使用Apworks开发基于CQRS架构的应用程序（六）：创建.NET WCF服务

在本节，我们将介绍.NET WCF服务的创建过程。

1. 在Solution Explorer中，右键单击TinyLibraryCQRS，然后选择Add | New Project…菜单，这将打开Add New Project对话框
2. 在Installed Templates 选项卡下，选择Visual C# | WCF，然后选择WCF Service Application，确保所选.NET版本为.NET Framework 4，在Name文本框中输入TinyLibrary.Services，然后单击OK按钮
3. 右键单击TinyLibrary.Services的References节点，然后选择Add Reference…菜单，这将打开Add Reference对话框
4. 在.NET选项卡下，选择Apworks，Apworks.Bus.DirectBus以及Apworks.ObjectContainers.Unity，然后单击OK按钮
5. 右键单击TinyLibrary.Services的References节点，然后选择Add Reference…菜单，这将打开Add Reference对话框
6. 在Projects选项卡下，选择TinyLibrary.Events，TinyLibrary.EventHandlers，TinyLibrary.Commands，TinyLibrary.CommandHandlers，TinyLibrary.Domain以及TinyLibrary.QueryObjects，然后单击OK按钮
7. 将自动生成的Service1.svc文件删掉
8. 右键单击TinyLibrary.Services项目，然后单击Add | New Item…菜单，这将打开Add New Item对话框
9. 在Installed Templates选项卡下，选择Visual C# | Web，然后选择WCF Service，在Name文本框中，输入CommandService然后单击Add按钮
10. 编辑CommandService.svc.cs文件，输入如下代码
    

    using System;
    using Apworks;
    using Apworks.Bus;
    using Apworks.Generators;
    using TinyLibrary.Commands;
    
    namespace TinyLibrary.Services
    {
        public class CommandService : ICommandService
        {
            private readonly ICommandBus bus = ObjectContainer.Instance.GetService<ICommandBus>();
    
            public long CreateReader(string loginName, string name)
            {
                long id = (long)IdentityGenerator.Instance.Generate();
                RegisterReaderCommand command = new RegisterReaderCommand(id, loginName, name);
                bus.Publish(command);
                bus.Commit();
                return id;
            }
    
            public long CreateBook(string title, string publisher, DateTime pubDate, string isbn, int pages)
            {
                long id = (long)IdentityGenerator.Instance.Generate();
                CreateBookCommand createBookCommand = new CreateBookCommand(id,
                    title, publisher, pubDate, isbn, pages, false);
                bus.Publish(createBookCommand);
                bus.Commit();
                return id;
            }
    
            public void BorrowBook(long readerId, long bookId)
            {
                BorrowBookCommand borrowBookCommand = new BorrowBookCommand(readerId, bookId);
                bus.Publish(borrowBookCommand);
                bus.Commit();
            }
    
            public void ReturnBook(long readerId, long bookId)
            {
                ReturnBookCommand returnBookCommand = new ReturnBookCommand(readerId, bookId);
                bus.Publish(returnBookCommand);
                bus.Commit();
            }
        }
    }

11. 用上面相同的方法创建一个QueryService.svc，然后编辑QueryService.svc.cs文件，输入如下代码
    

    using System;
    using System.Collections.Generic;
    using Apworks;
    using Apworks.Queries.Storage;
    using Apworks.Storage;
    using TinyLibrary.QueryObjects;
    
    namespace TinyLibrary.Services
    {
        public class QueryService : IQueryService
        {
            private IQueryObjectStorage GetQueryStorage()
            {
                return ObjectContainer.Instance.GetService<IQueryObjectStorage>();
            }
    
            public BookObject GetBook(long id)
            {
                using (IQueryObjectStorage queryObjectStorage = this.GetQueryStorage())
                {
                    var pb = new PropertyBag();
                    pb.Add("AggregateRootId", id);
                    return queryObjectStorage.SelectFirstOnly<BookObject>(pb);
                }
            }
    
            public ReaderObject GetReader(long id)
            {
                using (IQueryObjectStorage queryObjectStorage = this.GetQueryStorage())
                {
                    var pb = new PropertyBag();
                    pb.Add("AggregateRootId", id);
                    return queryObjectStorage.SelectFirstOnly<ReaderObject>(pb);
                }
            }
    
            public ReaderObject GetReaderByLogin(string loginName)
            {
                using (IQueryObjectStorage queryObjectStorage = this.GetQueryStorage())
                {
                    var pb = new PropertyBag();
                    pb.Add("LoginName", loginName);
                    return queryObjectStorage.SelectFirstOnly<ReaderObject>(pb);
                }
            }
    
            public IEnumerable<BookObject> GetAllBooks()
            {
                using (IQueryObjectStorage queryObjectStorage = this.GetQueryStorage())
                {
                    return queryObjectStorage.Select<BookObject>();
                }
            }
    
            public IEnumerable<RegistrationObject> GetBookRegistrationHistory(long bookId)
            {
                using (IQueryObjectStorage qos = this.GetQueryStorage())
                {
                    PropertyBag pbCriteria = new PropertyBag();
                    pbCriteria.Add("BookAggregateRootId", bookId);
    
                    PropertyBag pbSort = new PropertyBag();
                    pbSort.AddSort<DateTime>("RegistrationDate");
                    return qos.Select<RegistrationObject>(pbCriteria, pbSort, Apworks.Storage.SortOrder.Descending);
                }
            }
    
    
            public IEnumerable<RegistrationObject> GetReaderRegistrationHistory(long readerId)
            {
                using (IQueryObjectStorage qos = this.GetQueryStorage())
                {
                    PropertyBag pbCriteria = new PropertyBag();
                    pbCriteria.Add("ReaderAggregateRootId", readerId);
    
                    PropertyBag pbSort = new PropertyBag();
                    pbSort.AddSort<DateTime>("RegistrationDate");
                    return qos.Select<RegistrationObject>(pbCriteria, pbSort, Apworks.Storage.SortOrder.Descending);
                }
            }
        }
    }

12. 右键单击TinyLibrary.Services项目，然后选择Add | New Item…菜单，这将打开Add New Item对话框
13. 在Installed Templates选项卡下，选择Visual C# | Web，然后选择Global Application Class，然后单击Add按钮
14. 修改Global.asax.cs文件如下
    

    using System;
    using Apworks.Application;
    
    namespace TinyLibrary.Services
    {
        public class Global : System.Web.HttpApplication
        {
            private readonly IBootStrapper bootStrapper = BootStrapperFactory.Create();
    
            protected void Application_Start(object sender, EventArgs e)
            {
                bootStrapper.BootStrap();
            }
    
            // ... other methods omitted here.
        }
    }

Global.asax文件中定义了，当应用程序启动时，同时会启动Apworks系统。首先，Apworks.Application.BootStrapperFactory类创建了启动实例，然后使用BootStrap方法来初始化应用程序。这个过程是在Apworks的配置文件中定义的，将在后续文章中讨论。