1、用VS2017创建如下图的几个.NET Standard类库，默认版本为1.4，你可以通过项目属性进行修改，最高支持到1.6，大概五月份左右会更新至2.0，API会翻倍，很期待！
排名分先后，这里简要说下我对各个类库职责的一个理解。
2、当然了，你还可以通过.NET Core Tool的cli命令来创建，前提是你的电脑上安装了.NET Core SDK。
dotnet new classlib -n Light.Repository //创建一个名字为Light.Repository的.NET Standard类库
更多创建类型请键入如下命令进行查看
dotnet new -all
红框内自上而下依次表示：
1、准备创建用户表的SQL脚本
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1 USE [Light] 2 GO 3 4 /****** Object: Table [dbo].[User] Script Date: 2017/3/27 22:40:08 ******/ 5 SET ANSI_NULLS ON 6 GO 7 8 SET QUOTED_IDENTIFIER ON 9 GO 10 11 CREATE TABLE [dbo].[User]( 12 [Id] [int] IDENTITY(10000,1) NOT NULL, 13 [UserName] [nvarchar](50) NOT NULL, 14 [Password] [nvarchar](50) NOT NULL, 15 [Gender] [bit] NOT NULL, 16 [Birthday] [datetime] NOT NULL, 17 [CreateUserId] [int] NOT NULL, 18 [CreateDate] [datetime] NOT NULL, 19 [UpdateUserId] [int] NOT NULL, 20 [UpdateDate] [datetime] NOT NULL, 21 [IsDeleted] [bit] NOT NULL, 22 CONSTRAINT [PK_User] PRIMARY KEY CLUSTERED 23 ( 24 [Id] ASC 25 )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] 26 ) ON [PRIMARY] 27 28 GO 29 30 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_UserName] DEFAULT ('') FOR [UserName] 31 GO 32 33 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_Password] DEFAULT ('') FOR [Password] 34 GO 35 36 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_Gender] DEFAULT ((0)) FOR [Gender] 37 GO 38 39 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_Birthday] DEFAULT (getdate()) FOR [Birthday] 40 GO 41 42 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_CreateUserId] DEFAULT ((0)) FOR [CreateUserId] 43 GO 44 45 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_CreateDate] DEFAULT (getdate()) FOR [CreateDate] 46 GO 47 48 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_UpdateUserId] DEFAULT ((0)) FOR [UpdateUserId] 49 GO 50 51 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_UpdateDate] DEFAULT (getdate()) FOR [UpdateDate] 52 GO 53 54 ALTER TABLE [dbo].[User] ADD CONSTRAINT [DF_User_IsDeleted] DEFAULT ((0)) FOR [IsDeleted] 55 GO 56 57 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'主键Id' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'Id' 58 GO 59 60 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'用户名' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'UserName' 61 GO 62 63 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'密码' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'Password' 64 GO 65 66 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'性别（0女，1男）' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'Gender' 67 GO 68 69 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'出生年月日' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'Birthday' 70 GO 71 72 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'创建人' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'CreateUserId' 73 GO 74 75 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'创建时间' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'CreateDate' 76 GO 77 78 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'更新人' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'UpdateUserId' 79 GO 80 81 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'更新时间' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'UpdateDate' 82 GO 83 84 EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'标志是否删除（0未删除，1已删除）' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'User', @level2type=N'COLUMN',@level2name=N'IsDeleted' 85 GOView Code
2、添加对应的User表实体
1 /// <summary> 2 /// 用户实体 3 /// </summary> 4 public class User : BaseModel 5 { 6 /// <summary> 7 /// 用户名 8 /// </summary> 9 public string UserName { get; set; } 10 11 /// <summary> 12 /// 密码 13 /// </summary> 14 public string Password { get; set; } 15 16 /// <summary> 17 /// 性别（0女，1男） 18 /// </summary> 19 public bool Gender { get; set; } 20 21 /// <summary> 22 /// 出生年月日 23 /// </summary> 24 public DateTime Birthday { get; set; } 25 }View Code
3、使用泛型针对每一个表定义基本的CRUD接口，然后IUserRepository继承它，如果需要其他的接口，后续往里边定义即可
1 /// <summary> 2 /// 基类业务接口定义 3 /// </summary> 4 public interface IBaseBusiness<T> where T : class 5 { 6 /// <summary> 7 /// 添加一个实体 8 /// </summary> 9 /// <param name="entity">要创建的实体</param> 10 /// <param name="connectionString">链接字符串</param> 11 /// <returns></returns> 12 bool CreateEntity(T entity, string connectionString = null); 13 14 /// <summary> 15 /// 根据主键Id获取一个实体 16 /// </summary> 17 /// <param name="id">主键Id</param> 18 /// <param name="connectionString">链接字符串</param> 19 /// <returns></returns> 20 T RetriveOneEntityById(int id, string connectionString = null); 21 22 /// <summary> 23 /// 获取所有实体 24 /// </summary> 25 /// <param name="connectionString">链接字符串</param> 26 /// <returns></returns> 27 IEnumerable<T> RetriveAllEntity(string connectionString = null); 28 29 /// <summary> 30 /// 修改一个实体 31 /// </summary> 32 /// <param name="entity">要修改的实体</param> 33 /// <param name="connectionString">链接字符串</param> 34 /// <returns></returns> 35 bool UpdateEntity(T entity, string connectionString = null); 36 37 /// <summary> 38 /// 根据主键Id删除一个实体 39 /// </summary> 40 /// <param name="id">主键Id</param> 41 /// <param name="connectionString">链接字符串</param> 42 /// <returns></returns> 43 bool DeleteEntityById(int id, string connectionString = null); 44 }View Code
4、主角进场。通过Nuget引入Dapper到Repository中，目前的版本为1.50.2
Install-Package Dapper
a)、设置你的链接字符串和DbConnection
1 /// <summary> 2 /// 数据库配置 3 /// </summary> 4 public class DataBaseConfig 5 { 6 #region SqlServer链接配置 7 /// <summary> 8 /// 默认的Sql Server的链接字符串 9 /// </summary> 10 private static string DefaultSqlConnectionString = @"Data Source=.;Initial Catalog=Light;User ID=sa;Password=sa;"; 11 public static IDbConnection GetSqlConnection(string sqlConnectionString = null) 12 { 13 if (string.IsNullOrWhiteSpace(sqlConnectionString)) 14 { 15 sqlConnectionString = DefaultSqlConnectionString; 16 } 17 IDbConnection conn = new SqlConnection(sqlConnectionString); 18 conn.Open(); 19 return conn; 20 } 21 #endregion 22 }
b)、实现IUserRepository定义的接口，使用Dapper进行操作数据
1 /// <summary> 2 /// 用户仓储 3 /// </summary> 4 /// <typeparam name="User"></typeparam> 5 public class UserRepository : IUserRepository 6 { 7 /// <summary> 8 /// 创建一个用户 9 /// </summary> 10 /// <param name="entity">用户</param> 11 /// <param name="connectionString">链接字符串</param> 12 /// <returns></returns> 13 public bool CreateEntity(User entity, string connectionString = null) 14 { 15 using (IDbConnection conn = DataBaseConfig.GetSqlConnection(connectionString)) 16 { 17 string insertSql = @"INSERT INTO [dbo].[User] 18 ([UserName] 19 ,[Password] 20 ,[Gender] 21 ,[Birthday] 22 ,[CreateUserId] 23 ,[CreateDate] 24 ,[UpdateUserId] 25 ,[UpdateDate] 26 ,[IsDeleted]) 27 VALUES 28 (@UserName 29 ,@Password 30 ,@Gender 31 ,@Birthday 32 ,@CreateUserId 33 ,@CreateDate 34 ,@UpdateUserId 35 ,@UpdateDate 36 ,@IsDeleted)"; 37 return conn.Execute(insertSql, entity) > 0; 38 } 39 } 40 41 /// <summary> 42 /// 根据主键Id删除一个用户 43 /// </summary> 44 /// <param name="id">主键Id</param> 45 /// <param name="connectionString">链接字符串</param> 46 /// <returns></returns> 47 public bool DeleteEntityById(int id, string connectionString = null) 48 { 49 using (IDbConnection conn = DataBaseConfig.GetSqlConnection(connectionString)) 50 { 51 string deleteSql = @"DELETE FROM [dbo].[User] 52 WHERE Id = @Id"; 53 return conn.Execute(deleteSql, new { Id = id }) > 0; 54 } 55 } 56 57 /// <summary> 58 /// 获取所有用户 59 /// </summary> 60 /// <param name="connectionString">链接字符串</param> 61 /// <returns></returns> 62 public IEnumerable<User> RetriveAllEntity(string connectionString = null) 63 { 64 using (IDbConnection conn = DataBaseConfig.GetSqlConnection(connectionString)) 65 { 66 string querySql = @"SELECT [Id] 67 ,[UserName] 68 ,[Password] 69 ,[Gender] 70 ,[Birthday] 71 ,[CreateUserId] 72 ,[CreateDate] 73 ,[UpdateUserId] 74 ,[UpdateDate] 75 ,[IsDeleted] 76 FROM [dbo].[User]"; 77 return conn.Query<User>(querySql); 78 } 79 } 80 81 /// <summary> 82 /// 根据主键Id获取一个用户 83 /// </summary> 84 /// <param name="id">主键Id</param> 85 /// <param name="connectionString">链接字符串</param> 86 /// <returns></returns> 87 public User RetriveOneEntityById(int id, string connectionString = null) 88 { 89 using (IDbConnection conn = DataBaseConfig.GetSqlConnection(connectionString)) 90 { 91 string querySql = @"SELECT [Id] 92 ,[UserName] 93 ,[Password] 94 ,[Gender] 95 ,[Birthday] 96 ,[CreateUserId] 97 ,[CreateDate] 98 ,[UpdateUserId] 99 ,[UpdateDate] 100 ,[IsDeleted] 101 FROM [dbo].[User] 102 WHERE Id = @Id"; 103 return conn.QueryFirstOrDefault<User>(querySql, new { Id = id }); 104 } 105 } 106 107 /// <summary> 108 /// 修改一个用户 109 /// </summary> 110 /// <param name="entity">要修改的用户</param> 111 /// <param name="connectionString">链接字符串</param> 112 /// <returns></returns> 113 public bool UpdateEntity(User entity, string connectionString = null) 114 { 115 using (IDbConnection conn = DataBaseConfig.GetSqlConnection(connectionString)) 116 { 117 string updateSql = @"UPDATE [dbo].[User] 118 SET [UserName] = @UserName 119 ,[Password] = @Password 120 ,[Gender] = @Gender 121 ,[Birthday] = @Birthday 122 ,[UpdateUserId] = @UpdateUserId 123 ,[UpdateDate] = @UpdateDate 124 ,[IsDeleted] = @IsDeleted 125 WHERE Id = @Id"; 126 return conn.Execute(updateSql, entity) > 0; 127 } 128 } 129 }
上面的代码所执行的方法Execute，Query，QueryFirstOrDefault其实都是IDbConnection的扩展方法，转到定义你也可以清楚的看到默认buffered缓存是开启的，并且都支持事务提交，同时还都对应各自的async异步方法
public static IEnumerable<T> Query<T>(this IDbConnection cnn, string sql, object param = null, IDbTransaction transaction = null, bool buffered = true, int? commandTimeout = default(int?), CommandType? commandType = default(CommandType?));
这样一来，再也不用DataReader去一个一个属性赋值了，也不用SqlParameter一个一个去参数化了，Dapper全部帮你做了，你只需要关注你的业务SQL语句以及上下文的对象即可，是不是很清爽！
c)、接下来就是完成对上一部分仓储数据的调用。一方面是IBusiness的服务接口定义，另一方面则是Business的简单实现，因为暂时只是涉及到一个表的增查改删，所以具体的代码就不上了
d)、至于依赖注入模块，我直接使用的是Microsoft.Extensions.DependencyInjection，所有的服务由ServiceCollection服务容器进行管理，我们只需要将接口和它的实现类进行注册就行了
1 /// <summary> 2 /// 注入业务逻辑层 3 /// </summary> 4 public class BusinessInjection 5 { 6 public static void ConfigureBusiness(IServiceCollection services) 7 { 8 services.AddSingleton<IUserBusiness, UserBusiness>(); 9 } 10 }
1 /// <summary> 2 /// 注入仓储层 3 /// </summary> 4 public class RepositoryInjection 5 { 6 public static void ConfigureRepository(IServiceCollection services) 7 { 8 services.AddSingleton<IUserRepository, UserRepository>(); 9 } 10 }
简介：SwaggerUI是一款针对WebApi的可视化工具，同样我也称它是一款全自动的接口描述文档，并且可以很方便的帮助你测试你的接口，接下来我们一步一步的来把它添加进去。
1、向ASP.NET Core WebApi项目中添加Swashbuckle组件，打开包管理控制台，输入：
Install-Package Swashbuckle -Pre
记得加上后边的-Pre，表示安装最新版本，否则的话会默认下载稳定版本5.5.3（不支持Core）
当然了，你也可以包管理器进行安装，记得勾选“包括预发行版”，然后选择6.0.0-beta902进行安装
2、打开Startup文件，添加Swagger中间件并将他们注入到应用程序的管道中，同时也将我们自定义的服务加进去
1 /// <summary> 2 /// This method gets called by the runtime. Use this method to add services to the container. 3 /// </summary> 4 /// <param name="services"></param> 5 public void ConfigureServices(IServiceCollection services) 6 { 7 RepositoryInjection.ConfigureRepository(services); 8 BusinessInjection.ConfigureBusiness(services); 9 services.AddMvc(); 10 services.AddSwaggerGen(); 11 } 12 13 /// <summary> 14 /// This method gets called by the runtime. Use this method to configure the HTTP request pipeline. 15 /// </summary> 16 /// <param name="app"></param> 17 /// <param name="env"></param> 18 /// <param name="loggerFactory"></param> 19 public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory) 20 { 21 loggerFactory.AddConsole(Configuration.GetSection("Logging")); 22 loggerFactory.AddDebug(); 23 24 app.UseMvc(); 25 app.UseSwagger(); 26 app.UseSwaggerUi(); 27 }
3、打开launchSettings文件，修改launchUrl为“swagger/ui”
1 "profiles": { 2 "IIS Express": { 3 "commandName": "IISExpress", 4 "launchBrowser": true, 5 "launchUrl": "swagger/ui", 6 "environmentVariables": { 7 "ASPNETCORE_ENVIRONMENT": "Development" 8 } 9 }, 10 "Light.Api": { 11 "commandName": "Project", 12 "launchBrowser": true, 13 "launchUrl": "swagger/ui", 14 "environmentVariables": { 15 "ASPNETCORE_ENVIRONMENT": "Development" 16 }, 17 "applicationUrl": "http://localhost:62116" 18 } 19 }
4、添加一个UserController，针对每一个服务增加一个REST风格的API接口。注意使用的HttpMethod方法。HttpGet表示获取对象，HttpPost表示创建对象，HttpPut表示修改对象，HttpDelete表示删除对象
1 /// <summary> 2 /// 用户控制器 3 /// </summary> 4 [Route("api/[controller]")] 5 public class UserController : Controller 6 { 7 private readonly IUserBusiness iUserBusiness; 8 /// <summary> 9 /// 构造函数注入服务 10 /// </summary> 11 /// <param name="userBusiness"></param> 12 public UserController(IUserBusiness userBusiness) 13 { 14 iUserBusiness = userBusiness; 15 } 16 17 /// <summary> 18 /// 获取所有用户 19 /// </summary> 20 /// <returns></returns> 21 [HttpGet] 22 //[Route("AllUser")] 23 public IEnumerable<User> GetAllUser() 24 { 25 return iUserBusiness.RetriveAllEntity(); 26 } 27 28 /// <summary> 29 /// 根据主键Id获取一个用户 30 /// </summary> 31 /// <param name="id">主键Id</param> 32 /// <returns></returns> 33 [HttpGet("{id}")] 34 public User GetOneUser(int id) 35 { 36 return iUserBusiness.RetriveOneEntityById(id); 37 } 38 39 /// <summary> 40 /// 新增用户 41 /// </summary> 42 /// <param name="user">用户实体</param> 43 /// <returns></returns> 44 [HttpPost] 45 public bool CreateUser([FromBody]User user) 46 { 47 return iUserBusiness.CreateEntity(user); 48 } 49 50 /// <summary> 51 /// 修改用户 52 /// </summary> 53 /// <param name="id">主键Id</param> 54 /// <param name="user">用户实体</param> 55 /// <returns></returns> 56 [HttpPut("{id}")] 57 public bool UpdateUser(int id, [FromBody]User user) 58 { 59 user.Id = id; 60 return iUserBusiness.UpdateEntity(user); 61 } 62 63 /// <summary> 64 /// 根据主键Id删除一个用户 65 /// </summary> 66 /// <param name="id">主键Id</param> 67 /// <returns></returns> 68 [HttpDelete("{id}")] 69 public bool DeleteUser(int id) 70 { 71 return iUserBusiness.DeleteEntityById(id); 72 } 73 }View Code
5、大功告成，Ctrl+F5运行你的程序，并试着执行添加，修改和查询的Api，体验Swagger带给你的方便之处。
写在最后：这篇文章只是介绍了它们俩最简单最基本的用法，如果其中说法有误的，还望各位前辈多多指点，更多的内容还需要后续的继续积累和学习，加油！
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