ABP(现代ASP.NET样板开发框架)系列之二、ABP入门教程详解

public class Task : Entity
{
 [ForeignKey("AssignedPersonId")]
 public virtual Person AssignedPerson { get; set; }

 public virtual int? AssignedPersonId { get; set; }

 public virtual string Description { get; set; }

 public virtual DateTime CreationTime { get; set; }

 public virtual TaskState State { get; set; }

 public Task()
 {
  CreationTime = DateTime.Now;
  State = TaskState.Active;
 }
}

public class Person : Entity
{
 public virtual string Name { get; set; }
}

public class SimpleTaskSystemDbContext : AbpDbContext
{
 public virtual IDbSet Tasks { get; set; }

 public virtual IDbSet People { get; set; }

 public SimpleTaskSystemDbContext()
  : base("Default")
 {

 }

 public SimpleTaskSystemDbContext(string nameOrConnectionString)
  : base(nameOrConnectionString)
 {
   
 }
}

internal sealed class Configuration : DbMigrationsConfiguration
{
 public Configuration()
 {
  AutomaticMigrationsEnabled = false;
 }

 protected override void Seed(SimpleTaskSystem.EntityFramework.SimpleTaskSystemDbContext context)
 {
  context.People.AddOrUpdate(
   p => p.Name,
   new Person {Name = "Isaac Asimov"},
   new Person {Name = "Thomas More"},
   new Person {Name = "George Orwell"},
   new Person {Name = "Douglas Adams"}
   );
 }
}

public partial class InitialCreate : DbMigration
{
 public override void Up()
 {
  CreateTable(
   "dbo.StsPeople",
   c => new
    {
     Id = c.Int(nullable: false, identity: true),
     Name = c.String(),
    })
   .PrimaryKey(t => t.Id);
   
  CreateTable(
   "dbo.StsTasks",
   c => new
    {
     Id = c.Long(nullable: false, identity: true),
     AssignedPersonId = c.Int(),
     Description = c.String(),
     CreationTime = c.DateTime(nullable: false),
     State = c.Byte(nullable: false),
    })
   .PrimaryKey(t => t.Id)
   .ForeignKey("dbo.StsPeople", t => t.AssignedPersonId)
   .Index(t => t.AssignedPersonId);   
 }
  
 public override void Down()
 {
  DropForeignKey("dbo.StsTasks", "AssignedPersonId", "dbo.StsPeople");
  DropIndex("dbo.StsTasks", new[] { "AssignedPersonId" });
  DropTable("dbo.StsTasks");
  DropTable("dbo.StsPeople");
 }
}

PM> Update-Database

public interface ITaskRepository : IRepository
{

public class TaskRepository : SimpleTaskSystemRepositoryBase, ITaskRepository
{
  public List GetAllWithPeople(int? assignedPersonId, TaskState? state)
  {
    //在仓储方法中，不用处理数据库连接、DbContext和数据事务，ABP框架会自动处理。
      
    var query = GetAll(); //GetAll() 返回一个 IQueryable接口类型
      
    //添加一些Where条件

    if (assignedPersonId.HasValue)
    {
      query = query.Where(task => task.AssignedPerson.Id == assignedPersonId.Value);
    }

    if (state.HasValue)
    {
      query = query.Where(task => task.State == state);
    }

    return query
      .OrderByDescending(task => task.CreationTime)
      .Include(task => task.AssignedPerson)
      .ToList();
  }
}

public interface ITaskAppService : IApplicationService
{
  GetTasksOutput GetTasks(GetTasksInput input);
  void UpdateTask(UpdateTaskInput input);
  void CreateTask(CreateTaskInput input);
}

public class TaskAppService : ApplicationService, ITaskAppService
{
  private readonly ITaskRepository _taskRepository;
  private readonly IRepository _personRepository;
    
  /// 

  /// 构造函数自动注入我们所需要的类或接口
  /// 
  public TaskAppService(ITaskRepository taskRepository, IRepository personRepository)
  {
    _taskRepository = taskRepository;
    _personRepository = personRepository;
  }
    
  public GetTasksOutput GetTasks(GetTasksInput input)
  {
    //调用Task仓储的特定方法GetAllWithPeople
    var tasks = _taskRepository.GetAllWithPeople(input.AssignedPersonId, input.State);

    //用AutoMapper自动将List转换成List
    return new GetTasksOutput
        {
          Tasks = Mapper.Map>(tasks)
        };
  }
    
  public void UpdateTask(UpdateTaskInput input)
  {
    //可以直接Logger,它在ApplicationService基类中定义的
    Logger.Info("Updating a task for input: " + input);

    //通过仓储基类的通用方法Get，获取指定Id的Task实体对象
    var task = _taskRepository.Get(input.TaskId);

    //修改task实体的属性值
    if (input.State.HasValue)
    {
      task.State = input.State.Value;
    }

    if (input.AssignedPersonId.HasValue)
    {
      task.AssignedPerson = _personRepository.Load(input.AssignedPersonId.Value);
    }

    //我们都不需要调用Update方法
    //因为应用服务层的方法默认开启了工作单元模式（Unit of Work）
    //ABP框架会工作单元完成时自动保存对实体的所有更改，除非有异常抛出。有异常时会自动回滚，因为工作单元默认开启数据库事务。
  }

  public void CreateTask(CreateTaskInput input)
  {
    Logger.Info("Creating a task for input: " + input);

    //通过输入参数，创建一个新的Task实体
    var task = new Task { Description = input.Description };

    if (input.AssignedPersonId.HasValue)
    {
      task.AssignedPersonId = input.AssignedPersonId.Value;
    }

    //调用仓储基类的Insert方法把实体保存到数据库中
    _taskRepository.Insert(task);
  }
}

public class CreateTaskInput : IInputDto
{
  public int? AssignedPersonId { get; set; }

  [Required]
  public string Description { get; set; }
}

public class UpdateTaskInput : IInputDto, ICustomValidate
{
  [Range(1, long.MaxValue)]
  public long TaskId { get; set; }

  public int? AssignedPersonId { get; set; }

  public TaskState? State { get; set; }

  public void AddValidationErrors(List results)
  {
    if (AssignedPersonId == null && State == null)
    {
      results.Add(new ValidationResult("AssignedPersonId和State不能同时为空!", new[] { "AssignedPersonId", "State" }));
    }
  }
}

DynamicApiControllerBuilder
  .ForAll(Assembly.GetAssembly(typeof (SimpleTaskSystemApplicationModule)), "tasksystem")
  .Build();