Flutter Flatter BLoC:mapEventToState的全局异常处理程序

我使用felangel的bloc库。我使用mapEventToState方法中的存储库获取数据。如果存储库引发异常，我希望在全局异常处理程序中捕获它

@override
Stream<MyState> mapEventToState(Event event) async* {
  if (event is MyEvent) {
    try {
      var data = await repository.fetchData();
      yield MyState(data);
    } catch (e) {
      //There may be many exceptions
    }
  }
}

@覆盖
流mapEventToState（事件）异步*{
如果（事件为MyEvent）{
试一试{
var data=await repository.fetchData（）；
产量状态（数据）；
}捕获（e）{
//可能有很多例外
}
}
}

---

有没有办法在不使用try-catch块的情况下捕获异常？最佳做法是什么？

您可以编写一个用于管理错误的util。我为此写了一些东西。这对你来说可能是个好主意

static String handleError(Error error) {
        String errorDescription = "";
        if (/*error is SomethingError*/) {
          switch (error.type) {
            case ErrorType.CANCEL:
              errorDescription = "ErrorType.CANCEL";
              break;
            case ErrorType.CONNECT_TIMEOUT:
              errorDescription = "ErrorType.CONNECT_TIMEOUT";
              break;
            case ErrorType.DEFAULT:
              errorDescription = "ErrorType.DEFAULT";
              break;
            case ErrorType.RECEIVE_TIMEOUT:
              errorDescription = "ErrorType.RECEIVE_TIMEOUT";
              break;
            case ErrorType.RESPONSE:
              switch (error.response.toString()) {
                case "usernamePasswordFail":
                  errorDescription = "usernamePasswordFail";
                  break;
                default:
                  errorDescription = "errorDescription";
 }, ${error.response.data ?? ''}";
                  break;
              }
              break;
            case ErrorType.SEND_TIMEOUT:
              errorDescription = "ErrorType.SEND_TIMEOUT";
              break;
          }
        } else {
          errorDescription = "somethingElseError";
        }
        return errorDescription;
      }

---

您可以编写一个用于管理错误的util。我为此写了一些东西。这对你来说可能是个好主意

static String handleError(Error error) {
        String errorDescription = "";
        if (/*error is SomethingError*/) {
          switch (error.type) {
            case ErrorType.CANCEL:
              errorDescription = "ErrorType.CANCEL";
              break;
            case ErrorType.CONNECT_TIMEOUT:
              errorDescription = "ErrorType.CONNECT_TIMEOUT";
              break;
            case ErrorType.DEFAULT:
              errorDescription = "ErrorType.DEFAULT";
              break;
            case ErrorType.RECEIVE_TIMEOUT:
              errorDescription = "ErrorType.RECEIVE_TIMEOUT";
              break;
            case ErrorType.RESPONSE:
              switch (error.response.toString()) {
                case "usernamePasswordFail":
                  errorDescription = "usernamePasswordFail";
                  break;
                default:
                  errorDescription = "errorDescription";
 }, ${error.response.data ?? ''}";
                  break;
              }
              break;
            case ErrorType.SEND_TIMEOUT:
              errorDescription = "ErrorType.SEND_TIMEOUT";
              break;
          }
        } else {
          errorDescription = "somethingElseError";
        }
        return errorDescription;
      }