non_type_in_catch_clause

The name '{0}' isn't a type and can't be used in an on-catch clause.

The analyzer produces this diagnostic when the identifier following the on in a catch clause is defined to be something other than a type.

The following code produces this diagnostic because f is a function, not a type:

void f() {
  try {
    // ...
  } on f {
    // ...
  }
}

Change the name to the type of object that should be caught:

void f() {
  try {
    // ...
  } on FormatException {
    // ...
  }
}

除非另有说明，文档之所提及适用于 Dart 3.7.3 版本，本页面最后更新时间: 2025-05-08。 查看文档源码 或者 报告页面问题。