ASP.NET常见异常处理示例

• 将指定的年月日转初始化为DateTime新的实例(Nop.Admin.Controllers.OrderController.ParseProductAttributes)

  case AttributeControlType.Datepicker:
  
                          {
  
                              var day = form[controlId + "_day"];
  
                              var month = form[controlId + "_month"];
  
                              var year = form[controlId + "_year"];
  
                              DateTime? selectedDate = null;
  
                              try
  
                              {
  
                                  selectedDate = new DateTime(Int32.Parse(year), Int32.Parse(month), Int32.Parse(day));
  
                              }
  
                              catch { }
  
                              if (selectedDate.HasValue)
  
                              {
  
                                  attributesXml = _productAttributeParser.AddProductAttribute(attributesXml,
  
                                      attribute, selectedDate.Value.ToString("D"));
  
                              }
  
                          }
  
                          break;

• 能否出订单信息(\src\Presentation\Nop.Web\Administration\Controllers\OrderController.cs(1346))

try

            {

                byte[] bytes = _exportManager.ExportOrdersToXlsx(orders);

                return File(bytes, MimeTypes.TextXlsx, "orders.xlsx");

            }

            catch (Exception exc)

            {

                ErrorNotification(exc);

                return RedirectToAction("List");

            }

• 发送HTTP请求(\src\Plugins\Nop.Plugin.ExchangeRate.EcbExchange\EcbExchangeRateProvider.cs(60))

  //get exchange rates to euro from European Central Bank
  
              var request = (HttpWebRequest)WebRequest.Create("http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml");
  
              try
  
              {
  
                  using (var response = request.GetResponse())
  
                  {
  
                      //load XML document
  
                      var document = new XmlDocument();
  
                      document.Load(response.GetResponseStream());
  
                      //add namespaces
  
                      var namespaces = new XmlNamespaceManager(document.NameTable);
  
                      namespaces.AddNamespace("ns", "http://www.ecb.int/vocabulary/2002-08-01/eurofxref");
  
                      namespaces.AddNamespace("gesmes", "http://www.gesmes.org/xml/2002-08-01");
  
                      //get daily rates
  
                      var dailyRates = document.SelectSingleNode("gesmes:Envelope/ns:Cube/ns:Cube", namespaces);
  
                      DateTime updateDate;
  
                      if (!DateTime.TryParseExact(dailyRates.Attributes["time"].Value, "yyyy-MM-dd", null, DateTimeStyles.None, out updateDate))
  
                          updateDate = DateTime.UtcNow;
  
                      foreach (XmlNode currency in dailyRates.ChildNodes)
  
                      {
  
                          //get rate
  
                          decimal currencyRate;
  
                          if (!decimal.TryParse(currency.Attributes["rate"].Value, out currencyRate))
  
                              continue;
  
                          ratesToEuro.Add(new Core.Domain.Directory.ExchangeRate()
  
                          {
  
                              CurrencyCode = currency.Attributes["currency"].Value,
  
                              Rate = currencyRate,
  
                              UpdatedOn = updateDate
  
                          });
  
                      }
  
                  }
  
              }
  
              catch (WebException ex)
  
              {
  
                  _logger.Error("ECB exchange rate provider", ex);
  
              }

• EF操作(\src\Libraries\Nop.Data\EfRepository.cs(182))

  try
  
              {
  
                  if (entities == null)
  
                      throw new ArgumentNullException("entities");
  
                  foreach (var entity in entities)
  
                      this.Entities.Remove(entity);
  
                  this._context.SaveChanges();
  
              }
  
              catch (DbEntityValidationException dbEx)
  
              {
  
                  throw new Exception(GetFullErrorText(dbEx), dbEx);
  
              }

• \src\Libraries\Nop.Core\WebHelper.cs(46)

          protected virtual Boolean IsRequestAvailable(HttpContextBase httpContext)
  
          {
  
              if (httpContext == null)
  
                  return false;
  
              try
  
              {
  
                  if (httpContext.Request == null)
  
                      return false;
  
              }
  
              catch (HttpException)
  
              {
  
                  return false;
  
              }
  
              return true;
  
          }

• \src\Libraries\Nop.Core\Plugins\PluginManager.cs(434)

  try
  
                  {
  
                      File.Copy(plug.FullName, shadowCopiedPlug.FullName, true);
  
                  }
  
                  catch (IOException)
  
                  {
  
                      Debug.WriteLine(shadowCopiedPlug.FullName + " is locked, attempting to rename");
  
                      //this occurs when the files are locked,
  
                      //for some reason devenv locks plugin files some times and for another crazy reason you are allowed to rename them
  
                      //which releases the lock, so that it what we are doing here, once it's renamed, we can re-shadow copy
  
                      try
  
                      {
  
                          var oldFile = shadowCopiedPlug.FullName + Guid.NewGuid().ToString("N") + ".old";
  
                          File.Move(shadowCopiedPlug.FullName, oldFile);
  
                      }
  
                      catch (IOException exc)
  
                      {
  
                          throw new IOException(shadowCopiedPlug.FullName + " rename failed, cannot initialize plugin", exc);
  
                      }
  
                      //ok, we've made it this far, now retry the shadow copy
  
                      File.Copy(plug.FullName, shadowCopiedPlug.FullName, true);
  
                  }