class StreamChatResponse
    {
        public Choice[] choices { get; set; }
        public class Choice
        {
            public Delta delta { get; set; }
        }
        public class Delta
        {
            public string content { get; set; }
        }
    }
}