微信扫码支付asp.net(C#)实现步骤

[HttpPost]
public ActionResult index(decimal amount)
{
//生成订单10位序列号，此处用时间和随机数生成，商户根据自己调整，保证唯一
string order_no = DateTime.Now.ToString("yyyyMMddHHmmss") + TenpayUtil.BuildRandomStr(4);
//这里是数据操作，代码已删除

ViewData["weixin_pay_qr_code"] = string.Format("/get_qrcode?product_id={0}", order_no);
return View();
}

public void get_qrcode(string product_id)
{
WxPayHelper helper = new WxPayHelper();
Dictionary<string, string> dic = new Dictionary<string, string>();
dic.Add("appid", config_util.mp_weixin_appid);
dic.Add("mch_id", config_util.weixin_mch_id);
dic.Add("nonce_str", TenpayUtil.getNoncestr());
dic.Add("product_id", product_id);
dic.Add("time_stamp", TenpayUtil.getTimestamp());
dic.Add("sign", helper.GetSign(dic));
string url = WxPayHelper.FormatBizQueryParaMap(dic, false);//这里不要url编码

string code = "weixin://wxpay/bizpayurl?" + url;
var qrc = Create_ImgCode(code, 6);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
qrc.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
byte[] bytes = ms.GetBuffer();  //byte[]   bytes=   ms.ToArray(); 这两句都可以，至于区别么，下面有解释
ms.Close();

Response.BinaryWrite(bytes);
return;
}

public ContentResult index()
{

if (Request.RequestType == "POST")
{
try
{
WxPayHelper helper = new WxPayHelper();
StreamReader reader = new StreamReader(Request.InputStream);
String xmlData = reader.ReadToEnd();
helper.ReceivePostXmlData(xmlData);
common_util.WriteLog("接收post来的xmlData=" + xmlData);
if (helper.CheckSign())
{
common_util.WriteLog("签名验证通过");
string product_id = helper.GetProductId();
common_util.WriteLog("产品id=" + product_id);
string order_no = product_id;if (产品ID存在)
{
#region 业务处理
helper.SetParameter("body", "用户充值，用户号：" + item.user_id);
helper.SetParameter("out_trade_no", order_no);
helper.SetParameter("total_fee", (item.amount * 100).ToString("#"));//这里单位是分
helper.SetParameter("notify_url", "http//www.openweixin.com.cn/notify");
helper.SetParameter("trade_type", "NATIVE");
string prepay_id = helper.GetPrepayId();
common_util.WriteLog("prepay_id=" + prepay_id);
if (!string.IsNullOrEmpty(prepay_id))
{
helper.SetReturnParameter("return_code", "SUCCESS");
helper.SetReturnParameter("result_code", "SUCCESS");
helper.SetReturnParameter("prepay_id", prepay_id);
helper.SetReturnParameter("appid", helper.GetAppId);
helper.SetReturnParameter("mch_id", helper.GetMch_Id);
helper.SetReturnParameter("nonce_str", TenpayUtil.getNoncestr());
}
else
{
helper.SetReturnParameter("return_code", "SUCCESS");//返回状态码
helper.SetReturnParameter("result_code", "FAIL");//业务结果
helper.SetReturnParameter("err_code_des", "预订单生产失败");
}
#endregion
}
else
{
helper.SetReturnParameter("return_code", "SUCCESS");//返回状态码
helper.SetReturnParameter("result_code", "FAIL");//业务结果
helper.SetReturnParameter("err_code_des", "此商品无效");//业务结果
}
}
else
{
helper.SetReturnParameter("return_code", "FAIL");
helper.SetReturnParameter("return_msg", "签名失败");
common_util.WriteLog("签名验证没有通过");
}
string xmlStr = helper.GetReturnXml();
common_util.WriteLog("返回xml=" + xmlStr);
Response.ContentType = "text/xml";
Response.Clear();
Response.Write(xmlStr);
Response.End();
}
catch (Exception ex)
{
common_util.WriteLog("异常了" + ex);
}
}
return Content("OK");
}

if (Request.RequestType == "POST")
{
try
{
WxPayHelper helper = new WxPayHelper();
StreamReader reader = new StreamReader(Request.InputStream);
String xmlData = reader.ReadToEnd();
helper.ReceivePostXmlData(xmlData);
common_util.WriteLog("Notify_接收post来的xmlData=" + xmlData);
if (helper.CheckSign())
{
Dictionary<string, string> dicBack = helper.GetParameter();//获取所有参数
if (dicBack != null && dicBack.Keys.Contains("return_code"))
{
if (dicBack["return_code"] == "SUCCESS")
{
common_util.WriteLog("return_code=SUCCESS");
if (dicBack["result_code"] == "SUCCESS")
{
common_util.WriteLog("result_code=SUCCESS");
string out_trade_no = dicBack["out_trade_no"];//商户订单号
common_util.WriteLog("out_trade_no=" + out_trade_no);

//1.验证商户订单号是否被处理
//2.处理过直接返回成功，否则返回
//此处根据out_trade_no 处理业务数据
//处理业务数据结束

common_util.WriteLog("Notify_验证签名成功");
helper.SetReturnParameter("return_code", "SUCCESS");
helper.SetReturnParameter("return_msg", "");
}
}
if (dicBack["return_code"] == "FAIL")
{
common_util.WriteLog("Notify_验证签名成功");
helper.SetReturnParameter("return_code", "SUCCESS");
helper.SetReturnParameter("return_msg", dicBack["return_msg"]);
}
}
}
else
{
common_util.WriteLog("Notify_验证签名失败");
helper.SetReturnParameter("return_code", "FAIL");
helper.SetReturnParameter("return_msg", "签名失败");
}
string xmlStr = helper.GetReturnXml();
common_util.WriteLog("Notify_返回xml=" + xmlStr);
Response.ContentType = "text/xml";
Response.Clear();
Response.Write(xmlStr);
Response.End();
}
catch (Exception ex)
{
common_util.WriteLog("Notify_异常了" + ex);
}
}
return Content("OK");