标签:开始 sch false member exception cep column 文件 typeof
在前两篇文章<Part I: Business Scenario> 和<Part II: Project Setup>后,可以开始真正Model的创建。
步骤如下:
1. 创建Models文件夹,并在该文件夹中加入一个数个Class。
Knowledge Category定义,代码如下:
using System; namespace knowledgebuilderapi.Models { public enum KnowledgeCategory: Int16 { Concept = 0, Formula = 1, } }
基类BaseModel,代码如下:
using System; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; namespace knowledgebuilderapi.Models { public abstract class BaseModel { [Column("CreatedAt")] public DateTime CreatedAt { get; set; } [Column("ModifiedAt")] public DateTime ModifiedAt { get; set; } } }
Knowledge的Model,代码如下:
using System; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema; namespace knowledgebuilderapi.Models { [Table("Knowledge")] public class Knowledge : BaseModel { [Key] public Int32 ID { get; set; } [Required] [Column("ContentType")] public KnowledgeCategory Category { get;set; } [Required] [MaxLength(50)] [ConcurrencyCheck] [Column("Title", TypeName = "NVARCHAR(50)")] public string Title { get;set; } [Required] [Column("Content")] public string Content { get;set; } [Column("Tags")] public string Tags { get; set; } } }
最后加入DataContext,代码如下:
using System; using Microsoft.EntityFrameworkCore; namespace knowledgebuilderapi.Models { public class kbdataContext : DbContext { public kbdataContext(DbContextOptions<kbdataContext> options) : base(options) { } public DbSet<Knowledge> Knowledges { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Knowledge>() .Property(b => b.CreatedAt) .HasDefaultValueSql("getdate()"); modelBuilder.Entity<Knowledge>() .Property(b => b.ModifiedAt) .HasDefaultValueSql("getdate()"); modelBuilder.Entity<Knowledge>() .Property(e => e.Category) .HasConversion( v => (Int16)v, v => (KnowledgeCategory)v); } } }
2. 如果Controller文件夹尚未创建,则创建一个,并在其中创建Knowledge的Controller
完整代码如下:
using System; using Microsoft.AspNet.OData; using Microsoft.EntityFrameworkCore; using knowledgebuilderapi.Models; using System.Linq; namespace knowledgebuilderapi.Controllers { public class KnowledgeController : ODataController { private readonly kbdataContext _context; public KnowledgeController(kbdataContext context) { _context = context; } [EnableQuery] public IQueryable<Knowledge> Get() { return _context.Knowledges; } } }
3. 修改Startup
using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Hosting; using Microsoft.AspNetCore.HttpsPolicy; using Microsoft.AspNetCore.Mvc; using Microsoft.Extensions.Configuration; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Logging; using Microsoft.Extensions.Options; using Microsoft.EntityFrameworkCore; using Microsoft.AspNet.OData.Extensions; using Microsoft.AspNet.OData.Builder; using Microsoft.AspNet.OData.Batch; using knowledgebuilderapi.Models; using Microsoft.AspNetCore.Routing; namespace knowledgebuilderapi { public class Startup { public Startup(IConfiguration configuration) { Configuration = configuration; } public IConfiguration Configuration { get; } public string ConnectionString { get; private set; } // This method gets called by the runtime. Use this method to add services to the container. public void ConfigureServices(IServiceCollection services) { this.ConnectionString = Configuration["KBAPI.ConnectionString"]; services.AddDbContext<kbdataContext>(options => options.UseSqlServer(this.ConnectionString)); services.AddMvc(action => { action.EnableEndpointRouting = false; }).SetCompatibilityVersion(CompatibilityVersion.Version_2_2); services.AddOData(); } // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. public void Configure(IApplicationBuilder app, IHostingEnvironment env) { if (env.IsDevelopment()) { app.UseDeveloperExceptionPage(); } else { // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts. app.UseHsts(); } app.UseHttpsRedirection(); ODataModelBuilder modelBuilder = new ODataConventionModelBuilder(app.ApplicationServices); modelBuilder.EntitySet<Knowledge>("Knowledges"); modelBuilder.Namespace = typeof(Knowledge).Namespace; var model = modelBuilder.GetEdmModel(); app.UseODataBatching(); app.UseMvc(routeBuilder => { // and this line to enable OData query option, for example $filter routeBuilder.Select().Expand().Filter().OrderBy().MaxTop(100).Count(); routeBuilder.MapODataServiceRoute("ODataRoute", "odata", model); }); } } }
4. 在项目的根目录下执行
cd knowledgebuilderapi
dotnet run
5. 这时,打开浏览器,访问 http://localhost:5000/odata/$metadata
会成功拿到一下文件:
<edmx:Edmx xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx" Version="4.0"> <edmx:DataServices> <Schema xmlns="http://docs.oasis-open.org/odata/ns/edm" Namespace="knowledgebuilderapi.Models"> <EntityType Name="Knowledge"> <Key> <PropertyRef Name="ID"/> </Key> <Property Name="ID" Type="Edm.Int32" Nullable="false"/> <Property Name="Category" Type="knowledgebuilderapi.Models.KnowledgeCategory" Nullable="false"/> <Property Name="Title" Type="Edm.String" Nullable="false" MaxLength="50"/> <Property Name="Content" Type="Edm.String" Nullable="false"/> <Property Name="Tags" Type="Edm.String"/> <Property Name="CreatedAt" Type="Edm.DateTimeOffset" Nullable="false"/> <Property Name="ModifiedAt" Type="Edm.DateTimeOffset" Nullable="false"/> </EntityType> <EnumType Name="KnowledgeCategory" UnderlyingType="Edm.Int16"> <Member Name="Concept" Value="0"/> <Member Name="Formula" Value="1"/> </EnumType> <EntityContainer Name="Container"> <EntitySet Name="Knowledges" EntityType="knowledgebuilderapi.Models.Knowledge"> <Annotation Term="Org.OData.Core.V1.OptimisticConcurrency"> <Collection> <PropertyPath>Title</PropertyPath> </Collection> </Annotation> </EntitySet> </EntityContainer> </Schema> </edmx:DataServices> </edmx:Edmx>
创建基于OData的Web API - Knowledge Builder API, Part III:Write Model
标签:开始 sch false member exception cep column 文件 typeof
原文地址:https://www.cnblogs.com/alvachien/p/11809136.html