### ASP
.NET 中实现微信支付退款功能
在 ASP
.NET 应用程序中实现微信支付的退款操作涉及多个步骤，包括但不限于发送请求到微信
服务器并处理响应。下面是一个简化版的代码示例来展示如何执行此过程：
```csharp
using
System;
using
System.IO;
using
System.Net;
using
System.Security
.Cryptography
.X509Certificates;
using
System.Text;
public class WeChatPayRefundService {
private string _appId; // 微信分配的小程序ID
private string _mchId; // 商户号
private string _
apiKey; //
API密钥
public void Refund(string outTradeNo, decimal totalFee, decimal refundFee) {
var url = "https
://
api.mch
.weixin.qq.com/sec
api/pay/refund";
var xmlRequest = new StringBuilder();
xmlRequest
.AppendLine("<xml>");
xmlRequest
.AppendFormat("<appid>{0}</appid>", _appId);
xmlRequest
.AppendFormat("<mch_id>{0}</mch_id>", _mchId);
xmlRequest
.AppendFormat("<out_trade_no>{0}</out_trade_no>", outTradeNo);
xmlRequest
.AppendFormat("<total_fee>{0}</total_fee>", Convert
.ToInt32(totalFee * 100)); // 单位转换成分为整数形式
xmlRequest
.AppendFormat("<refund_fee>{0}</refund_fee>", Convert
.ToInt32(refundFee * 100));
xmlRequest
.AppendFormat("<op_user_id>{0}</op_user_id>", _mchId); // 操作员账号，默认为商户号
xmlRequest
.AppendLine("</xml>");
HttpWebRequest request = WebRequest
.Create(url) as HttpWebRequest;
byte[] byteArray = Encoding
.UTF8
.GetBytes(xmlRequest
.ToString());
request
.Method = "POST";
request
.ContentType = "application/xml";
request
.ClientCertificates
.Add(new X509Certificate("
apiclient_cert
.p12", _mchId));
using (Stream dataStream = request
.GetRequestStream()) {
dataStream
.Write(byteArray, 0, byteArray
.Length);
}
try {
HttpWebResponse response = request
.GetResponse() as HttpWebResponse;
Stream streamResponse = response
.GetResponseStream();
StreamReader reader = new StreamReader(streamResponse);
Console
.WriteLine(reader
.ReadToEnd());
streamResponse
.Close();
reader
.Close();
} catch (
WebException ex) when ((ex
.Response as HttpWebResponse)?
.StatusCode == HttpStatusCode
.Forbidden ||
(ex
.Response as HttpWebResponse)?
.StatusCode == HttpStatusCode
.NotFound ||
(ex
.Response as HttpWebResponse)?
.StatusCode == HttpStatusCode
.BadRequest) {
using (var errorReader = new StreamReader(ex
.Response
.GetResponseStream())) {
Console
.WriteLine(errorReader
.ReadToEnd());
}
}
}
}
```
上述代码展示了发起一次退款请求的过程[^1]。
为了使这段代码正常工作，还需要确保已经配置好了相应的证书以及设置了正确的参数值（如`_appId`, `_mchId`, 和 `_
apiKey`）。此外，在实际项目里应该加入更多的异常处理机制和服务端验证逻辑以提高系统的健壮性和安全性。
扫一扫
7490
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
