Angular 5服务变量值更新

我无法更新我的角度服务变量值.

我有两个不相关的组件,我想使用服务将更新的对象从一个发送到另一个.但是我无法在服务中更新对象.

第一部分：

import { Soruservice } from '../soru.service';
import { SoruModel,Secenekmodel } from '../soruModel';

@Component({
    SELEctor: 'app-first',templateUrl: './first.component.html',styleUrls: ['./first.component.scss'],providers: [Soruservice]
})
export class FirstComponent implements OnInit {
    public soruLst : [SoruModel];

    constructor( private soruservis : Soruservice ) { }

    ngOnInit(){
        this.soruservis.getirSoruLst().subscribe( veri => {
            this.soruLst = veri as [SoruModel];
        })
    }

    //// MAKE SOME CHANGES ON "soruLst" locally 

    // Send updated 'soruLst' to service 
    updateSoruLst(){
        this.soruservis.updateSoruLst(this.soruLst);
    }

}

我的服务：

import { Injectable } from '@angular/core';
import { SoruModel,Secenekmodel } from './soruModel';
import { http } from '@angular/http';

const MetaJson = 'assets/data/Meta.json';

@Injectable()
export class Soruservice {

    public sorular = [] as [SoruModel];

    constructor( private http:http ) {
        this.sorular = [] as [SoruModel];
    }

    getirSoruLst() {
        return this.http.get(MetaJson)
        .map(yanit => yanit.json())
    }

    updateSoruLst( soruLst : [SoruModel] ) {
             this.sorular = soruLst;
     }

    getSorular() : [SoruModel] {
        return this.sorular;
    }

}

第二部分：

@H_690_5@mport { Soruservice } from '../soru.service'; import { SoruModel,Secenekmodel } from '../soruModel'; @Component({ SELEctor: 'app-second',templateUrl: './second.component.html',styleUrls: ['./second.component.scss'],providers: [Soruservice] }) export class SecondComponent implements OnInit { public soruLst : [SoruModel]; constructor( private soruservis : Soruservice ) { } ngOnInit(){ this.soruLst = this.soruservis.getSorular(); console.log(this.soruLst); } }

这就是我想要做的：

>在FirstComponent中,从服务中获取’soruLst’并在本地更改(成功)
>在FirstComponent中,将更改后的’soruLst’发送到服务(success – updateSoruLst)
>在服务中,更新’sorular’,在’updateSoruLst’中(失败 – 它没有改变,只是在功能范围内改变但我仍然无法读取更新的值).我有问题：

“this.sorular”值不会全局变化.

>在SecondComponent中,从服务中读取更新的’sorular'(失败,仍然无法读取更新的值)

我想我必须改变我的服务,但找不到我必须改变的地方..

如何在服务中更新我的对象？

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FirstComponent } from './first.component';
import { SecondComponent} from './second.component';
import { Soruservice } from '../soru.service';

@NgModule({
   imports: [
      BrowserModule
   ],declarations: [
       AppComponent,FirstComponent,SecondComponent
   ],providers: [
       Soruservice
   ],bootstrap: [AppComponent]
})
export class AppModule {
}