Task Asnyc 异常问题
/// <summary> /// async 异常捕获问题 /// </summary> /// <param name="context"></param> /// <returns></returns> static async Task<string> TestException(string context) { return string.Format("【{0}】 长度:【{1}】",context,context.Length); } /// <summary> /// 该方法无法获取异常 /// </summary> static void Test1() { try { //产生异常 无法捕获异常 TestException(null).ContinueWith(r =>{ Console.WriteLine(r.Result); }); } catch (Exception ex) { throw; } } /// <summary> /// 不能报异常（async与await一起使用） /// </summary> /// <returns></returns> static async Task Test2() { string result = await TestException(null); string test = result; }
Http async / await 方式请求实例：
public static async Task<string> HttpGet(string Url) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url); request.Method = "GET"; request.ContentType = "text/html;charset=UTF-8"; using (var response =await request.GetResponseAsync()) { Stream myResponseStream = response.GetResponseStream(); StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8); string retString = myStreamReader.ReadToEnd(); return retString; } } public static async Task<string> HttpPostAsync(string url, string postData) { try { byte[] byteArray = Encoding.UTF8.GetBytes(postData); HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; request.ContentType = "application/json"; request.ContentLength = byteArray.Length; using (Stream myRequestStream = await request.GetRequestStreamAsync()) { myRequestStream.Write(byteArray, 0, byteArray.Length); WebResponse response = request.GetResponse(); StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")); return myStreamReader.ReadToEnd(); } } catch (Exception ex) { Logger.Info(ex); return string.Empty; } } public static async Task<string> HttpPostAsync(string url, Dictionary<string,string> paramList) { try { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); StringBuilder sb = new StringBuilder(); foreach (var item in paramList) { sb.Append(item.Key + "=" + item.Value + "&"); } string paramData = sb.ToString().Trim('&'); byte[] data = System.Text.Encoding.UTF8.GetBytes(paramData); request.Method = "post"; //这句不能少 不难post请求 得不到对应的响应结果 request.ContentType = "application/x-www-form-urlencoded"; using (Stream myRequestStream = await request.GetRequestStreamAsync()) { myRequestStream.Write(data, 0, data.Length); WebResponse response = request.GetResponse(); StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding("utf-8")); return myStreamReader.ReadToEnd(); } } catch (Exception ex) { Logger.Info(ex); return string.Empty; } }
/// <summary> /// PPTV点卡充值 /// </summary> /// <param name="mobie">手机号</param> /// <param name="cardnumber">点卡卡密</param> /// <returns></returns> public async Task<string> ExchangePPTVCard(string mobie, string cardnumber) { string agent = "lemon_act"; string agentkey = "HF0abDEc"; string username = mobie; //aesyhhxw72453525 月卡 //hnscpyau66772763 半年卡 //mwusrbdu45743377 年卡 //string cardnumber = "hnscpyau66772763"; string urlEncodeUsername = StringHelper.UrlEncode(username); string sign = StringHelper.MD5(StringHelper.UrlEncode(string.Format("{0}&{1}&{2}",username,cardnumber,agentkey))); Dictionary<string, string> paramList = new Dictionary<string, string>(); paramList.Add("username", urlEncodeUsername); paramList.Add("cardnumber", cardnumber); paramList.Add("agent", agent); paramList.Add("sign", sign); string url = "https://api.vip.pptv.com/ppcard/exchange"; string result = await HttpHelper.HttpPostAsync(url, paramList); UserPPTVCardExchangeResultModel exchangeResult = JsonConvert.DeserializeObject<UserPPTVCardExchangeResultModel>(result); return result; }
/// <summary> /// 充值点卡 /// </summary> /// <param name="mobile">手机号(手机号必须注册)</param> /// <param name="cardnumber">点卡卡密</param> /// <returns></returns> [HttpGet, Route("ExchangeCard")] public async Task<Result<bool>> ExchangeCard(string mobile,string cardnumber) { Result<bool> result = new Result<bool>(); try { string secretKey = Request.Headers.GetValues("SecretKey").FirstOrDefault(); ChannelsService channelservice = new ChannelsService(); int channelId = channelservice.GetChannerIdBySecretKey(secretKey); UsersService userService = new UsersService(); //1.判断手机是否存在 bool isExist = userService.IsRegisterPPTVByMobile(mobile, channelId); result.ReturnCode = StateCode.Success; if (!isExist) { Logger.Warn(string.Format("【0】手机号尚未注册",mobile)); result.Data = false; result.ReturnMsg = "该手机尚未注册"; return result; } //2.判断该点卡是否可以使用 bool isEnable = await PPTVCardInfo(mobile,cardnumber); if (!isEnable) { Logger.Warn(string.Format("【0】点卡卡密已经被使用", cardnumber)); result.Data = false; result.ReturnMsg = "该点卡卡密已经被使用"; return result; } //3.充值PPTV点卡 bool isChange = await ExchangePPTVCard(mobile, cardnumber); if (!isChange) { result.Data = false; result.ReturnMsg = "该点卡卡密已经被使用"; return result; } result.Data = userService.ExchangePPTVCard(cardnumber); if (result.Data) { result.ReturnMsg = "充值点卡成功"; } else { result.ReturnMsg = "充值点卡失败"; } } catch (Exception ex) { result.ReturnMsg = "服务器内部发生异常"; Logger.Error("UsersController[ExchangeCard]", ex); } return result; }
使用Task.Run(()=>{})方式执行
/// <summary> /// 更新订单状态 /// </summary> /// <param name="consumptionId">订单ID</param> /// <param name="totalFee">总费用</param> /// <param name="status">状态</param> /// <returns></returns> public async Task<bool> CheckUserConsumptionStatus(Guid consumptionId, string buyerEmail, decimal totalFee, int status) { return await Task.Run(() => { //TODO return true; }); }
