ASP.Net項目中實現微信APP支付功能
最近挺忙的，沒時間寫東西。然後在弄微信APP支付，網上的搜索一趟，都比較凌亂，我也遇到一些坑，不過也算弄好瞭，記錄分享一下。
1、準備各種調用接口需要的參數，配置app.config。
<!--AppID--> <add key="AppID" value="" /> <!--AppSecret--> <add key="AppSecret" value="" /> <!--商戶號--> <add key="MchID" value="" /> <!--APIKey--> <add key="APIKey" value="" />
2、調用統一下單API，直接上代碼瞭。
/// <summary>
/// Builds the request.
/// </summary>
/// <returns></returns>
public static string BuildRequest()
{
var dicParam = CreateParam();
var signString = CreateURLParamString(dicParam);
var preString = signString + "&key=" + ConfigHelper.APIKey;
var sign = Sign(preString, "utf-8").ToUpper();
dicParam.Add("sign", sign);
return BuildForm(dicParam);
}
/// <summary>
/// Generates the out trade no.
/// </summary>
/// <returns></returns>
private static string GenerateOutTradeNo()
{
var ran = new Random();
return $"{ConfigHelper.MchID}{DateTime.Now:yyyyMMddHHmmss}{ran.Next(999)}";
}
/// <summary>
/// Signs the specified prestr.
/// </summary>
/// <param name="prestr">The prestr.</param>
/// <param name="_input_charset">The input charset.</param>
/// <returns></returns>
private static string Sign(string prestr, string _input_charset)
{
var sb = new StringBuilder(32);
MD5 md5 = new MD5CryptoServiceProvider();
var t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(prestr));
foreach (var t1 in t)
{
sb.Append(t1.ToString("x").PadLeft(2, '0'));
}
return sb.ToString();
}
/// <summary>
/// Creates the parameter.
/// </summary>
/// <returns></returns>
private static SortedDictionary<string, string> CreateParam()
{
const string amount = "1";
double dubamount;
double.TryParse(amount, out dubamount);
var notify_url = ConfigHelper.WebSiteUrl + "/api/v1/testWeiXin"; //支付完成後的回調處理頁面
const string detail = "xxxx";
var dic = new SortedDictionary<string, string>
{
{"appid", ConfigHelper.AppID},//賬號ID
{"mch_id", ConfigHelper.MchID},//商戶號
{"nonce_str", Guid.NewGuid().ToString().Replace("-", "")},//隨機字符串
{"body", detail}, //商品描述
{"out_trade_no", GenerateOutTradeNo()},//商戶訂單號
{"total_fee", (dubamount * 100).ToString(CultureInfo.InvariantCulture)},//總金額
{"spbill_create_ip", GeneralHelper.GetIP()},//終端IP
{"notify_url", notify_url},//通知地址
{"trade_type", "APP"}//交易類型
};
return dic;
}
/// <summary>
/// Creates the URL parameter string.
/// </summary>
/// <param name="dicArray">The dic array.</param>
/// <returns></returns>
private static string CreateURLParamString(SortedDictionary<string, string> dicArray)
{
var prestr = new StringBuilder();
foreach (var temp in dicArray.OrderBy(o => o.Key))
{
prestr.Append(temp.Key + "=" + temp.Value + "&");
}
var nLen = prestr.Length;
prestr.Remove(nLen - 1, 1);
return prestr.ToString();
}
/// <summary>
/// Builds the form.
/// </summary>
/// <param name="dicParam">The dic parameter.</param>
/// <returns></returns>
private static string BuildForm(SortedDictionary<string, string> dicParam)
{
var sbXML = new StringBuilder();
sbXML.Append("<xml>");
foreach (var temp in dicParam)
{
sbXML.Append("<" + temp.Key + ">" + temp.Value + "</" + temp.Key + ">");
}
sbXML.Append("</xml>");
return sbXML.ToString();
}
/// <summary>
/// Froms the XML.
/// </summary>
/// <param name="xml">The XML.</param>
/// <returns></returns>
/// <exception cref="Exception">將空的xml串轉換為WxPayData不合法!</exception>
public static SortedDictionary<string, string> FromXml(string xml)
{
var sortDic = new SortedDictionary<string, string>();
if (string.IsNullOrEmpty(xml))
{
throw new Exception("將空的xml串轉換為WxPayData不合法!");
}
var xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xml);
var xmlNode = xmlDoc.FirstChild;//獲取到根節點<xml>
var nodes = xmlNode.ChildNodes;
foreach (XmlNode xn in nodes)
{
var xe = (XmlElement)xn;
if (!sortDic.ContainsKey(xe.Name))
sortDic.Add(xe.Name, xe.InnerText);
}
return sortDic;
}
/// <summary>
/// Posts the specified URL.
/// </summary>
/// <param name="url">The URL.</param>
/// <param name="content">The content.</param>
/// <param name="contentType">Type of the content.</param>
/// <returns></returns>
/// <exception cref="Exception">POST請求錯誤" + e</exception>
public static string Post(string url, string content, string contentType = "application/x-www-form-urlencoded")
{
string result;
try
{
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(contentType));
var stringContent = new StringContent(content, Encoding.UTF8);
var response = client.PostAsync(url, stringContent).Result;
result = response.Content.ReadAsStringAsync().Result;
}
}
catch (Exception e)
{
throw new Exception("POST請求錯誤" + e);
}
return result;
}
3、生成預付訂單，獲取prepay_id。
/// <summary>
/// Gets the value from dic.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="dic">The dic.</param>
/// <param name="key">The key.</param>
/// <returns></returns>
public static T GetValueFromDic<T>(IDictionary<string, string> dic, string key)
{
string val;
dic.TryGetValue(key, out val);
var returnVal = default(T);
if (val != null)
returnVal = (T)Convert.ChangeType(val, typeof(T));
return returnVal;
}
/// <summary>
/// Builds the application pay.
/// </summary>
/// <param name="prepayid">The prepayid.</param>
/// <returns></returns>
public static string BuildAppPay(string prepayid)
{
var dicParam = CreateWapAndAppPayParam(prepayid);
var signString = CreateURLParamString(dicParam);
var preString = signString + "&key=" + ConfigHelper.APIKey;
var sign = Sign(preString, "utf-8").ToUpper();
dicParam.Add("sign", sign);
return JsonConvert.SerializeObject(
new
{
appid = dicParam["appid"],
partnerid = dicParam["partnerid"],
prepayid = dicParam["prepayid"],
package = dicParam["package"],
noncestr = dicParam["noncestr"],
timestamp = dicParam["timestamp"],
sign = dicParam["sign"]
});
}
/// <summary>
/// Creates the wap and application pay parameter.
/// </summary>
/// <param name="prepayId">The prepay identifier.</param>
/// <returns></returns>
private static SortedDictionary<string, string> CreateWapAndAppPayParam(string prepayId)
{
var dic = new SortedDictionary<string, string>
{
{"appid", ConfigHelper.AppID},//公眾賬號ID
{"partnerid", ConfigHelper.MchID},//商戶號
{"prepayid", prepayId},//預支付交易會話ID
{"package", "Sign=WXPay"},//擴展字段
{"noncestr", Guid.NewGuid().ToString().Replace("-", "")},//隨機字符串
{
"timestamp",
(Convert.ToInt32((DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0)).TotalSeconds)).ToString()
}//時間戳
};
return dic;
}
/// <summary>
/// Validatons the query result.
/// </summary>
/// <param name="dic">The dic.</param>
/// <returns></returns>
public static bool ValidatonQueryResult(SortedDictionary<string, string> dic)
{
var result = false;
if (dic.ContainsKey("return_code") && dic.ContainsKey("return_code"))
{
if (dic["return_code"] == "SUCCESS" && dic["result_code"] == "SUCCESS")
result = true;
}
if (result) return true;
var sb = new StringBuilder();
foreach (var item in dic.Keys)
{
sb.Append(item + ":" + dic[item] + "|");
}
return false;
}
4、調用獲取支付信息，給到APP發起支付操作。
var requestXml = WeiXinUtil.BuildRequest();
var resultXml = WeiXinUtil.Post("https://api.mch.weixin.qq.com/pay/unifiedorder", requestXml);
var dic = WeiXinUtil.FromXml(resultXml);
string returnCode;
dic.TryGetValue("return_code", out returnCode);
if (returnCode == "SUCCESS")
{
var prepay_id = WeiXinUtil.GetValueFromDic<string>(dic, "prepay_id");
if (!string.IsNullOrEmpty(prepay_id))
{
var payInfo = JsonConvert.DeserializeObject<WeiXinUtil.WxPayModel>(WeiXinUtil.BuildAppPay(prepay_id));
json.Add(new JProperty("appid", payInfo.appid));
json.Add(new JProperty("partnerid", payInfo.partnerid));
json.Add(new JProperty("prepayid", payInfo.prepayid));
json.Add(new JProperty("package", payInfo.package));
json.Add(new JProperty("noncestr", payInfo.noncestr));
json.Add(new JProperty("timestamp", payInfo.timestamp));
json.Add(new JProperty("sign", payInfo.sign));
json.Add(new JProperty("code", 0));
json.Add(new JProperty("msg", "成功"));
return this.Jsonp(json.ToString());
}
else
{
json.Add(new JProperty("code", 40028));
json.Add(new JProperty("msg", "支付錯誤:" + WeiXinUtil.GetValueFromDic<string>(dic, "err_code_des")));
return this.Jsonp(json.ToString());
}
}
else
{
return this.Jsonp(ApiException.OrderFailed());
}
5、APP支付完成，獲得回調信息，就OK瞭。
var context = this.HttpContext;
var request = context.Request;
var verifyResult = false;
var requestXml = WeiXinUtil.GetRequestXmlData(request);
var dic = WeiXinUtil.FromXml(requestXml);
var returnCode = WeiXinUtil.GetValueFromDic<string>(dic, "return_code");
if (!string.IsNullOrEmpty(returnCode) && returnCode == "SUCCESS")//通訊成功
{
var result = WeiXinUtil.WePayNotifyValidation(dic);
if (result)
{
var transactionid = WeiXinUtil.GetValueFromDic<string>(dic, "transaction_id");
if (!string.IsNullOrEmpty(transactionid))
{
var queryXml = WeiXinUtil.BuildQueryRequest(transactionid, dic);
var queryResult = WeiXinUtil.Post("https://api.mch.weixin.qq.com/pay/orderquery", queryXml);
var queryReturnDic = WeiXinUtil.FromXml(queryResult);
if (WeiXinUtil.ValidatonQueryResult(queryReturnDic))//查詢成功
{
verifyResult = true;
var status = WeiXinUtil.GetValueFromDic<string>(dic, "result_code");
if (!string.IsNullOrEmpty(status) && status == "SUCCESS")
{
var order = new Order()
{
OrderNumber = WeiXinUtil.GetValueFromDic<string>(dic, "out_trade_no"),
TransactionId = transactionid,
ProductPrice = WeiXinUtil.GetValueFromDic<decimal>(dic, "total_fee") / 100,
TradeType = WeiXinUtil.GetValueFromDic<string>(dic, "trade_type"),
BankType = WeiXinUtil.GetValueFromDic<string>(dic, "bank_type"),
PayDate = DateTime.Parse(WeiXinUtil.GetValueFromDic<string>(dic, "time_end")),
StatusId = 1,
IsPresent = false,
AddDate = DateTime.Now,
IsDelete = false
};
CURD.Add(order, ConfigHelper.WriteDB);
WeiXinUtil.BuildReturnXml("OK", "成功");
}
}
else
WeiXinUtil.BuildReturnXml("FAIL", "訂單查詢失敗");
}
else
WeiXinUtil.BuildReturnXml("FAIL", "支付結果中微信訂單號不存在");
}
else
WeiXinUtil.BuildReturnXml("FAIL", "簽名失敗");
}
else
{
string returnmsg;
dic.TryGetValue("return_msg", out returnmsg);
throw new Exception("異步通知錯誤：" + returnmsg);
}
return verifyResult;
/// <summary>
/// Gets the request XML data.
/// </summary>
/// <param name="request">The request.</param>
/// <returns></returns>
public static string GetRequestXmlData(HttpRequestBase request)
{
var stream = request.InputStream;
int count;
var buffer = new byte[1024];
var builder = new StringBuilder();
while ((count = stream.Read(buffer, 0, 1024)) > 0)
{
builder.Append(Encoding.UTF8.GetString(buffer, 0, count));
}
stream.Flush();
stream.Close();
return builder.ToString();
}
/// <summary>
/// Wes the pay notify validation.
/// </summary>
/// <param name="dic">The dic.</param>
/// <returns></returns>
public static bool WePayNotifyValidation(SortedDictionary<string, string> dic)
{
var sign = GetValueFromDic<string>(dic, "sign");
if (dic.ContainsKey("sign"))
{
dic.Remove("sign");
}
var tradeType = GetValueFromDic<string>(dic, "trade_type");
var preString = CreateURLParamString(dic);
if (string.IsNullOrEmpty(tradeType))
{
var preSignString = preString + "&key=" + ConfigHelper.APIKey;
var signString = Sign(preSignString, "utf-8").ToUpper();
return signString == sign;
}
else
return false;
}
/// <summary>
/// Builds the query request.
/// </summary>
/// <param name="transactionId">The transaction identifier.</param>
/// <param name="dic">The dic.</param>
/// <returns></returns>
public static string BuildQueryRequest(string transactionId, SortedDictionary<string, string> dic)
{
var dicParam = CreateQueryParam(transactionId);
var signString = CreateURLParamString(dicParam);
var key = ConfigHelper.APIKey;
var preString = signString + "&key=" + key;
var sign = Sign(preString, "utf-8").ToUpper();
dicParam.Add("sign", sign);
return BuildForm(dicParam);
}
/// <summary>
/// Creates the query parameter.
/// </summary>
/// <param name="transactionId">The transaction identifier.</param>
/// <returns></returns>
private static SortedDictionary<string, string> CreateQueryParam(string transactionId)
{
var dic = new SortedDictionary<string, string>
{
{"appid", ConfigHelper.AppID},//公眾賬號ID
{"mch_id", ConfigHelper.MchID},//商戶號
{"nonce_str", Guid.NewGuid().ToString().Replace("-", "")},//隨機字符串
{"transaction_id", transactionId}//微信訂單號
};
return dic;
}
/// <summary>
/// Builds the return XML.
/// </summary>
/// <param name="code">The code.</param>
/// <param name="returnMsg">The return MSG.</param>
/// <returns></returns>
public static string BuildReturnXml(string code, string returnMsg)
{
return
$"<xml><return_code><![CDATA[[code]]]></return_code><return_msg><![CDATA[{returnMsg}]]></return_msg></xml>";
}
6、總結：這個可以直接拿來用瞭，反反復復測試瞭很多遍，遇到的問題有關於錢，還有簽名的問題，調試都解決瞭。繼續解決問題，積累經驗。
到此這篇關於ASP.Net項目中實現微信APP支付功能的文章就介紹到這瞭。希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。
推薦閱讀：
- C#調用百度翻譯實現翻譯HALCON的示例
- c# 使用Json.NET實現json序列化
- c# 靜態類的使用場景
- emoji表情與unicode編碼互轉的實現(JS,JAVA,C#)
- C#從前面或後面按指定數量刪除字符串