abp学习日志九（总结）

AutoMaper

abp支持从Service映射到API，在Service 中有一个CurdAppService的泛型类，泛型类用到了几个参数
代码如下
（举例代码）

/*SystemApp：集合跟（实体）
*SystemAppDto：查询结果dto
*Guid：Key
*PagedAndSortedResultRequestDto：abp给的默认分页排序查询RequestDto
*CreateSystemAppDto：创建对象的Dto
*UpdateSystemAppDto：更新对象的Dto
*/
 public class SystemAppService : CrudAppService<SystemApp, SystemAppDto, Guid, PagedAndSortedResultRequestDto, CreateSystemAppDto, UpdateSystemAppDto>, ISystemAppService
    {
        private readonly IRepository<SystemApp, Guid> productRepository;
        private readonly ICurrentTenant currentTenant;
        public SystemAppService(IRepository<SystemApp, Guid> productRepository, ICurrentTenant currentTenant) : base(productRepository)
        {
            this.productRepository = productRepository;
            this.currentTenant = currentTenant;
        }
    }

看到上面的代码有那么多Dto，dto和聚合根（实体）是如何实现属性对应的呢？Abp使用的是AutoMap。
使用方法就是在项目中（Application项目）有一个XXXXAutoMapperProfile.cs的文件，直接在这里面写上
CreateMap<SystemApp,SystemAppDto>()
如果需要更多那就都写上。

官方文档也是这样说的。

坑1

如果你的项目使用的是Module模板，并且是2.2.1以上的版本，请注意，不能使用默认的，除非你的Dto和实体的属性丝毫不差，否则会出现异常。

• 请添加参数 MemberList.None。关于MemberList枚举类型有三个值，有兴趣可以都试试

坑2（这个不算坑）

如果项目存在很多个Dto和实体，那么写Create会写到怀疑人生。可以试试反射，反射的前提是做好namespace，否则反射的方法写起来比较麻烦，我的namespace规则，Dto都在XXXx.Dto命名空间。我的聚合根都在XXX.Model命名空间。

 public VShopApplicationAutoMapperProfile()
        {
            /* You can configure your AutoMapper mapping configuration here.
             * Alternatively, you can split your mapping configurations
             * into multiple profile classes for a better organization. */
            var types = Assembly.Load("xxxr.xxx.Application.Contracts").GetTypes();
            var domainTypes = Assembly.Load("xxx.xxx.Domain").GetTypes();
            foreach (var type in types)
            {
                if (type.Namespace == "xxx.xxx.Dto")
                {
                    if (type.Name.StartsWith("Create") || type.Name.StartsWith("Update"))
                    {
                        var domainTypeName = type.Name.Replace("Create", "").Replace("Update", "").Replace("Dto", "");
                        if (domainTypes.Any(t => t.Name == domainTypeName))
                            CreateMap(type, domainTypes.First(t => t.Name == domainTypeName), MemberList.None);
                    }
                    else
                    {
                        var domainTypeName = type.Name.Replace("Dto", "");
                        if (domainTypes.Any(t => t.Name == domainTypeName))
                            CreateMap(domainTypes.First(t => t.Name == domainTypeName), type, MemberList.None);
                    }
                }
            }
        }

Application

为什么会定位到这个项目呢，因为错误是发生在Service里面的。错误内容如下

2020-03-29 11:25:38.867 +08:00 [ERR] {
  "code": null,
  "message": "对不起,在处理你的请求期间,产生了一个服务器内部错误!",
  "details": null,
  "validationErrors": null
}
2020-03-29 11:25:38.868 +08:00 [ERR] An exception was thrown while activating Castle.Proxies.SystemRoleServiceProxy.
Autofac.Core.DependencyResolutionException: An exception was thrown while activating Castle.Proxies.SystemRoleServiceProxy.
 ---> Autofac.Core.DependencyResolutionException: None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'Castle.Proxies.SystemRoleServiceProxy' can be invoked with the available services and parameters:
Cannot resolve parameter 'Volo.Abp.Domain.Repositories.IRepository`2[Sugar.VShop.Model.SystemRole,System.Guid] productRepository' of constructor 'Void .ctor(Castle.DynamicProxy.IInterceptor[], Volo.Abp.Domain.Repositories.IRepository`2[Sugar.VShop.Model.SystemRole,System.Guid], Volo.Abp.MultiTenancy.ICurrentTenant)'.
   at Autofac.Core.Activators.Reflection.ReflectionActivator.GetValidConstructorBindings(IComponentContext context, IEnumerable`1 parameters)
   at Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters)
   at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters, Object& decoratorTarget)
   --- End of inner exception stack trace ---
   at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters, Object& decoratorTarget)
   at Autofac.Core.Resolving.InstanceLookup.Execute()
   at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Resolving.ResolveOperation.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance)
   at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve(IComponentContext context, Type serviceType)
   at Autofac.Extensions.DependencyInjection.AutofacServiceProvider.GetRequiredService(Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.AspNetCore.Mvc.Controllers.ServiceBasedControllerActivator.Create(ControllerContext actionContext)
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextExceptionFilterAsync>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

大致的意思就是无法反射出对应的构造函数。

网上找到了一个文章很有启发意义 https://www.codetd.com/article/7994226

这个文章的意思是说没有做DbSet 导致实体无法映射，也就是说聚合根对应的仓储无法反射，这个倒是挺符合道理的。

但是同样的代码放到 有UI的项目下可用，放到–no-ui的项目下不可用。

坑1

填坑。
需要在EntityFramework项目中添加如下代码

namespace Sugar.VShop.EntityFrameworkCore
{
    [DependsOn(
        typeof(VShopDomainModule),
        typeof(AbpEntityFrameworkCoreModule)
    )]
    public class VShopEntityFrameworkCoreModule : AbpModule
    {
        public override void ConfigureServices(ServiceConfigurationContext context)
        {
            context.Services.AddAbpDbContext<VShopDbContext>(options =>
            {
                //这里是需要添加的代码
                options.AddDefaultRepositories();
                /* Add custom repositories here. Example:
                 * options.AddRepository<Question, EfCoreQuestionRepository>();
                 */
            });
        }

        public override void OnApplicationInitialization(ApplicationInitializationContext context)
        {
            base.OnApplicationInitialization(context);
        }
    }
}

因为abp的模板文件就是添加到这里的，但是这个不合理，所以我把这段代码添加到了启动项目下。

坑2

不要让Service中包含App或者Application等关键字，比如有个服务叫SystemAppService，映射到API后会没有APP关键字，直接变成了XXX/System/{1}

https://www.codetd.com/article/7994226