cast_nullable_to_non_nullable

Don't cast a nullable value to a non nullable type.

此规则自 Dart 2.12 版本起可用。

此规则提供 快速修复 。

DON'T cast a nullable value to a non nullable type. This hides a null check and most of the time it is not what is expected.

BAD:

class A {}
class B extends A {}

A? a;
var v = a as B;
var v = a as A;

GOOD:

class A {}
class B extends A {}

A? a;
var v = a! as B;
var v = a!;

要启用 cast_nullable_to_non_nullable 规则，请在你的 analysis_options.yaml 文件中，在 linter > rules 下添加 cast_nullable_to_non_nullable ：

linter:
  rules:
    - cast_nullable_to_non_nullable

除非另有说明，否则本网站上的文档反映的是 Dart 3.6.0。页面最后更新于 2025-02-05。 查看源代码 或 报告问题.