新建一個Asp.net Core 2.0 WebAPI項目。

添加EntityFrameworkCore引用

建立Data，Models文件夾

Models內建立User.cs

namespace User.API.Models {public class User{public int Id { get; set; }public string Name { get; set; }public string Company { get; set; }public string Title { get; set; }} }

Data內建立UserContext.cs，繼承自DBContext

namespace User.API.Data {public class UserContext : DbContext{// 傳一個構造函數// base調用構造函數public UserContext(DbContextOptions<UserContext> options) : base(options){}protected override void OnModelCreating(ModelBuilder modelBuilder){// 重寫方法，AppUser生成UsersmodelBuilder.Entity<AppUser>().ToTable("Users").HasKey(u => u.Id);base.OnModelCreating(modelBuilder);}public DbSet<AppUser> Users { get; set; }} }

appsettings.json添加連接字符串

{"Logging": {"IncludeScopes": false,"Debug": {"LogLevel": {"Default": "Warning"}},"Console": {"LogLevel": {"Default": "Warning"}}},"ConnectionStrings": {"MySqlUser": "server=127.0.0.1;port=3306;database=fieer_mysql;userid=fieer;password=fieer"} }

Startup.cs內添加服務，生成默認數據

namespace User.API {public class Startup{public Startup(IConfiguration configuration){Configuration = configuration;}public IConfiguration Configuration { get; }public void ConfigureServices(IServiceCollection services){// 添加services.AddDbContext<UserContext>(options =>{options.UseMySQL(Configuration.GetConnectionString("MySqlUser"));});services.AddMvc();}public void Configure(IApplicationBuilder app, IHostingEnvironment env){if (env.IsDevelopment()){app.UseDeveloperExceptionPage();}app.UseMvc();InitUserDatabase(app);}// 添加默認用戶public void InitUserDatabase(IApplicationBuilder applicationBuilder){// 依賴注入using (var scope = applicationBuilder.ApplicationServices.CreateScope()){var userContext = scope.ServiceProvider.GetRequiredService<UserContext>();if (!userContext.Users.Any()){userContext.Users.Add(new Models.AppUser { Name = "fieer" });userContext.SaveChanges();}}}} }

暫時注釋掉InitUserDatabase(app);

程序包管理控制臺，添加Migration

$ Add-Migration init

生成文件

更新數據庫

$ Update-database

取消備注，運行程序

編輯ValuesController.cs

namespace User.API.Controllers
{
??? [Route("api/[controller]")]
??? public class ValuesController : Controller
??? {
??????? private UserContext _userContext;

??????? // 依賴注入
??????? public ValuesController(UserContext userContext)
??????? {
??????????? _userContext = userContext;
??????? }

??????? // GET api/values
??????? [HttpGet]
??????? public async Task<IActionResult> Get()
??????? {
??????????? return Json(await _userContext.Users.SingleOrDefaultAsync(u => u.Name == "fieer"));
??????? }
??? }
}

運行程序

轉載于:https://www.cnblogs.com/liumuu/p/8503636.html

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