传递角服务类和基础类

Question

我有下面的类：

export class CellLayer extends BaseLayer { 

    constructor(name: string, type: LayerType, private mapService: MapService) { 
     super(name, type, mapService); 
    } 
} 

和相应的抽象类：

export abstract class BaseLayer implements ILayer { 

    private _name: string; 
    private _type: LayerType; 

    constructor(name: string, type: LayerType, private mapService: MapService) { 
     this._name = name; 
     this._type = type; 
    } 
} 

全局MapService对象应传递给这两个类。

不过，我现在收到以下错误：

Types have separate declarations of a private property 'mapService'. (6,14): Class 'CellLayer' incorrectly extends base class 'BaseLayer'.

Answer 1

使其受到保护。

Private表示属性对于当前类是私有的，因此子组件不能覆盖它，也不能定义它。

export abstract class BaseLayer implements ILayer { 

    private _name: string; 
    private _type: LayerType; 

    constructor(name: string, type: LayerType, protected mapService: MapService) { 
     this._name = name; 
     this._type = type; 
    } 
} 
export class CellLayer extends BaseLayer { 

    constructor(name: string, type: LayerType, protected mapService: MapService) { 
     super(name, type, mapService); 
    } 
} 

Answer 2

从CellLayer构造函数删除private，并使其protected在BaseLayer类。通过这种方式，您可以访问CellLayer类中的BaseLayer的mapService成员。

export abstract class BaseLayer implements ILayer { 

    private _name: string; 
    private _type: LayerType; 

    constructor(name: string, type: LayerType, protected mapService: MapService) { 
      this._name = name; 
      this._type = type; 
    } 
} 

export class CellLayer extends BaseLayer { 

    constructor(name: string, type: LayerType, mapService: MapService) { 
     super(name, type, mapService); 
    } 
}