Question

我正在使用Db Context构建自托管的WebAPI 2 OData 4服务，该服务从现有数据库进行反向工程。上下文如下所示：

using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using CommonDataService.Models.Mapping;

namespace CommonDataService.Models
{
    public partial class MALContext : DbContext
    {
        static MALContext()
        {
            Database.SetInitializer<MALContext>(null);
        }

        public MALContext()
            : base("Name=MALContext")
        {
        }

        public DbSet<AccountAlia> AccountAlias { get; set; }
        public DbSet<AccountProgram> AccountPrograms { get; set; }
        public DbSet<AccountRolePerson> AccountRolePersons { get; set; }
        public DbSet<Account> Accounts { get; set; }
        public DbSet<ChangeMeasure> ChangeMeasures { get; set; }
        public DbSet<Country> Countries { get; set; }
        public DbSet<Industry> Industries { get; set; }
        public DbSet<Offering> Offerings { get; set; }
        public DbSet<Person> People { get; set; }
        public DbSet<Program> Programs { get; set; }
        public DbSet<RegionAlia> RegionAlias { get; set; }
        public DbSet<Region> Regions { get; set; }
        public DbSet<Role> Roles { get; set; }
        public DbSet<Service> Services { get; set; }
        public DbSet<Tool> Tools { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new AccountAliaMap());
            modelBuilder.Configurations.Add(new AccountProgramMap());
            modelBuilder.Configurations.Add(new AccountRolePersonMap());
            modelBuilder.Configurations.Add(new AccountMap());
            modelBuilder.Configurations.Add(new ChangeMeasureMap());
            modelBuilder.Configurations.Add(new CountryMap());
            modelBuilder.Configurations.Add(new IndustryMap());
            modelBuilder.Configurations.Add(new OfferingMap());
            modelBuilder.Configurations.Add(new PersonMap());
            modelBuilder.Configurations.Add(new ProgramMap());
            modelBuilder.Configurations.Add(new RegionAliaMap());
            modelBuilder.Configurations.Add(new RegionMap());
            modelBuilder.Configurations.Add(new RoleMap());
            modelBuilder.Configurations.Add(new ServiceMap());
            modelBuilder.Configurations.Add(new ToolMap());
        }
    }
}

在我的startup.cs类中，我按以下方式配置我的ODataModelBuilder：

ODataModelBuilder builder = new ODataConventionModelBuilder();
            builder.EntitySet<ChangeMeasure>("ChangeMeasure");
            builder.EntitySet<Account>("Account");
            config.MapODataServiceRoute(
                routeName: "ODataRoute",
                routePrefix: null,
                model: builder.GetEdmModel());

我的一个模特课＆＃34; AccountAlia＆＃34;看起来像这样：

using System;
using System.Collections.Generic;

namespace CommonDataService.Models
{
    public partial class AccountAlia
    {
        public int AccountAlilasID { get; set; }
        public string AliasName { get; set; }
        public string SourceSystem { get; set; }
        public string SourceColumn { get; set; }
        public string SourceValue { get; set; }
        public Nullable<int> Account_ID { get; set; }
        public virtual Account Account { get; set; }
    }
}

当我尝试运行程序时，出现以下错误：

An exception of type 'System.InvalidOperationException' 
occurred in System.Web.OData.dll but was not handled in user code

Additional information: The complex type 'CommonDataService.Models.AccountAlia' 
refers to the entity type 'CommonDataService.Models.Account' 
through the property 'Account'.

对我来说，避免此类冲突的正确方法是什么？

Answer 1

错误消息提供了线索：复杂类型'X'指的是实体类型'Y'。目前，OData for Web API does not support references to entity types from within complex types。请参阅The complex type 'MyData.AssetReading' refers to the entity type 'MyData.Asset' through the property 'Asset'。

但我认为你希望AccountAlia成为实体类型。有一个拼写错误阻止ODataConventionModelBuilder识别AccountAlia的关键属性。只需将属性AccountAlilasID重命名为AccountAliaID，基于约定的模型构建器就会将AccountAlia识别为实体类型。

如何正确配置ODataModelBuilder以避免与模型对象的虚拟属性冲突

1 个答案: