IronPython 承载和消费WCF服务

张善友

发布于 2018-01-22 10:58:49

8940

发布于 2018-01-22 10:58:49

是开始学习IronPython 的时候了文章里谈到了“IronPython 2.6提供了新特性clrtype，允许程序员用纯IronPython代码提供property、attribute等CLR类型信息。这样IronPython代码就可以无缝地与Sliverlight、WCF等框架集成。”我们就用clrtype来看看怎么承载WCF服务和消费WCF服务。WCF的契约需要定义接口，这是目前IronPython 尚未支持的功能，所以我们先用C#定义个一个WCF的契约：

using System; 
using System.Collections.Generic; 
using System.ServiceModel; 
namespace TestServiceInterface 
{ 
??? /// <summary> 
??? /// Description of MyClass. 
??? /// </summary> 
??? [ServiceContract]? 
??? public interface ImyService? 
??? {? 
??????? [OperationContract] 
???????? string GetData(int value);? 
??? }? 
}

编译成一个程序集TestServiceInterface.dll, 然后在IronPython中实现WCF服务myWcfService.myService，代码如下：

import clr 
import clrtype? 
clr.AddReference('System.ServiceModel') 
clr.AddReference('TestServiceInterface') 
from TestServiceInterface import ImyService? 
from System import Console, Uri? 
from System.ServiceModel import (ServiceHost, BasicHttpBinding, ServiceBehaviorAttribute, InstanceContextMode)? 
ServiceBehavior = clrtype.attribute(ServiceBehaviorAttribute)? 
class myService(ImyService):? 
??? __metaclass__ = clrtype.ClrClass? 
??? _clrnamespace = "myWcfService" 
??? _clrclassattribs = [ServiceBehavior(InstanceContextMode=InstanceContextMode.Single)]? 

??? def GetData(self, value):? 
??????? return r"IronPython WCF服务: 你的输入内容是: %s" % value??? 
sh = ServiceHost(myService()? ,Uri("http://localhost:7000/myWcfService%22 ) ) 
sh.AddServiceEndpoint(? 
?????? clr.GetClrType(ImyService),? 
??????? BasicHttpBinding(), 
?????? "")? 
sh.Open()? 
Console.WriteLine("Press <ENTER> to terminate\n")? 
Console.ReadLine()? 
sh.Close()

这里用到了一个clrtype模块, 代码参加IronPython的Sample工程，可以从这里下载：http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=12482 ，第一个例子就是ClrType ，从这里拷贝出来放到我们的py目录下。类myService 必须加一个attribute InstanceContextMode.Single ServiceBehavior 。

我们再来写个测试的客户端代码：

import clr? 
clr.AddReference('System.ServiceModel')? 
from?? System import Console 
import System.ServiceModel? 
clr.AddReference('TestServiceInterface')? 
from TestServiceInterface import ImyService? 
mycf = System.ServiceModel.ChannelFactory[ImyService](? 
System.ServiceModel.BasicHttpBinding(),? 
System.ServiceModel.EndpointAddress("http://localhost:7000/myWcfService%22))
wcfcli = mycf.CreateChannel()? 
print r"IronPython WCF 服务的返回结果是:\n%s" % wcfcli.GetData(11) 
Console.WriteLine("Press <ENTER> to terminate\n")? 
Console.ReadLine()

运行起来可以得到的结果如下：