angular - Angular 5将Enum int转换为字符串

我想将我的枚举显示为字符串，但将其显示为数字。

我正在从Web服务接收json对象，并将其映射到我的Typescript对象

getProperties(): Observable<Property[]> {
    return this.http.get<Property[]>(this.getallagentsproperties + '1');
}

export enum LetType {
    Notspecified = 0,
    LongTerm = 1,
    ShortTerm = 2,
    Commercial = 4
}

export class Property {
    ...other stuff...
    letType: LetType;
    ...other stuff...
}

我的组件会进行调用并将其添加到相关属性中

import { Component, OnInit } from '@angular/core';
import { Property } from './Property';
import { PropertyService } from '../properties.service';

@Component({
  selector: 'app-properties',
  templateUrl: './properties.component.html',
})

export class PropertiesComponent implements OnInit {
  properties: Property[];
  constructor(private propertyService: PropertyService) { }
  ngOnInit() {
    this.getProperties()
  }
  getProperties(): void {
    this.propertyService.getProperties()
        .subscribe(p => this.properties = p);
  }
}

当我在模板中显示{{property.letType}}时，将显示:
4我希望它显示商业广告

我尝试遵循在添加的模板中找到here的答案

{{LetType[property.letType]}}

在我的Componant中，我添加了

LetType = this.LetType;

但我总是在控制台中收到以下错误



我究竟做错了什么？

最佳答案

您无需在此处创建管道。这是我的答案。

let-type.enum.ts

export enum LetType{
  Type1 = 1,
  Type2 = 2,
  Type3 = 3,
  Type4 = 4
}

property.model.ts

export interface Property{
   ...other stuff...
   letType: LetType;
   ...other stuff...
}

properties.component.ts

import { Component, OnInit } from '@angular/core';
import { Property} from './property.model';
import { LetType} from './let-type.enum';
import { PropertyService } from '../properties.service';

@Component({
   selector: 'app-properties',
   templateUrl: './properties.component.html',
})
export class PropertiesComponent implements OnInit {

  properties: Property[] = [];
  LetType = LetType;

  constructor(private propertyService: PropertyService) { }

  ngOnInit() {
     this.getProperties();
  }

  getProperties() {
    this.propertyService.getProperties().subscribe(result => {
         this.properties = result
    });
  }
}

然后在你的HTML

<ng-container matColumnDef="columnName">
   <th mat-header-cell *matHeaderCellDef >Types</th>
   <td  mat-cell *matCellDef="let element">{{LetType[element.letType]}}</td>
</ng-container>