使用自定义管道基于两个输入的Angular2过滤器表

我有一个表，其中两列是用字符串表示的日期。我想基于两个输入（由两个ngb-datepickers填充，默认值为null）来过滤表。使用自定义管道，我目前遇到控制台错误Cannot read property '0' of undefined，并且我的表未呈现到页面，所有按钮均不起作用，并且表单验证不起作用。我将自定义管道导入到app.module.ts中的声明中。包含最少的代码来显示整个范围，如果有什么令人困惑的地方或包含更多内容，请告诉我。

mainpage.component.html：

<div>
  <label>Start Date:</label>
  <input type="text" [(ngModel)]="startDateValue">
</div>
  <label>End Date:</label>
  <input type="text" [(ngModel)]="endDateValue">
</div>
//'let idx=index' and 'let even=even' are used to change color of the rows but I took out that code. The 'onClick' function just takes the row and uses an EventEmitter to output it.
<tr *ngFor="let dPoint of theData | searchDates:startDateValue:endDateValue; let idx=index; let even=even;" (click)="onClick(dPoint, idx)">
  <td>{{dPoint.tDataPoint}}</td>
  <td>{{dPoint.tICCP}}</td>
  <td>{{dPoint.tStartDate}}</td>
  <td>{{dPoint.tEndDate}}</td>
</tr>

mainpage.component.ts：

@Component({
  selector: 'main-page',
  styleUrls: ['../app.component.css'],
  templateUrl: 'mainpage.component.html',
  providers: [DataTableService, DatePipe]
})

export class MainPageComponent implements OnInit {
  secondForm : FormGroup;
  theData:DataTable[] = [];

  constructor(fb: FormBuilder, private datePipe: DatePipe, private dataService: DataTableService, private cdRef:ChangeDetectorRef){
    this.secondForm = fb.group({
      'startDate' : [null, Validators.required],
      'endDate' : [null, Validators.required]
    }, {validator: this.endDateAfterOrEqualValidator})
  }

  getTable(): void {
    this.dataService.getTable().then(theData => this.theData = theData);
    this.cdRef.detectChanges();
  }
}

search-pipe.ts：

import { Pipe, PipeTransform } from "@angular/core";

@Pipe({
  name: "searchDates"
})

//if I comment out the code inside the transform function, I get no console errors, all functionality previously mentioned that stopped working now does again, but my entire table still does not render
export class SearchPipe implements PipeTransform {
  transform(value, args?){
    let firstDate = new Date(args[0]);
    let secondDate = new Date(args[1]);
    //let [minDate, maxDate] = args;
    return value.filter(row => {
      return row.tStartDate >= firstDate && row.tEndDate <= secondDate;
    });
  }
}

我认为我的问题是我的转换功能中的语法/功能不正确。我已经看到了类似的问题，像这样的，但我似乎无法格式化为我需要和我太熟悉Angular2，尤其是管道。