Outline
How about the next record my first time to build a .net core api, due to the relatively recent .net core fire, I also try to use the .net core did a small feature
This article includes
1. Environment Configuration
2. writing program
3. Deployment
The main reference: https:? //Docs.microsoft.com/zh-cn/aspnet/core/tutorials/first-web-api view = aspnetcore-3.1 & tabs = visual-studio
1, environment configuration
The first question you want to use .net core3.1 update VS, encountered during an update error
VS_InstallerShell.exe has an invalid certificate. Please ensure the appropriate Microsoft certificates are installed
Online tried many methods to no avail, and finally where (himself forgotten) to find a solution, install two windows patch, patch number and enclose Download
https://www.catalog.update.microsoft.com/Home.aspx
KB4474419
Kb4490628
2. writing program
After the latest vs installation, click New Project to create 3.1 .net core API project, create the future can be run directly, there will be an example of weather forecast
Use Nuget installation Microsoft.EntityFrameworkCore.SqlServr, ef although I have not used in the actual project before, but after another point to know, by the way try today
2.1 Create a database context classes
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Threading.Tasks; 5 using Microsoft.Data.SqlClient; 6 using Microsoft.EntityFrameworkCore; 7 8 namespace reportAPI 9 { 10 public class ChartDesignContenxt: DbContext 11 { 12 protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) 13 { 14 var sqlConnectionStringBuilder = new SqlConnectionStringBuilder 15 { 16 DataSource = "*.*.*.*", 17 InitialCatalog = "*", 18 UserID = "sa", 19 Password = "123456" 20 }; 21 optionsBuilder.UseSqlServer(sqlConnectionStringBuilder.ConnectionString); 22 23 base.OnConfiguring(optionsBuilder); 24 } 25 public DbSet<chartDesign> chartDesigns { get; set; } 26 } 27 }
Injection in 2.2 startup.cs context class database class, add cross-domain configuration
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Threading.Tasks; 5 using Microsoft.AspNetCore.Builder; 6 using Microsoft.AspNetCore.Hosting; 7 using Microsoft.AspNetCore.HttpsPolicy; 8 using Microsoft.AspNetCore.Mvc; 9 using Microsoft.Extensions.Configuration; 10 using Microsoft.Extensions.DependencyInjection; 11 using Microsoft.Extensions.Hosting; 12 using Microsoft.Extensions.Logging; 13 14 namespace reportAPI 15 { 16 public class Startup 17 { 18 public Startup(IConfiguration configuration) 19 { 20 Configuration = configuration; 21 } 22 23 public IConfiguration Configuration { get; } 24 25 // This method gets called by the runtime. Use this method to add services to the container. 26 public voidConfigureServices (IServiceCollection Services) 27 { 28 // allow one or more specific sources: 29 services.AddCors (Options => 30 { 31 is // configuring inter 32 options.AddPolicy ( " CORS " , Policy => 33 is { 34 is / / settings allow cross-domain sources, a plurality of words can be `` spaced 35 Policy 36 .AllowAnyOrigin () 37 [ .AllowAnyHeader () 38 is .AllowAnyMethod (); 39 }); 40 }); 41 42 services.AddScoped<IPMSDbContenxt>(_ => new IPMSDbContenxt()); 43 services.AddScoped<ChartDesignContenxt>(_ => new ChartDesignContenxt()); //注入数据库上下文类 44 45 services.AddControllers(); 46 } 47 48 // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. 49 public void Configure(IApplicationBuilder app, IWebHostEnvironment env) 50 { 51 if (env.IsDevelopment()) 52 { 53 app.UseDeveloperExceptionPage(); 54 } 55 56 app.UseHttpsRedirection(); 57 58 app.UseRouting(); 59 60 app.UseCors("cors"); //使用跨域 61 62 app.UseAuthorization(); 63 64 app.UseEndpoints(endpoints => 65 { 66 endpoints.MapControllers(); 67 }); 68 } 69 } 70 }
2.3 Creating a controller, a total of three methods for a list, update a record, get a record
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Threading.Tasks; 5 using Microsoft.AspNetCore.Http; 6 using Microsoft.AspNetCore.Mvc; 7 using Microsoft.EntityFrameworkCore; 8 9 namespace reportAPI.Controllers 10 { 11 [Route("api/[controller]/[action]")] 12 [ApiController] 13 public class ChartDesignController : ControllerBase 14 { 15 private readonly ChartDesignContenxt _context; 16 17 public ChartDesignController(ChartDesignContenxt context) 18 { 19 _context = context; 20 } 21 22 [HttpPost] 23 public IActionResult Save(CommonFilter filter) 24 { 25 try 26 { 27 //var temp = entity.data.ToString(); 28 chartDesign model = new chartDesign(); 29 model.designName = filter.field1; 30 model.designContent = filter.data.ToString(); 31 if (filter.key == -1) 32 { 33 _context.Add<chartDesign>(model); 34 } 35 else 36 { 37 model.designId = filter.key; 38 _context.Update<chartDesign>(model); 39 } 40 _context.SaveChanges(); 41 return Ok("保存成功"); 42 } 43 catch(Exception ex) 44 { 45 return Ok(ex.Message); 46 } 47 48 } 49 [HttpPost] 50 public IActionResult Get(CommonFilter filter) 51 { 52 try 53 { 54 chartDesign entity = _context.chartDesigns.Find(filter.key); 55 if (entity == null) 56 { 57 return NotFound(); 58 } 59 60 return Ok(entity); 61 } 62 catch(Exception ex) 63 { 64 return Ok(ex.Message); 65 } 66 } 67 [HttpPost] 68 public IActionResult GetList() 69 { 70 try 71 { 72 string sql = "select * from chartDesign"; 73 List<chartDesign> list = _context.chartDesigns.ToList(); //.FromSqlRaw(sql).ToList(); 74 return Ok(list); 75 } 76 catch (Exception ex) 77 { 78 return Ok(ex.Message); 79 } 80 } 81 } 82 }
A complete CRUD
3. deployed to the server
Deployment is simple, direct copy bin below, and then double-click the project name .exe service started up
