想用c# 的wcf处理支付宝的异步通知，但是不知道如何定义接口里的接收参数和返回值

Question

[OperationContract]
        [WebInvoke(Method = "POST", UriTemplate = MerchantServiceUri.AsynchConfirmAlipayRecharge, BodyStyle = WebMessageBodyStyle.Bare,
            RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]

string AcceptAlipayNotify(Stream stream);

上面是一个普通的wcf接口定义，我有三个地方不太懂

1、支付宝的异步通知虽然是post方法，但是参数都是在url里面的，例如：

https: //商家网站通知地址?voucher_detail_list=[{"amount":"0.20","merchantContribute":"0.00","name":"5折券","otherContribute":"0.20","type":"ALIPAY_DISCOUNT_VOUCHER","voucherId":"2016101200073002586200003BQ4"}]&fund_bill_list=[{"amount":"0.80","fundChannel":"ALIPAYACCOUNT"},{"amount":"0.20","fundChannel":"MDISCOUNT"}]&subject=PC网站支付交易&trade_no=2016101221001004580200203978&gmt_create=2016-10-12 21:36:12&notify_type=trade_status_sync&total_amount=1.00&out_trade_no=mobile_rdm862016-10-12213600&invoice_amount=0.80&seller_id=2088201909970555&notify_time=2016-10-12 21:41:23&trade_status=TRADE_SUCCESS&gmt_payment=2016-10-12 21:37:19&receipt_amount=0.80&passback_params=passback_params123&buyer_id=2088102114562585&app_id=2016092101248425&notify_id=7676a2e1e4e737cff30015c4b7b55e3kh6& sign_type=RSA2&buyer_pay_amount=0.80&sign=***&point_amount=0.00

我应该如何获取这些参数？

2、如果获取了这些参数，如何解析成键值对的模式。 

3、返回值应该如何处理。支付宝要求返回sucess，不能带任何其他字符，ResponseFormat = WebMessageFormat.Json这里感觉就不太对。是否应该用stream来作为返回值？

Answer 1

这样就好了。没啥问题，记得采纳一下