添加项目文件。

OneBotController.cs

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+using Microsoft.AspNetCore.Mvc;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OneBotApp.Controllers
+{
+    [ApiController]
+    [Route("onebot")] // 确保路由与LLOneBot配置一致
+    public class OneBotController : ControllerBase
+    {
+        [HttpPost]
+        public async Task<IActionResult> Post([FromBody] dynamic data)
+        {
+            // 检查消息类型是否为私聊消息
+            if (data.message_type == "private")
+            {
+                // 获取消息内容和用户ID
+                var message = data.message;
+                var userId = data.user_id;
+
+                // 检查消息内容是否为"/cx"
+                if (message.ToString().Contains("/cx"))
+                {
+                    // 构建回复消息
+                    var replyMessage = new
+                    {
+                        action = "send_private_msg",
+                        params_ = new
+                        {
+                            user_id = userId,
+                            message = new[]
+                            {
+                                new
+                                {
+                                    type = "text",
+                                    data = new
+                                    {
+                                        text = "Hello"
+                                    }
+                                }
+                            }
+                        }
+                    };
+
+                    // 发送回复消息到OneBot服务器
+                    using (var client = new HttpClient())
+                    {
+                        // 设置超时时间（可选）
+                        client.Timeout = TimeSpan.FromSeconds(10);
+
+                        // 序列化回复消息为JSON字符串
+                        var json = Newtonsoft.Json.JsonConvert.SerializeObject(replyMessage);
+                        // 创建StringContent对象，设置内容类型为application/json
+                        var content = new StringContent(json, Encoding.UTF8, "application/json");
+                        // 发送POST请求到OneBot服务器的action端点
+                        var response = await client.PostAsync("http://localhost:3000/", content);
+
+                        // 检查响应状态码
+                        if (!response.IsSuccessStatusCode)
+                        {
+                            // 记录错误信息
+                            var errorContent = await response.Content.ReadAsStringAsync();
+                            Console.WriteLine($"Error sending message to OneBot server: {errorContent}");
+                        }
+                    }
+                }
+            }
+
+            // 返回200 OK响应
+            return Ok();
+        }
+    }
+}

Program.cs

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+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Newtonsoft.Json.Serialization;
+
+// 创建WebApplicationBuilder实例，用于配置应用
+var builder = WebApplication.CreateBuilder(args);
+
+// 添加控制器服务，并配置JSON序列化选项
+builder.Services.AddControllers()
+    .AddNewtonsoftJson(options =>
+    {
+        // 使用DefaultContractResolver以保留属性名的大小写
+        options.SerializerSettings.ContractResolver = new DefaultContractResolver();
+    });
+
+// 注册HttpClient
+builder.Services.AddHttpClient();
+
+// 构建WebApplication实例
+var app = builder.Build();
+
+// 配置HTTP请求管道
+if (app.Environment.IsDevelopment())
+{
+    // 如果是开发环境，启用开发者异常页面，方便调试
+    app.UseDeveloperExceptionPage();
+}
+
+// 启用路由中间件，用于处理路由
+app.UseRouting();
+
+// 启用授权中间件，用于处理授权
+app.UseAuthorization();
+
+// 将控制器映射到路由
+app.MapControllers();
+
+// 启动应用
+app.Run();

QQBot.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="9.0.5" />
+  </ItemGroup>
+
+</Project>

QQBot.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36202.13 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QQBot", "QQBot.csproj", "{7BC0E27B-5563-4BEF-8DE2-35179FFC531E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7BC0E27B-5563-4BEF-8DE2-35179FFC531E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7BC0E27B-5563-4BEF-8DE2-35179FFC531E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7BC0E27B-5563-4BEF-8DE2-35179FFC531E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7BC0E27B-5563-4BEF-8DE2-35179FFC531E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C03E1308-61BA-46DD-8C5B-65B7A711BD6D}
+	EndGlobalSection
+EndGlobal