错误TS2345：“对象”类型的参数无法分配给类型的参数

Question

我正在使用angular 2，但出现一个奇怪的错误：

error TS2345: Argument of type 'Object' is not assignable to parameter of type

我在命令行中显示如下：

[0] app/category-details.component.ts(40,39): error TS2345: Argument of type 'Object' is not assignable to parameter of type '{ CategoryID: number; }'.
[0]   Property 'CategoryID' is missing in type 'Object'.
[0] app/category-details.component.ts(45,39): error TS2345: Argument of type 'Object' is not assignable to parameter of type '{ CategoryID: number; }'.

这是代码：

export class CategoryDetailComponent implements OnInit {

    @Input() public category: Object;

    private view: Observable<GridDataResult>;
    private skip: number = 0;

    constructor(private service: ProductsService) { }

    public ngOnInit(): void {
        this.view = this.service;

        this.service.queryForCategory(this.category, { skip: this.skip, take: 5 });
    }

    protected pageChange({ skip, take }: PageChangeEvent): void {
        this.skip = skip;
        this.service.queryForCategory(this.category, { skip, take });
    }
}

它向我显示了以下错误：

this.service.queryForCategory(this.category, { skip: this.skip, take: 5 });

this.service.queryForCategory(this.category, { skip, take });

我该如何解决这个错误？

谢谢！

Answer 1

服务方法this.service.queryForCategory(this.category, { skip, take }); 期望第一个参数的类型为{ CategoryID: number; } { CategoryID: number; } ，同时传递this.category ，它被注释为Object 。 您可以为类别创建一个接口，以便queryForCategory和@Input() public category: ICategory; 正在使用它。

// interface.ts
export interface ICategory {
    CategoryID: number;
}

// service declaration
queryForCategory(category: ICategory, options)


// input property annotation
 @Input() public category: ICategory;