WCF JSON和AspnetCompatibility的配置

在WCF Service Application中加入<enableWebScript>

  
    

   
     <
   
     system.serviceModel
   
     >
   
     
 
   
     <
   
     behaviors
   
     >
   
     
 
   
     <
   
     endpointBehaviors
   
     >
   
     
 
   
     <
   
     behavior name
   
     =
   
     "
   
     ajaxbehavior
   
     "
   
     >
   
     
 
   
     <
   
     enableWebScript 
   
     />
   
     
 
   
     </
   
     behavior
   
     >
   
     
 
   
     </
   
     endpointBehaviors
   
     >
   
     
 
   
     </
   
     behaviors
   
     >
   
     
 
   
     <
   
     services
   
     >
   
     
 
   
     <
   
     service name
   
     =
   
     "
   
     JsonWCF.StudentService
   
     "
   
     >
   
     
 
   
     <
   
     endpoint binding
   
     =
   
     "
   
     webHttpBinding
   
     "
   
      contract
   
     =
   
     "
   
     JsonWCF.IStudentService
   
     "
   
      behaviorConfiguration
   
     =
   
     "
   
     ajaxbehavior
   
     "
   
      
   
     />
   
     
 
   
     </
   
     service
   
     >
   
     
 
   
     </
   
     services
   
     >
   
     

   
     </
   
     system.serviceModel
   
     >
  
    

定义Contract，添加[WebGet] Attribute允许HTTP Get访问

  
    

   
     [ServiceContract]
 
   
     public
   
      
   
     interface
   
      IStudentService
 {
 [OperationContract]
 [WebGet] 
 Student RandomStudent();
 }

 [DataContract]
 
   
     public
   
      
   
     class
   
      Student
 {
 [DataMember]
 
   
     public
   
      
   
     string
   
      FirstName { 
   
     get
   
     ; 
   
     set
   
     ; }

 [DataMember]
 
   
     public
   
      
   
     string
   
      LastName { 
   
     get
   
     ; 
   
     set
   
     ; }

 [DataMember]
 
   
     public
   
      DateTime DOB { 
   
     get
   
     ; 
   
     set
   
     ; }
 }
  
    

ASP.NET Compatibility

WCF可以以ASP.NET的方式host，这样就可以使用httpmodule httpcontext等一些asp.net特有的流程

在配置文件中添加

  
    

   
     <
   
     system.serviceModel
   
     >
   
     
 
   
     <
   
     serviceHostingEnvironment 
   
     aspNetCompatibilityEnabled
   
     ="true"
   
      
   
     />
   
     
 ...
  
    

定义Module (Namespace = JsonWCF)

  
    

   
     public
   
      
   
     class
   
      MyModule : IHttpModule
 {
 
   
     public
   
      
   
     void
   
      Dispose()
 {
 
 }

 
   
     public
   
      
   
     void
   
      Init(HttpApplication context)
 {
 context.BeginRequest 
   
     +=
   
      context_BeginRequest;
 }

 
   
     void
   
      context_BeginRequest(
   
     object
   
      sender, EventArgs e)
 {
 HttpContext.Current.Application[
   
     "
   
     key
   
     "
   
     ] 
   
     =
   
      
   
     "
   
     nothing is impossible
   
     "
   
     ;
 }
 }
  
    

web.config添加module

  
    

   
     <
   
     system.web
   
     >
   
     
 
   
     <
   
     httpModules
   
     >
   
     
 
   
     <
   
     add 
   
     name
   
     ="mymodule"
   
      type
   
     ="JsonWCF.MyModule"
   
     />
   
     
...
  
    

实现中就可以访问HttpApplication，注意需要为service标记AspNetCompatibilityRequirements，表示允许通过asp.net的方式访问

  
    

   
     [AspNetCompatibilityRequirements(
 RequirementsMode 
   
     =
   
      AspNetCompatibilityRequirementsMode.Allowed)]
 
   
     public
   
      
   
     class
   
      StudentService : IStudentService
 {
 
   
     public
   
      Student RandomStudent()
 {
 
   
     string
   
      firstname 
   
     =
   
      
   
     "
   
     null
   
     "
   
     ; 
 
   
     if
   
      (HttpContext.Current 
   
     !=
   
      
   
     null
   
     )
 firstname 
   
     =
   
      HttpContext.Current.Application[
   
     "
   
     key
   
     "
   
     ] 
   
     as
   
      
   
     string
   
     ;
 
   
     return
   
      
   
     new
   
      Student { DOB 
   
     =
   
      DateTime.Parse(
   
     "
   
     1983/10/14
   
     "
   
     ), FirstName 
   
     =
   
      firstname, LastName 
   
     =
   
      
   
     "
   
     Zhu
   
     "
   
      };
 }
 }
  
    

Remarks
如果将配置中的aspnetcompatibilityenabled改为false，wcf将不再走aspnet管道，application始终为空