如何在ANgular7中传递HttpUrl中的字典对象？

import { URLSearchParams } from '@angular/http';

// 创建一个空的URLSearchParams对象
let params = new URLSearchParams();

// 添加字典对象的键值对
let dictionary = { key1: 'value1', key2: 'value2' };
for (let key in dictionary) {
  params.set(key, dictionary[key]);
}

// 将URL参数字符串添加到HTTP请求的URL中
let url = 'http://example.com/api?' + params.toString();

import { HttpClient } from '@angular/common/http';

constructor(private http: HttpClient) { }

// 发送GET请求
this.http.get(url).subscribe(response => {
  // 处理响应数据
});

// 发送POST请求
this.http.post(url, data).subscribe(response => {
  // 处理响应数据
});