Angular 5.2错误：无法将类型'Observable <something []>转换为'Observable <somethingelse>'

Question

使用Angular 5.2，我收到此resharper打字稿错误： 无法转换类型'Observable＆lt; IPartBundle []＆gt;输入'Observable＆lt; IOrderHead＆gt;'

public orderHead$: Observable<IOrderHead>;

ngOnInit() {

    this.orderHead$ = this.route.paramMap.switchMap((params: ParamMap) => {
        this.partBundle$ = this.orderShipService.getPartBundleObservable(this.orderShipDetails$, this.cartons$, this.licensePlate, this.orderLine);
        return this.order.getOrderHeadObservable(+params.get('orderNumber'));
    }).share();
}

Answer 1

似乎Resharper想要包含在share方法中的类型，就像这样。

this.orderHead$ = this.route.paramMap.switchMap((params: ParamMap) => {
    this.partBundle$ = 
this.orderShipService.getPartBundleObservable(this.orderShipDetails$, 
this.cartons$, this.licensePlate, this.orderLine);
    return this.order.getOrderHeadObservable(+params.get('orderNumber'));
}).share<IOrderHead>();

然后，resharper错误就消失了。