Question

当我从我的自定义错误处理程序得到的每一个Error都从诺言中抛出时，它的类型就会丢失

import { HttpErrorResponse } from "@angular/common/http";
import { ErrorHandler, Injectable, Injector, NgZone } from "@angular/core";
import { MatSnackBar } from "@angular/material";

@Injectable()
export class GlobalErrorHandler implements ErrorHandler {

    constructor(private injector: Injector) { }

    handleError(error: any): void {
        if (error instanceof HttpErrorResponse) // this needs to be triggered
            this.injector.get(NgZone).run(() => this.injector.get(MatSnackBar).open(error.message))

        console.error(error)
    }

}

findProject（2）将抛出HttpErrorResponse，因为项目2不存在。

工作

this.projectService.findProject(2).subscribe()

不起作用

await this.projectService.findProject(2).toPromise()

不起作用

await this.projectService.findProject(2).toPromise().catch(error => { throw error })

不起作用

try {
  await this.projectService.findProject(2).toPromise()
} catch (e) {
  console.log(e instanceof HttpErrorResponse) // true
  throw e
}

ProjectService是一个摇摇欲坠的生成类，它返回一个Observable

编辑：这是handleError方法中的错误对象：

Error: Uncaught (in promise): HttpErrorResponse: {"headers":{"normalizedNames":{},"lazyUpdate":null},"status":404,"statusText":"OK","url":"http://localhost:9090/api/project/2","ok":false,"name":"HttpErrorResponse","message":"Http failure response for http://localhost:9090/api/project/2: 404 OK","error":{"timestamp":1534921795114,"status":404,"error":"Not Found","exception":"de.dlh.lhind.lhindquiz.controller.ResourceNotFoundException","message":"No message available","path":"/api/project/2"}}
    at resolvePromise (zone.js:814)
    at zone.js:724
    at rejected (main.js:105)
    at ...

promise似乎将HttpErrorResponse包裹在常规Error周围，并且error.message确实是请求的对象

Answer 1

我刚遇到同样的问题，偶然发现了你的问题。

如果需要，您似乎可以通过在ErrorHandler中展开异常来解决此问题（至少在Angular 7中如此）。

if (error.promise && error.rejection) {
    // Promise rejection wrapped by zone.js
    error = error.rejection;
}

// regular error handling code

注意：我根据以下问题console.error("%O", error)得出了包装错误对象的结构：Chrome: Print exception details to console

Angular自定义错误处理程序未从Promise获取错误类型

1 个答案: