ODATA WEB API（二）----ODATA服务与客户端

一、概述

ODATA不经可以作为WebAPI建立相应的WEBAPI控制器，还可以建立ODataControl控制器，能够通过插件建立第三方ODataClinet类库；调用和使用数据变得简单可行。

二、建立OData Web API 服务端

1、通过NuGet添加第三方Microsoft.AspNet.OData；

2、建立相应的Model：Person和Trip

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace MyMVCODataTwo.Models
{
    public class Person
    {
        [Key]
        public String ID { get; set; }
        [Required]
        public String Name { get; set; }
        public String Description { get; set; }
        public List<Trip> Trips { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
namespace MyMVCODataTwo.Models
{
    public class Trip
    {
        [Key]
        public String ID { get; set; }
        [Required]
        public String Name { get; set; }
    }
}

3、添加程序集合，代替数据库请求：

using MyMVCODataTwo.Models;
using System.Collections.Generic;
namespace MyMVCODataTwo.DataSource
{
    public class DemoDataSources
    {
        private static DemoDataSources instance = null;
        public static DemoDataSources Instance
        {
            get
            {
                if (instance == null)
                {
                    instance = new DemoDataSources();
                }
                return instance;
            }
        }
        public List<Person> People { get; set; }
        public List<Trip> Trips { get; set; }
        private DemoDataSources()
        {
            this.Reset();
            this.Initialize();
        }
        public void Reset()
        {
            this.People = new List<Person>();
            this.Trips = new List<Trip>();
        }
        public void Initialize()
        {
            this.Trips.AddRange(new List<Trip>()
            {
                new Trip()
                {
                    ID = "",
                    Name = "Trip 0"
                },
                new Trip()
                {
                    ID = "",
                    Name = "Trip 1"
                },
                new Trip()
                {
                    ID = "",
                    Name = "Trip 2"
                },
                new Trip()
                {
                    ID = "",
                    Name = "Trip 3"
                }
            });
            this.People.AddRange(new List<Person>
            {
                new Person()
                {
                    ID = "",
                    Name = "Angel",
                    Trips = new List<Trip>{Trips[], Trips[]}
                },
                new Person()
                {
                    ID = "",
                    Name = "Clyde",
                    Description = "Contrary to popular belief, Lorem Ipsum is not simply random text.",
                    Trips = new List<Trip>{Trips[], Trips[]}
                },
                new Person()
                {
                    ID = "",
                    Name = "Elaine",
                    Description = "It has roots in a piece of classical Latin literature from 45 BC, making Lorems over 2000 years old."
                }
            });
        }
    }
}

4、WebApi配置：

public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            config.MapODataServiceRoute("odata", null, GetEdmModel(), new DefaultODataBatchHandler(GlobalConfiguration.DefaultServer));
            config.EnsureInitialized();
        }
        private static IEdmModel GetEdmModel()
        {
            ODataConventionModelBuilder builder = new ODataConventionModelBuilder();
            builder.Namespace = "Demos";
            builder.ContainerName = "DefaultContainer";
            builder.EntitySet<Person>("People");
            builder.EntitySet<Trip>("Trips");
            var edmModel = builder.GetEdmModel();
            return edmModel;
        }
    }

参考博客：

http://www.odata.org/blog/how-to-use-web-api-odata-to-build-an-odata-v4-service-without-entity-framework/

三、建立独立的控制台客户端：

1、通过扩展工具管理，下载OData Client Code ；

2、添加控制台引用程序，添加OData Client Item；

修改MetadataDocumentUri 地址： public const string MetadataDocumentUri = "http://localhost:8090";

3、编写应用端代码：

 static void Main(string[] args)
        {
            // TODO: Replace with your local URI.
            string serviceUri = "http://localhost:8090/";
            var container = new DefaultContainer(new Uri(serviceUri));

            foreach (var p in container.People)
            {
                Console.WriteLine("{0} {1} {2}", p.ID, p.Name, p.Description);
            }

            Console.Read();
        }

参看博客：

http://www.cnblogs.com/bluedoctor/p/4384659.html

http://www.asp.net/web-api/overview/odata-support-in-aspnet-web-api/odata-v4/create-an-odata-v4-client-app

源码下载（包括服务端、客户端、以及OData客户端封装类库）