[英]Flutter The name FutureOr isn't a type, so it can't be used in an as expression
在將 flutter 項目升級到零安全時，它出現了以下錯誤
The name 'FutureOr' isn't a type, so it can't be used in an 'as' expression.
Try changing the name to the name of an existing type, or creating a type with the name 'FutureOr'
看起來 import 缺少import 'dart:async';
FutureOr 是dart:async的一部分
名稱“任務”不是類型，因此不能用作類型參數。 | 顫振與飛鏢
[英]The name 'Task' isn't a type so it can't be used as a type argument. | Flutter & Dart
名稱 'string' 不是類型，不能在 'is' 表達式中使用
[英]The name 'string' isn't a type and can't be used in an 'is' expression
名稱“GeolocationStatus”不是類型，因此不能用作類型參數
[英]The name 'GeolocationStatus' isn't a type so it can't be used as a type argument
錯誤 DART：名稱“x”不是類型，因此不能用作類型參數
[英]ERROR DART: The name 'x' isn't a type so it can't be used as a type argument
名稱“Articles”不是類型，因此不能用作類型參數
[英]The name 'Articles' isn't a type so it can't be used as a type argument
名稱 appstate 不是類型，因此不能用作類型參數
[英]the name appstate isn't a type so it can't be used as a type argument
Flutter forEach() - 錯誤：此表達式的類型為“void”，因此無法使用其值
[英]Flutter forEach() - Error: This expression has a type of 'void' so its value can't be used
Flutter：此表達式的類型為“void”，因此無法使用其值
[英]Flutter: This expression has a type 'void' so its value can't be used
此表達式的類型為“void”，因此無法使用其值。 Flutter
[英]This expression has a type of 'void' so its value can't be used. Flutter
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