How to get the value from metadata, in Dart?

问题

Dart code:

@Table("users")
class User {}

And the metadata declaration:

class Table {
    final String name;
    const Table(this.name);
}

I can get the metadata @Table by following code:

var classMirror = reflectClass(User);
var metadata = classMirror.metadata;
print(metadata);

Which prints:

[InstanceMirror on Instance of 'Table']

But I don't know how to get the users from it :(

回答1:

You can use InstanceMirror.getField :

metadata.getField(#name);

来源：https://stackoverflow.com/questions/21555598/how-to-get-the-value-from-metadata-in-dart