我会使用带有选择策略的材料日期选择器
有时候我不应该使用选择策略。
但是就像它是在提供者数组中示例化的一样。我找不到一种方法来有条件地设置它。

import { Component, Injectable, Input } from '@angular/core';
import { DateAdapter } from '@angular/material/core';
import {
  MatDateRangeSelectionStrategy,
  DateRange,
  MAT_DATE_RANGE_SELECTION_STRATEGY,
} from '@angular/material/datepicker';

@Injectable()
export class FiveDayRangeSelectionStrategy<D>
  implements MatDateRangeSelectionStrategy<D>
{
  constructor(private _dateAdapter: DateAdapter<D>) {}

  selectionFinished(date: D | null): DateRange<D> {
    return this._createFiveDayRange(date);
  }

  createPreview(activeDate: D | null): DateRange<D> {
    return this._createFiveDayRange(activeDate);
  }

  private _createFiveDayRange(date: D | null): DateRange<D> {
    if (date) {
      const start = this._dateAdapter.addCalendarDays(date, -2);
      const end = this._dateAdapter.addCalendarDays(date, 2);
      return new DateRange<D>(start, end);
    }

    return new DateRange<D>(null, null);
  }
}

/** @title Date range picker with custom a selection strategy */
@Component({
  selector: 'app-date-range-picker-selection-strategy',
  templateUrl: 'date-range-picker-selection-strategy-example.html',
  providers: [
    {
      provide: MAT_DATE_RANGE_SELECTION_STRATEGY,
      useClass: FiveDayRangeSelectionStrategy,
    },
  ],
})
export class DateRangePickerSelectionStrategyExample {
  @Input() set selectionStrategy(value:boolean) {
    if(value) {
      //// Sould provide selection strategy
    }
    else {
     //// sould not
    }
  };
}

应用程序.组件.html

<p><b>Sould use selection strategy</b></p>
<app-date-range-picker-selection-strategy [selectionStrategy]="true"></app-date-range-picker-selection-strategy>
<mat-divider></mat-divider>
<p><b>Sould <span [ngStyle]="{'color':'red'}">not</span> use selection strategy</b></p>
<app-date-range-picker-selection-strategy [selectionStrategy]="false"></app-date-range-picker-selection-strategy>

实际上，我创建了两个日期选择器组件：一个有选择策略，一个没有。
我想知道我如何才能在两个用例中只使用一个组件？
我读了很多关于useValue/useFactory/useClass的书，但我没有找到解决方案。
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