如何创建一个RESTful WCF Service

<?xml version="1.0"?>
<configuration>
    <system.web>
      <compilation debug="true" targetFramework="4.0" />
      <authentication mode="None" />
    </system.web>
    <system.serviceModel>
        <behaviors>
            <endpointBehaviors>
                <behavior name="SandwichServices.CostServiceBehavior">                    
                    <webHttp helpEnabled="true"/>
                </behavior>
            </endpointBehaviors>
            <serviceBehaviors>
              <behavior name="SandwichServices.CostServiceServiceBehavior" >
                <serviceMetadata httpGetEnabled="true" />
              </behavior>
            </serviceBehaviors>
        </behaviors>
        <serviceHostingEnvironment aspNetCompatibilityEnabled="true"
            multipleSiteBindingsEnabled="true" />
        <services>
            <service name="SandwichServices.CostService" behaviorConfiguration="SandwichServices.CostServiceServiceBehavior">
                <endpoint address="" behaviorConfiguration="SandwichServices.CostServiceBehavior"
                    binding="webHttpBinding" contract="SandwichServices.CostService" />
              <endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex" />
            </service>
        </services>
    </system.serviceModel>
</configuration>

using System;
using System.Runtime.Serialization;

namespace SandwichServices
{
    [DataContract]
    public class Employee
    {
        private Guid id;
        private string name;
        private DateTime birthdate;

        [DataMember]
        public Guid Id
        {
            get { return id; }
            set { id = value; }
        }

        [DataMember]
        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        [DataMember]
        public DateTime Birthdate
        {
            get { return birthdate; }
            set { birthdate = value; }
        }
    }
}

using System;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.ServiceModel.Web;

namespace SandwichServices
{
    [ServiceContract(Namespace = "SandwichServices")]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class CostService
    {
        // To use HTTP GET, add [WebGet] attribute. (Default ResponseFormat is WebMessageFormat.Json)
        // To create an operation that returns XML,
        //     add [WebGet(ResponseFormat=WebMessageFormat.Xml)],
        //     and include the following line in the operation body:
        //         WebOperationContext.Current.OutgoingResponse.ContentType = "text/xml";
        [OperationContract]
        [WebInvoke(Method = "PUT", UriTemplate = "Employees/AddEmployee", ResponseFormat = WebMessageFormat.Xml)]
        public Guid AddEmployee(Employee employee)
        {
            return Guid.NewGuid();
        }

        [OperationContract]
        [WebInvoke(Method = "DELETE", UriTemplate = "Employees/DeleteEmployee?id={id}", ResponseFormat = WebMessageFormat.Xml)]
        public void DeleteEmployee(string id)
        {
            return;
        }

        [OperationContract]
        [WebInvoke(Method = "POST", UriTemplate = "Employees/UpdateEmployee", ResponseFormat = WebMessageFormat.Xml)]
        public void UpdateEmployee(Employee employee)
        {
            return;
        }

        [OperationContract]
        [WebGet(UriTemplate = "Employees/GetEmployee?id={id}", ResponseFormat = WebMessageFormat.Xml)]
        public Employee GetEmployee(string id)
        {
            return new Employee() { Id = new Guid(id), Name = "Neil Klugman", Birthdate = new DateTime(1930, 1, 1) };
        }
    }
}

using System;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.ServiceModel.Web;

namespace SandwichServices
{
    [ServiceContract(Namespace = "SandwichServices")]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class CostService
    {
        // To use HTTP GET, add [WebGet] attribute. (Default ResponseFormat is WebMessageFormat.Json)
        // To create an operation that returns XML,
        //     add [WebGet(ResponseFormat=WebMessageFormat.Xml)],
        //     and include the following line in the operation body:
        //         WebOperationContext.Current.OutgoingResponse.ContentType = "text/xml";
        [OperationContract]
        [WebInvoke(Method = "PUT", UriTemplate = "Employees/AddEmployee", ResponseFormat=WebMessageFormat.Json)]
        public Guid AddEmployee(Employee employee)
        {
            return Guid.NewGuid();
        }

        [OperationContract]
        [WebInvoke(Method = "DELETE", UriTemplate = "Employees/DeleteEmployee?id={id}", ResponseFormat = WebMessageFormat.Json)]
        public void DeleteEmployee(string id)
        {
            return;
        }

        [OperationContract]
        [WebInvoke(Method = "POST", UriTemplate = "Employees/UpdateEmployee", ResponseFormat = WebMessageFormat.Json)]
        public void UpdateEmployee(Employee employee)
        {
            return;
        }

        [OperationContract]
        [WebGet(UriTemplate = "Employees/GetEmployee?id={id}", ResponseFormat = WebMessageFormat.Json)]
        public Employee GetEmployee(string id)
        {
            return new Employee() { Id = new Guid(id), Name = "Neil Klugman", Birthdate = new DateTime(1930, 1, 1) };
        }
    }
}