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我有一个customerService我试图注入的地方httpClient。我评论的那一行发生了错误//error happens on this line。一切正常，直到我尝试将 httpClient 注入我的服务。

错误信息是：

`compiler.js:485 Uncaught Error: Can't resolve all parameters for CustomerService: (?).
    at syntaxError (compiler.js:485)
    at CompileMetadataResolver._getDependenciesMetadata (compiler.js:15700)
    at CompileMetadataResolver._getTypeMetadata (compiler.js:15535)
    at CompileMetadataResolver._getInjectableMetadata (compiler.js:15515)
    at CompileMetadataResolver.getProviderMetadata (compiler.js:15875)
    at compiler.js:15786
    at Array.forEach (<anonymous>)
    at CompileMetadataResolver._getProvidersMetadata (compiler.js:15746)
    at CompileMetadataResolver.getNgModuleMetadata (compiler.js:15314)
    at CompileMetadataResolver.getNgModuleSummary

(compiler.js:15133)`

不知道从哪里开始调试。任何帮助，将不胜感激。谢谢你！

import { Observable } from "rxjs";
import { Injectable } from "@angular/core";
import { HttpClient } from "@angular/common/http";

@Injectable()
export class CustomerService {

    private baseUri: string = "hosthere.com"

    constructor(
        private http: HttpClient //error happens on this line
    ) { }

    get(email: string): Observable<any> {
        const uri = `${this.baseUri}/customer/${email}`;
        return this.http.get(uri).map(res => res.json());
    }
}

这是我的客户模块

import { NgModule } from "@angular/core";
import { SharedModule } from "../../shared/shared.module";

import { CustomerRouteModule } from "./cutomer.route.module";

import { SearchComponent } from "./";

import { CustomerService } from "../../services";


    @NgModule({
        imports: [SharedModule, CustomerRouteModule],
        declarations: [SearchComponent],
        providers: [CustomerService],
        exports: []
    })
    export class CustomerModule {

    }

这是我的共享模块

import { NgModule } from "@angular/core";
import { CommonModule } from "@angular/common";
import { FormsModule, ReactiveFormsModule } from "@angular/forms";
import { HttpClientModule  } from "@angular/common/http";
import { AppMaterialModule } from "./app.material.module";
import { FlexLayoutModule } from "@angular/flex-layout";

import { HttpClientProvider } from "../services";


@NgModule({
    imports: [
        CommonModule,
        FormsModule,
        ReactiveFormsModule,
        HttpClientModule ,
        AppMaterialModule
    ],
    providers: [

    ],
    exports: [
        AppMaterialModule,
        FlexLayoutModule,
        FormsModule,
        HttpClientModule 
    ]
})
export class SharedModule {

}
4

3 回答 3

1
于 2018-02-26T03:08:58.207 回答
0

我在这里找到了答案：

从 Angular 4 升级到 5.0.1 时出现“未捕获的错误：无法解析所有参数”运行时错误

我从我的 polyfill 中删除了反射，我很傻。

谢谢大家的帮助。

于 2018-02-26T04:06:05.313 回答
0

创建新文件或添加到现有的polyfills.ts 

import 'core-js/es7/reflect';

包含到 webpack.config

module.exports = {
    mode: 'production',
    devtool: 'source-map',
    entry: {
        'app': './ClientApp/main.ts',
        'polyfills': './ClientApp/polyfills.ts'
    },...

这对我有帮助

于 2018-06-23T18:07:17.307 回答