Exception 如何捕捉颤振中异步函数的异常？

我使用许多API与服务器通信，并希望处理来自此调用的意外异常。但是，它根本无法捕获异常。如何处理

if(event is RandomChatEventMatchStart){
  yield RandomChatState.loading();
  try {
    chatRoomID = await _api.getRoomID();
    if(chatRoomID.isEmpty){
      chatRoomID = await _api.makeChatRoom();
      yield RandomChatState.madeChatRoom(chatRoomID);
    } else {
      await _api.enterChatRoom(chatRoomID);
      yield RandomChatState.matchSucceeded();
    }
  } catch(exception) {
    yield RandomChatState.apiFailed(exception.toString());
  }
}

E/flatter（12376）：PlatformException（错误，无效文档引用。文档引用必须有偶数个段，但消息有1个空段）E/flatter（12376）：#0 StandardMethodCodec.decodeEnvelope包：flatter/../services/message_codecs。dart:564 E/flatter（12376）：
#1 MethodChannel.invokeMethod包：flatter/../services/platform\u channel.dart:292 E/flatter（12376）：E/flatter（12376）：\2 DocumentReference.snapshots…\\src\文件参考。dart:126 E/颤振（12376）：\3
_Runguard（dart:async/stream\u controller.dart:805:24）E/Flatter（12376）：#4(BroadcastStreamController.)订阅（dart:async/broadcast\u stream\u controller.dart:213:7）E/Flatter（12376）：
#5 _ControllerStream._createSubscription（dart:async/stream_controller.dart:818:19）E/flift（12376）：#6
_StreamImpl.listen（dart:async/stream\u impl.dart:472:9）E/flatter（12376）：#7\u StreamBuilderBaseState.\u订阅包：flatter/../widgets/async.dart:135 E/flatter（12376）：#8
_StreamBuilderBaseState.didUpdateWidget包：flatter/../widgets/async.dart:120 E/flatter（12376）：#9 stateflement.update包：flatter/../widgets/framework.dart:3863 E/flatter（12376）：#10 Element.updateChild

如果您使用的是

async

/

wait

，那么您可以使用

try

/

catch

@GünterZöchbauer首先，我是这样想的，但它无法捕获异常！导致此异常的代码行。它似乎来自

StreamBuilder

，而不是您发布的代码。与此代码相关

E/flutter (12376): PlatformException(error, Invalid document reference. Document references must have an even number of segments, but messages has 1, null) E/flutter (12376): #0      StandardMethodCodec.decodeEnvelope  package:flutter/…/services/message_codecs.dart:564 E/flutter (12376):
#1      MethodChannel.invokeMethod  package:flutter/…/services/platform_channel.dart:292 E/flutter (12376): <asynchronous suspension> E/flutter (12376): #2      DocumentReference.snapshots.<anonymous closure>  ..\…\src\document_reference.dart:126 E/flutter (12376): #3     
_runGuarded (dart:async/stream_controller.dart:805:24) E/flutter (12376): #4      _BroadcastStreamController._subscribe (dart:async/broadcast_stream_controller.dart:213:7) E/flutter (12376):
#5      _ControllerStream._createSubscription (dart:async/stream_controller.dart:818:19) E/flutter (12376): #6     
_StreamImpl.listen (dart:async/stream_impl.dart:472:9) E/flutter (12376): #7      _StreamBuilderBaseState._subscribe  package:flutter/…/widgets/async.dart:135 E/flutter (12376): #8     
_StreamBuilderBaseState.didUpdateWidget  package:flutter/…/widgets/async.dart:120 E/flutter (12376): #9      StatefulElement.update  package:flutter/…/widgets/framework.dart:3863 E/flutter (12376): #10     Element.updateChild