领域Command

一、项目结构

二、代码

     /// <summary>
     ///
     /// </summary>
     public interface ICommand
     {
     }

     /// <summary>
     ///
     /// </summary>
     public interface ICommandResult
     {
         bool Success { get; }
         int? ReturnKey { get; }

         string ReturnKeys { get; }

     }

     /// <summary>
     ///
     /// </summary>
     /// <typeparam name="TCommand"></typeparam>
     public interface ICommandHandler<in TCommand> where TCommand : ICommand
     {
         ICommandResult Execute(TCommand command);
     }

     /// <summary>
     ///
     /// </summary>
     /// <typeparam name="TCommand"></typeparam>
     public interface IValidationHandler<in TCommand> where TCommand : ICommand
     {
         IEnumerable<ValidationResult> Validate(TCommand command);
     }

     /// <summary>
     ///
     /// </summary>
     public class CommandResult : ICommandResult
     {
         public CommandResult(bool success, int? returnkey = null, string returnKeys = null)
         {
             this.Success = success;
             this.ReturnKey = returnkey;
             this.ReturnKeys = returnKeys;
         }

         public bool Success { get; protected set; }

         public int? ReturnKey { get; protected set; }

         public string ReturnKeys { get; protected set; }

     }

     /// <summary>
     ///
     /// </summary>
     public class CommandHandlerNotFoundException : Exception
     {
         public CommandHandlerNotFoundException(Type type)
             : base(string.Format("Command handler not found for command type: {0}", type))
         {
         }
     }

     /// <summary>
     ///
     /// </summary>
     public class ValidationHandlerNotFoundException : Exception
     {
         public ValidationHandlerNotFoundException(Type type)
             : base(string.Format("Validation handler not found for command type: {0}", type))
         {
         }
     }

     /// <summary>
     ///
     /// </summary>
     public interface ICommandBus
     {
         ICommandResult Submit<TCommand>(TCommand command) where TCommand : ICommand;
         IEnumerable<ValidationResult> Validate<TCommand>(TCommand command) where TCommand : ICommand;
     }

     /// <summary>
     ///
     /// </summary>
     public class DefaultCommandBus : ICommandBus
     {
         public ICommandResult Submit<TCommand>(TCommand command) where TCommand : ICommand
         {
             var handler = (ICommandHandler<TCommand>)DependencyDefaultInstanceResolver.GetInstance(typeof(ICommandHandler<TCommand>));
             if (!((handler != null) && handler is ICommandHandler<TCommand>))
             {
                 throw new CommandHandlerNotFoundException(typeof(TCommand));
             }
             return handler.Execute(command);
         }

         public IEnumerable<ValidationResult> Validate<TCommand>(TCommand command) where TCommand : ICommand
         {
             var handler = (IValidationHandler<TCommand>)DependencyDefaultInstanceResolver.GetInstance(typeof(IValidationHandler<TCommand>));
             if (!((handler != null) && handler is IValidationHandler<TCommand>))
             {
                 throw new ValidationHandlerNotFoundException(typeof(TCommand));
             }
             return handler.Validate(command);
         }

     }

     /// <summary>
     /// Describes the result of a validation of a potential change through a business service.
     /// </summary>
     public class ValidationResult
     {

         /// <summary>
         /// Initializes a new instance of the <see cref="ValidationResult"/> class.
         /// </summary>
         public ValidationResult()
         {
         }

         /// <summary>
         /// Initializes a new instance of the <see cref="ValidationResult"/> class.
         /// </summary>
         /// <param name="memeberName">Name of the memeber.</param>
         /// <param name="message">The message.</param>
         public ValidationResult(string memeberName, string message)
         {
             this.MemberName = memeberName;
             this.Message = message;
         }

         /// <summary>
         /// Initializes a new instance of the <see cref="ValidationResult"/> class.
         /// </summary>
         /// <param name="message">The message.</param>
         public ValidationResult(string message)
         {
             this.Message = message;
         }

         /// <summary>
         /// Gets or sets the name of the member.
         /// </summary>
         /// <value>
         /// The name of the member.  May be null for general validation issues.
         /// </value>
         public string MemberName { get; set; }

         /// <summary>
         /// Gets or sets the message.
         /// </summary>
         /// <value>
         /// The message.
         /// </value>
         public string Message { get; set; }

     }

三、使用示例

注册

             builder.RegisterType<DefaultCommandBus>().As<ICommandBus>().InstancePerLifetimeScope();

             var domainCommands = Assembly.Load("Frozen.DomainCommands");
             builder.RegisterAssemblyTypes(domainCommands)
                 .AsClosedTypesOf(typeof(ICommandHandler<>)).InstancePerLifetimeScope();
             builder.RegisterAssemblyTypes(domainCommands)
                 .AsClosedTypesOf(typeof(IValidationHandler<>)).InstancePerLifetimeScope();

定义Command

     /// <summary>
     /// Command 删除学生
     /// </summary>
     public class DeleteStudentCommand : ICommand
     {
         /// <summary>
         /// 学生Id
         /// </summary>
         public int StuId { get; set; }

     }

定义Handler

     /// <summary>
     ///
     /// </summary>
     public class DeleteStudentHandler : ICommandHandler<DeleteStudentCommand>
     {
         private readonly IStuEducationRepo _iStuEducationRepo;

         public DeleteStudentHandler(IStuEducationRepo iStuEducationRepo)
         {
             this._iStuEducationRepo = iStuEducationRepo;
         }

         public ICommandResult Execute(DeleteStudentCommand command)
         {

             return new CommandResult(true);
         }

     }

调用

             var command = new DeleteStudentCommand()
             {
                 StuId =
             };
             var result = _commandBus.Submit(command);

结果：

附：源码下载