如何使用ASP.NET核心web api从Angular 6发送电子邮件？

使用ASP.NET Core Web API从Angular 6发送电子邮件的步骤如下：

首先，确保你已经安装了ASP.NET Core和Angular 6的开发环境。
在ASP.NET Core Web API项目中，创建一个用于发送电子邮件的控制器。可以使用以下代码作为示例：

using Microsoft.AspNetCore.Mvc;
using System.Net.Mail;

namespace YourNamespace.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class EmailController : ControllerBase
    {
        [HttpPost]
        public IActionResult SendEmail([FromBody] EmailModel emailModel)
        {
            try
            {
                using (MailMessage mailMessage = new MailMessage())
                {
                    mailMessage.From = new MailAddress("your-email@example.com");
                    mailMessage.To.Add(emailModel.To);
                    mailMessage.Subject = emailModel.Subject;
                    mailMessage.Body = emailModel.Body;

                    using (SmtpClient smtpClient = new SmtpClient("your-smtp-server"))
                    {
                        smtpClient.Send(mailMessage);
                    }
                }

                return Ok("Email sent successfully!");
            }
            catch (Exception ex)
            {
                return BadRequest($"Failed to send email: {ex.Message}");
            }
        }
    }

    public class EmailModel
    {
        public string To { get; set; }
        public string Subject { get; set; }
        public string Body { get; set; }
    }
}

在Angular 6项目中，创建一个用于发送电子邮件的服务。可以使用以下代码作为示例：

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

@Injectable({
  providedIn: 'root'
})
export class EmailService {
  private apiUrl = 'your-api-url';

  constructor(private http: HttpClient) { }

  sendEmail(emailModel: EmailModel) {
    return this.http.post(this.apiUrl + '/email', emailModel);
  }
}

export class EmailModel {
  to: string;
  subject: string;
  body: string;
}

在Angular 6项目中的组件中，使用EmailService来发送电子邮件。可以使用以下代码作为示例：

import { Component } from '@angular/core';
import { EmailService, EmailModel } from './email.service';

@Component({
  selector: 'app-email',
  template: `
    <h1>Send Email</h1>
    <form (ngSubmit)="sendEmail()">
      <input type="email" [(ngModel)]="emailModel.to" name="to" placeholder="To" required>
      <input type="text" [(ngModel)]="emailModel.subject" name="subject" placeholder="Subject" required>
      <textarea [(ngModel)]="emailModel.body" name="body" placeholder="Body" required></textarea>
      <button type="submit">Send</button>
    </form>
  `
})
export class EmailComponent {
  emailModel: EmailModel = new EmailModel();

  constructor(private emailService: EmailService) { }

  sendEmail() {
    this.emailService.sendEmail(this.emailModel)
      .subscribe(
        response => {
          console.log(response);
          // 处理成功发送电子邮件的逻辑
        },
        error => {
          console.error(error);
          // 处理发送电子邮件失败的逻辑
        }
      );
  }
}

请注意，上述代码中的"your-email@example.com"和"your-smtp-server"需要替换为你自己的电子邮件地址和SMTP服务器地址。

这是一个基本的示例，你可以根据自己的需求进行修改和扩展。在实际应用中，你可能还需要添加身份验证、错误处理和其他功能。

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