C# 微信v3退款

1.退款須要退款證書。C#都是用p12的證書，雙擊證書導入，密碼是mch_id（商戶號）

2.調用微信退款接口進行退款操做

  

 1 string  resp=string.Empty  
 2 string cert = Server.MapPath("apiclient_cert.p12"); 
 3    string password = mch_id;（商戶號）
 4     ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
 5 
 6   //這兩句特別注意
 7 
 8   // X509Certificate cer = new X509Certificate(cert, password);//線下發布須要添加的
 9      X509Certificate2 cer = new X509Certificate2(cert, password, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);//線上發        布須要添加
10 
11    HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url);
12         webrequest.ClientCertificates.Add(cer);
13         webrequest.Method = "post";
14         webrequest.ContentType = "application/x-www-form-urlencoded";
15         webrequest.ContentLength = xml.Length;
16         HttpWebResponse response = null;
17    try
18         {
19             StreamWriter swRequestWriter = new StreamWriter(webrequest.GetRequestStream());
20             swRequestWriter.Write(xml);
21 
22             if (swRequestWriter != null)
23                 swRequestWriter.Close();
24 
25             response = (HttpWebResponse)webrequest.GetResponse();
26             using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default))
27             {
28                 resp = reader.ReadToEnd();
29             }
30         }
31  catch (Exception exp)
32         {
33             throw exp;
34         }
35         finally
36         {
37             if (response != null)
38                 response.Close();
39         }

分享幾個退款時遇到的問題
一、退款提示:訂單號非法
  緣由：退款的訂單號錯誤致使的
二、退款時提示：基礎鏈接已關閉，或被意外關閉（驗證證書的問題）
  緣由： 首先要經過證書請求退款的接口，其次要把下面的這行語句

 // X509Certificate cer = new X509Certificate(cert, password);//線下發布須要添加的 修改爲這樣的才能夠
 X509Certificate2 cer = new X509Certificate2(cert, password, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);//線上發        布須要添加三、 Miss Parameters    緣由：傳參數時，參數的名字和文檔大小寫不一致四、每次退款，退款的訂單號不能相同，不然沒法退款