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我正在尝试在 formarray 中实现 formarray 但它不起作用，下面也尝试过但不起作用。

当FormArray嵌套在另一个FormArray中时如何获取FormArrayName？

有人可以帮助我在下面的代码中我做错了什么

HTML

<div [formGroup]="MainFormGroup" class="custom-auto-complete">
  <mat-radio-group matInput formControlName="Applies">
    <mat-radio-button *ngFor="let applie of applies" [value]="applie.id">{{applie.value}}</mat-radio-button>
  </mat-radio-group>           
  <div formArrayName="FormArrayOne">
    <div *ngFor="let mains of MainFormGroup.get('FormArrayOne')['controls']; let i=index">
      <div [formGroupName]="i">
        <mat-icon *ngIf="MainFormGroup.get('FormArrayOne').length > 1" (click)="removeMarket(i)">remove_circle</mat-icon>
        <mat-icon (click)="addOne()"> add_circle</mat-icon>
        <mat-form-field>
          <input matInput formControlName="OneField" value="">
        </mat-form-field>
        <div formArrayName="FormArrayTwo">
          <div *ngFor="let Market of MainFormGroup.get('FormArrayTwo')['controls']; let j=index" >
            <div [formGroupName]="j">            
              <mat-form-field class="formfieldsControl">
                <input matInput formControlName="Destination">
              </mat-form-field>
            </div>
          </div>
        </div>         
      </div>
    </div>
  </div>    
</div>

TS

public ngOnInit() {
  this.MaintFormGroup = this._fb.group({
    Applies : …