Expression has changed after it was checked. PrevIoUs value: ‘true’. Current value: ‘false’

所以我想手动运行另一轮变化检测.找到有关使用ApplicationRef.tick()但当前收到错误的信息

ERROR in [default] C:\development\SolarUI11\src\app\update\update.component.ts:8
:11
Argument of type ‘{ selector: string; styles: any[]; template: any; providers: (
typeof ApplicationRef | typeof Date…’ is not assignable to parameter of type ‘
Component’.
Types of property ‘providers’ are incompatible.
Type ‘(typeof ApplicationRef | typeof DatePipe)[]’ is not assignable to type
‘Provider[]’.
Type ‘typeof ApplicationRef | typeof DatePipe’ is not assignable to type ‘
Provider’.
Type ‘typeof ApplicationRef’ is not assignable to type ‘Provider’.
Type ‘typeof ApplicationRef’ is not assignable to type ‘FactoryProvide
r’.
Property ‘provide’ is missing in type ‘typeof ApplicationRef’.`

我想我只是坚持实现这个的语法,自己找不到足够的信息才能使用它.

打字稿：

import { Component,Input,ApplicationRef } from '@angular/core';
import { FormGroup,FormBuilder,Validators } from '@angular/forms';
import {NgbDateStruct} from '@ng-bootstrap/ng-bootstrap';
import {DatePipe} from "@angular/common";
import { DataTable } from '../data/datatable';
import { DPS } from '../data/datainfo.ts';

@Component({
  selector: 'update-validation',styleUrls: ['../app.component.css'],templateUrl: 'update.component.html',providers: [DatePipe,ApplicationRef]
})
export class UpdateComponent {
  @Input() receivedRow:DataTable;
   public dt: NgbDateStruct;
   public dt2: NgbDateStruct;
   public startCheck: boolean = false;
   public endCheck: boolean = false;
   updateForm : FormGroup;

   constructor(fb: FormBuilder,private datePipe: DatePipe,private appref: ApplicationRef){
     this.updateForm = fb.group({
      'dataPoint' : [null,Validators.required],'ICCP' : [null,'startDate' : [null,'endDate' : [null,Validators.required]
      },{validator: this.endDateAfterOrEqualValidator})
   }

 ngOnChanges(){
if(this.receivedRow){
  this.updateForm.controls['dataPoint'].setValue(this.receivedRow.tDataPoint);
  this.updateForm.controls['ICCP'].setValue(this.receivedRow.tICCP);
  this.updateForm.controls['startDate'].setValue(this.receivedRow.tStartDate);
  this.updateForm.controls['endDate'].setValue(this.receivedRow.tEndDate);
  }
}

  resetForm(){
    location.reload();
    //this.updateForm.reset();
  }

  submitForm(value: any,originalRow: any){
    var dataPointID = originalRow.receivedRow.tDataPoint;
    for (let entry in DPS) {
      if (DPS[entry].tDataPoint === dataPointID) {
        DPS[entry].tDataPoint = String((<HTMLInputElement>document.getElementById("dataPoint")).value);
        DPS[entry].tICCP = String((<HTMLInputElement>document.getElementById("ICCP")).value);
        DPS[entry].tStartDate = String((<HTMLInputElement>document.getElementById("startDate")).value);
        DPS[entry].tEndDate = String((<HTMLInputElement>document.getElementById("endDate")).value);
      }
    }
  }

  getStartDate(){
    var month = this.receivedRow.tStartDate.substring(0,2);
    var day = this.receivedRow.tStartDate.substring(3,5);
    var year = this.receivedRow.tStartDate.substring(6,10);
    var dateToUse = new Date(Number(year),Number(month)-1,Number(day));
    let timestamp = this['startDate'] != null ? new Date(this['startDate'].year,this['startDate'].month-1,this['startDate'].day).getTime() : dateToUse.getTime();
    this.updateForm.controls['startDate'].setValue(this.datePipe.transform(timestamp,'MM/dd/yyyy'));
    this.appref.tick();
  }

  getEndDate(){
    var month = this.receivedRow.tEndDate.substring(0,2);
    var day = this.receivedRow.tEndDate.substring(3,5);
    var year = this.receivedRow.tEndDate.substring(6,Number(day));
    let timestamp = this['endDate'] != null ? new Date(this['endDate'].year,this['endDate'].month-1,this['endDate'].day).getTime() : dateToUse.getTime();
    this.updateForm.controls['endDate'].setValue(this.datePipe.transform(timestamp,'MM/dd/yyyy'));
    this.appref.tick();
  }

  public showDatePick(selector):void {
     if(selector === 0) {
       this.startCheck = !this.startCheck
     } else {
       this.endCheck = !this.endCheck;
     }
  }

  endDateAfterOrEqualValidator(formGroup): any {
    var startDateTimestamp,endDateTimestamp;
    for(var controlName in formGroup.controls) {
      if (controlName.indexOf("startDate") !== -1) {
       startDateTimestamp = Date.parse(formGroup.controls[controlName].value);
      }
      if (controlName.indexOf("endDate") !== -1) {
        endDateTimestamp = Date.parse(formGroup.controls[controlName].value);
      }
    }
    return (endDateTimestamp < startDateTimestamp) ? { endDateLessThanStartDate: true } : null;
  }
}