如何将HTML中的选定值mat-select放入ts文件?

我正在尝试将所选值从HTML获取到ts文件中。下面是使用角度材料标记的HTML代码

      <mat-form-field [style.visibility]="visibility" >
              <mat-label>Apps</mat-label>
              <mat-select #selectedApp (change)='fetchTableData($event)'>
                    <mat-option *ngFor="let apps of appsList$" [value]="apps.appName">{{apps.appName}}</mat-option>
                    <mat-option [value]="all">All</mat-option>
              </mat-select>
        </mat-form-field>

.ts代码

     @ViewChild('selectedApp') selectedApp;

     ngOnInit() {             
             return this.testcaseService.getAll()
         .subscribe(apps => this.appsList$ = apps);

      }

     fetchTableData(event: any){                  

        console.log("Selected App: "+this.selectedApp.Selected);
      } 

我不确定我在这里做错了什么。有人能帮我吗?

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