我想拥有一个继承自Dart另一个类的某些属性的类。最好的方法是什么？
这是我的父母班：
class Photo {
final String id;
final String owner, server, secret, title;
final int farm, isfamily, ispublic, isfriend;
final String url;
Photo(
{this.id,
this.owner,
this.secret,
this.server,
this.farm,
this.title,
this.ispublic,
this.isfriend,
this.isfamily,
this.url});
factory Photo.fromJson(Map<String, dynamic> parsedJson) {
return new Photo(
id: parsedJson['id'],
owner: parsedJson['owner'],
secret: parsedJson['secret'],
server: parsedJson['server'],
farm: parsedJson['farm'],
title: parsedJson['title'],
ispublic: parsedJson['ispublic'],
isfriend: parsedJson['isfriend'],
isfamily: parsedJson['isfamily'],
url: parsedJson['url_m']);
}
}
这是我要创建的子类：
class gPhoto : Photo //inherits Photo
{
string ownername;
string dateadded;
gPhoto(
{this.ownername,
this.dateadded
});
factory gPhoto.fromJson(Map<String, dynamic> parsedJson) {
return new Photo(
ownername: parsedJson['ownername'],
dateadded: parsedJson['dateadded'']);
}
这样行吗？Photo类的工厂将与我的新类一起使用，还是我必须为gPhoto创建一个单独的类才能映射json？
您需要检查dart语法，该语法与C＃等:用于继承的语言有些不同。
这是您自己执行的操作：
class Photo {
final String id;
final String owner, server, secret, title;
final int farm, isfamily, ispublic, isfriend;
final String url;
Photo(
{this.id,
this.owner,
this.secret,
this.server,
this.farm,
this.title,
this.ispublic,
this.isfriend,
this.isfamily,
this.url});
factory Photo.fromJson(Map<String, dynamic> parsedJson) {
return new Photo(
id: parsedJson['id'],
owner: parsedJson['owner'],
secret: parsedJson['secret'],
server: parsedJson['server'],
farm: parsedJson['farm'],
title: parsedJson['title'],
ispublic: parsedJson['ispublic'],
isfriend: parsedJson['isfriend'],
isfamily: parsedJson['isfamily'],
url: parsedJson['url_m']);
}
}
class gPhoto extends Photo {
final String ownername;
final String dateadded;
gPhoto(
{id,
owner,
secret,
server,
farm,
title,
ispublic,
isfriend,
isfamily,
url,
this.ownername,
this.dateadded})
: super(
id: id,
owner: owner,
secret: secret,
server: server,
farm: farm,
title: title,
ispublic: ispublic,
isfamily: isfamily,
url: url);
factory gPhoto.fromJson(Map<String, dynamic> parsedJson) {
final photo = Photo.fromJson(parsedJson);
final ownername = parsedJson['ownername'];
final dateadded = parsedJson['dateadded'];
return gPhoto(
dateadded: dateadded,
ownername: ownername,
farm: photo.farm,
id: photo.id,
isfamily: photo.isfamily,
isfriend: photo.isfriend,
ispublic: photo.ispublic,
owner: photo.owner,
secret: photo.secret,
server: photo.server,
title: photo.title,
url: photo.url,
);
}
}
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