Github Copilot Chat 初体验开发者社区

Github Copilot Chat 初体验

Copilot Chat是 Microsoft的GitHub Copilot AI的一种特性，允许开发人员使用文本输入与AI交互，并实时获得代码建议和补全。Copilot Chat是一种旨在通过提供基于检测到的代码模式的建议来增强开发人员的生产力的工具。Copilot Chat使用机器学习算法识别模式并为各种编程活动建议代码片段。它还具有学习上一个用户交互的能力，随着时间的推移将变得更加准确。如果您需要使用Copilot Chat获取帮助进行开发工作，请在有具体问题的情况下描述清晰问题的场景与具体需求，以便我更好地帮助您。

The maximum value of an int in C# is 2,147,483,647 (or 0x7FFFFFFF in hexadecimal). This is because an int in C# is a signed 32-bit integer, meaning it can hold values between -2,147,483,648 and 2,147,483,647 inclusive.
Here's an example of assigning int.MaxValue to a variable in C#:
int maxVal = int.MaxValue;
This creates a new variable called maxVal of type int and assigns it the value of the maximum possible integer.

using System.Net.WebSockets;
using System.Threading.Tasks;
public async Task ConnectWebSocketAsync(string url) {
    using (ClientWebSocket ws = new ClientWebSocket()) {
        await ws.ConnectAsync(new System.Uri(url), CancellationToken.None);
        await Task.WhenAll(Receive(ws), Send(ws));
private static async Task Receive(ClientWebSocket ws) {
    byte[] buffer = new byte[1024 * 4];
    while (ws.State == WebSocketState.Open) {
        var result = await ws.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
        if (result.MessageType == WebSocketMessageType.Close) {
            await ws.CloseAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);
        } else {
            // Process received data.
private static async Task Send(ClientWebSocket ws) {
    while (ws.State == WebSocketState.Open) {
        // Get data to send.
        byte[] buffer = new byte[1024 * 4];
        var result = await ws.SendAsync(new ArraySegment<byte>(buffer), WebSocketMessageType.Text, true, CancellationToken.None);
        await Task.Delay(2000);
}

ConfigClient is a class that allows the management and retrieval of configuration data. The class has methods that load configurations from a server and save them to a local storage. The configuration is typically represented in key/value pairs. The Get method is used to retrieve a particular key, and the GetGroup method is used to retrieve all keys under a common group name.
Here's an example usage of the ConfigClient class:
var config = new ConfigClient();
var result = config.Get("keyName");
This creates a new instance of the ConfigClient object and retrieves the value associated with the specified "keyName" string.

public class ToDo
    public int Id { get; set; }
    public string Task { get; set; }
}

public class ToDo
    public int Id { get; set; }
    public string Task { get; set; }
    public bool Completed { get; set; }
}

using Microsoft.EntityFrameworkCore;
using System;
public class MyContext : DbContext
    public MyContext(DbContextOptions<MyContext> options) : base(options)
    public DbSet<MyEntity> MyEntities { get; set; }
}

using Microsoft.EntityFrameworkCore;
using System;
public class TodoContext : DbContext
    public TodoContext(DbContextOptions<TodoContext> options) : base(options)
    public DbSet<ToDo> ToDos { get; set; }
}

using Microsoft.EntityFrameworkCore;
using System;
public class TodoContext : DbContext
    public TodoContext(DbContextOptions<TodoContext> options) : base(options)
    public DbSet<ToDo> ToDos { get; set; }
    protected override void OnConfiguring(DbContextOptionsBuilder options)
        => options.UseSqlite("Data Source=todos.db");
}

using Microsoft.EntityFrameworkCore;
using System;
public class TodoContext : DbContext
    public DbSet<ToDo> ToDos { get; set; }
    protected override void OnConfiguring(DbContextOptionsBuilder options)
        => options.UseSqlite("Data Source=todos.db");
}

public class ToDoService
    private readonly TodoContext _context;
    public ToDoService(TodoContext context)
        _context = context;
    public List<ToDo> GetToDos()
        return _context.ToDos.ToList();
    public ToDo GetToDoById(int id)
        return _context.ToDos.Find(id);
    public void AddToDo(ToDo todo)
        _context.ToDos.Add(todo);
        _context.SaveChanges();
    public void UpdateToDoById(int id, ToDo todo)
        var existingTodo = _context.ToDos.Find(id);
        if (existingTodo != null)
            existingTodo.Task = todo.Task;
            existingTodo.Completed = todo.Completed;
            _context.SaveChanges();
    public void RemoveToDoById(int id)
        var existingTodo = _context.ToDos.Find(id);
        if (existingTodo != null)
            _context.ToDos.Remove(existingTodo);
            _context.SaveChanges();
}

using CopilotChatPreview;
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
public class ToDoService
    private readonly TodoContext _context;
    public ToDoService(TodoContext context)
        _context = context;
    public async Task<List<ToDo>> GetToDos()
        return await _context.ToDos.ToListAsync();
    public async Task<ToDo> GetToDoById(int id)
        return await _context.ToDos.FindAsync(id);
    public async Task AddToDoAsync(ToDo todo)
        _context.ToDos.Add(todo);
        await _context.SaveChangesAsync();
    public async Task UpdateToDoByIdAsync(int id, ToDo todo)
        var existingTodo = await _context.ToDos.FindAsync(id);
        if (existingTodo != null)
            existingTodo.Task = todo.Task;
            existingTodo.Completed = todo.Completed;
            await _context.SaveChangesAsync();
    public async Task RemoveToDoByIdAsync(int id)
        var existingTodo = await _context.ToDos.FindAsync(id);
        if (existingTodo != null)
            _context.ToDos.Remove(existingTodo);
            await _context.SaveChangesAsync();
}

using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
[ApiController]
[Route("[controller]")]
public class ToDoController : ControllerBase
    private readonly ToDoService _toDoService;
    public ToDoController(ToDoService toDoService)
        _toDoService = toDoService;
    [HttpGet]
    public async Task<ActionResult<List<ToDo>>> GetAllToDos()
        return await _toDoService.GetToDos();
    [HttpGet("{id}")]
    public async Task<ActionResult<ToDo>> GetToDoById(int id)
        var todo = await _toDoService.GetToDoById(id);
        if (todo == null)
            return NotFound();
        return todo;
    [HttpPost]
    public async Task<IActionResult> CreateToDoAsync(ToDo todo)
        await _toDoService.AddToDoAsync(todo);
        return CreatedAtAction(nameof(GetToDoById), new { id = todo.Id }, todo);
    [HttpPut("{id}")]
    public async Task<IActionResult> UpdateToDoByIdAsync(int id, ToDo todo)
        await _toDoService.UpdateToDoByIdAsync(id, todo);
        return NoContent();
    [HttpDelete("{id}")]
    public async Task<IActionResult> DeleteToDoByIdAsync(int id)
        await _toDoService.RemoveToDoByIdAsync(id);
        return NoContent();
}

// In Startup.cs file, add the following code to ConfigureServices method
services.AddScoped<ToDoService>();

CopilotChat 初体验
在这篇文章中，我们将一起学习如何使用 Microsoft 的 AI 编程助手，GitHub Copilot 来生成 C# 代码。同时，我们将使用一个 To-Do 应用来展示 Copilot 的功能。
注册 Copilot
要使用 GitHub Copilot，你需要注册并安装 GitHub Copilot 扩展。在安装时，你需要登录你的 GitHub 帐户和选择你喜欢的语言。
我们将使用 Entity Framework Core 和 ASP.NET Core 创建 To-Do 应用程序。以下是创建应用程序的基本步骤。
步骤 1：创建数据库上下文
我们首先需要创建数据上下文。我们创建一个名为 TodoContext 的类，在其中我们将 ToDo 实体框架创建为数据库表。同时还将添加一个连接字符串以及一些模型构建代码。
using Microsoft.EntityFrameworkCore;
namespace CopilotChatPreview
    public class TodoContext : DbContext
        public TodoContext(DbContextOptions<TodoContext> options) : base(options) {}
        public DbSet<ToDo> ToDos { get; set; }
        protected override void OnModelCreating(ModelBuilder modelBuilder)
            modelBuilder.Entity<ToDo>().HasData(
                new ToDo
                    Id = 1,
                    Task = "Learn AI programming",
                    Completed = false
                new ToDo
                    Id = 2,
                    Task = "Build a chatbot",
                    Completed = false
步骤 2：创建服务类
我们创建一个 ToDoService 类，用于在数据库中执行增删改查操作。
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
public class ToDoService
    private readonly TodoContext _context;
    public ToDoService(TodoContext context)
        _context = context;
    public async Task RemoveToDoByIdAsync(int id)
        var existingTodo = await _context.ToDos.FindAsync(id);
        if (existingTodo != null)
            _context.ToDos.Remove(existingTodo);
            await _context.SaveChangesAsync();
步骤 3：创建 To-Do 控制器
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
[ApiController]
[Route("[controller]")]
public class ToDoController : ControllerBase
    private readonly ToDoService _toDoService;
    public ToDoController(ToDoService toDoService)
        _toDoService = toDoService;
    [HttpDelete("{id}")]
    public async Task<IActionResult> DeleteToDoByIdAsync(int id)
        await _toDoService.RemoveToDoByIdAsync(id);
        return NoContent();
步骤 4：注册服务
在 ConfigureServices 方法中，我们需要将数据库上下文和服务类注册到容器中。
public void ConfigureServices(IServiceCollection services)
    services.AddDbContextPool<TodoContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

Github Copilot Chat 初体验

Github Copilot Chat 初体验

安装插件

使用

对话/问答

对代码进行解释

使用 Copilot Chat 一步步生成一个 To-do List 的 webapi 项目