1、准备参数

新建一个公共参数配置类NewAlipayconfig （可将参数存放到config配置文件中读取）

public class NewAlipayconfig{public NewAlipayconfig(){//// TODO: 在此处添加构造函数逻辑//}// 应用ID,您的APPIDpublic static string app_id = "1231213";// 支付宝网关public static string gatewayUrl = "https://openapi.alipay.com/gateway.do";// 支付宝公钥,查看地址：https://openhome.alipay.com/platform/keyManage.htm 对应APPID下的支付宝公钥。 public static string alipay_public_key = "MIIBIjANBgkqhk+ng8kcURzCNMuyOGIUsssQM66m6hNBU6BXqCPcKZDEZVdlXW3it4jqDveq1utRAoYNPj9wwSFiXxmmjA4/7LhlOMxwJ28R+7aB4tDgiYjixcuQIDAQAB";// 商户私钥，您的原始格式RSA私钥public static string private_key = "00j7jSssF8+2QdNcIbIhAoGBAPYCd+PLanGuNHMDzumBQ==";// 签名方式public static string sign_type = "RSA2";// 编码格式public static string charset = "UTF-8";//同步回调地址public static string AliPayReturn_url = "同步回调地址：即支付成功之后，跳转的页面";//异步回调通知地址public static string AliPayNotify_url = "异步回调通知地址：即支付成功，会主动调用该地址";}

注意：1、以上参数app_id、gatewayUrl可直接在支付宝商户平台获取

2、通过支付宝RSA签名验签工具生成一对商户公钥和秘钥，商户秘钥保存（即private_key，签名时使用），然后通过商户公钥到支付宝商户平台设置，来获取支付宝公钥

3、建议将商户系统业务状态的修改，通过异步通知地址来更新，以异步通知的地址为准

2、支付宝PC端支付

DefaultAopClient client = new DefaultAopClient(NewAlipayconfig.gatewayUrl, NewAlipayconfig.app_id, NewAlipayconfig.private_key, "json", "1.0", "RSA2", NewAlipayconfig.alipay_public_key, "utf-8", false);// 外部订单号，商户网站订单系统中唯一的订单号string out_trade_no = 100001;// 订单名称string subject = "购买商品";// 付款金额string total_amout = 0.01;// 商品描述string body = "支付宝商品支付";// 组装业务参数modelAlipayTradePagePayModel model = new AlipayTradePagePayModel();model.Body = body;model.Subject = subject;model.TotalAmount = total_amout;model.OutTradeNo = out_trade_no;model.ProductCode = "FAST_INSTANT_TRADE_PAY";AlipayTradePagePayRequest request = new AlipayTradePagePayRequest();// 设置同步回调地址request.SetReturnUrl(NewAlipayconfig.AliPayReturn_url);// 设置异步通知接收地址request.SetNotifyUrl(NewAlipayconfig.AliPayNotify_url);// 将业务model载入到requestrequest.SetBizModel(model);AlipayTradePagePayResponse response = null;try{response = client.pageExecute(request, null, "post");Response.Write(response.Body);}catch (Exception exp){throw exp;}

通过以上代码即可实现PC端支付宝支付功能，建议首次接入支付宝支付功能时，先将支付宝沙箱环境测通（支付宝支付测试环境）

3、移动端支付宝支付

DefaultAopClient clientWap = new DefaultAopClient(NewAlipayconfig.gatewayUrl, NewAlipayconfig.app_id, NewAlipayconfig.private_key, "json", "1.0", NewAlipayconfig.sign_type, NewAlipayconfig.alipay_public_key, NewAlipayconfig.charset, false);// 外部订单号，商户网站订单系统中唯一的订单号string out_trade_no_wap = 100002;// 订单名称string subject_wap = "购买商品";// 付款金额string total_amout_wap = 0.01;// 商品描述string body_wap = "支付宝商品支付";// 支付中途退出返回商户网站地址string quit_url = "";//如果用户中途退出 则跳转到该页面// 组装业务参数modelAlipayTradeWapPayModel modelWap = new AlipayTradeWapPayModel();modelWap.Body = body_wap;modelWap.Subject = subject_wap;modelWap.TotalAmount = total_amout_wap;modelWap.OutTradeNo = out_trade_no_wap;modelWap.ProductCode = "QUICK_WAP_WAY";modelWap.QuitUrl = quit_url;AlipayTradeWapPayRequest requestWap = new AlipayTradeWapPayRequest();// 设置支付完成同步回调地址requestWap.SetReturnUrl(NewAlipayconfig.AliPayReturn_url);// 设置支付完成异步通知接收地址requestWap.SetNotifyUrl(NewAlipayconfig.AliPayNotify_url);// 将业务model载入到requestrequestWap.SetBizModel(modelWap);AlipayTradeWapPayResponse responseWap = null;try{responseWap = clientWap.pageExecute(requestWap, null, "post");Response.Write(responseWap.Body);}catch (Exception exp){throw exp;}

下面提供支付宝.net版sdk和签名生成工具：链接：https://pan.baidu.com/s/1BCW69nfS2uPhqmlThZOvhw 提取码：z404