C# SendGrid - SendAsync 方法错误答案

【问题标题】：C# SendGrid - SendAsync Method ErrorC# SendGrid - SendAsync 方法错误
【发布时间】：2017-07-05 12:33:59
【问题描述】：

我已按照教程在我的 C# ASP.NET 应用程序中设置 SendGrid。按照建议，我的 IdentityConfig.cs 中有以下代码：

using SendGrid;
using System.Net;
using System.Configuration;
using System.Diagnostics;
using Microsoft.AspNet.Identity;
using System.Threading.Tasks;
using SendGrid.Helpers.Mail;

    public async Task SendAsync(IdentityMessage message)
    {
        await configSendGridasync(message);
    }

    // Use NuGet to install SendGrid (Basic C# client lib) 
    private async Task configSendGridasync(IdentityMessage message)
    {
        var myMessage = new SendGridMessage();
        myMessage.AddTo(message.Destination);
        myMessage.From = new EmailAddress(
                            "johnlowry484@gmail.com", "John Lowry");
        myMessage.Subject = message.Subject;
        myMessage.PlainTextContent = message.Body;
        myMessage.HtmlContent = message.Body;

        var credentials = new NetworkCredential(
                   ConfigurationManager.AppSettings["mailAccount"],
                   ConfigurationManager.AppSettings["mailPassword"]
                   );

        // Create a Web transport for sending email.
        **var transportWeb = new Web(credentials);**

        // Send the email.
        if (transportWeb != null)
        {
            await transportWeb.DeliverAsync(myMessage);
        }
        else
        {
            Trace.TraceError("Failed to create Web transport.");
            await Task.FromResult(0);
        }
    }

var transportWeb = new Web(credentials); 行导致错误：

找不到类型或命名空间“Web”

我在网上看到的任何地方，SendGrid.Web(credentials) 都是有效的，但它不适合我。

我错过了什么吗？

谢谢，约翰

【问题讨论】：

您使用的 .net 和 sendgrid 版本是什么？可能是版本不匹配问题。
.Net Framework 4.5.2 和 SendGrid.9.5.0
如果将new Web 替换为new SendGrid.Web 会发生什么？
我收到错误消息
你试过这个不使用Websendgrid.com/docs/Integrate/Code_Examples/v3_Mail/csharp.html的示例代码吗？

标签： c# asp.net sendgrid

【解决方案1】：

您可以使用SmtpClient 为凭据创建一个实例。

var Smtp = new SmtpClient()
{
    Credentials = new NetworkCredential(ConfigurationManager.AppSettings["mailAccount"],
                    ConfigurationManager.AppSettings["mailPassword"])
};
...
await Smtp.SendAsync(myMessage);

【讨论】：

【解决方案2】：

如果您使用 V3，则需要参考文档 https://sendgrid.com/docs/Integrate/Code_Examples/v3_Mail/csharp.html

// using SendGrid's C# Library
// https://github.com/sendgrid/sendgrid-csharp
using SendGrid;
using SendGrid.Helpers.Mail;
using System;
using System.Threading.Tasks;

namespace Example
{
    internal class Example
    {
        private static void Main()
        {
            Execute().Wait();
        }

        static async Task Execute()
        {
            var apiKey = Environment.GetEnvironmentVariable("NAME_OF_THE_ENVIRONMENT_VARIABLE_FOR_YOUR_SENDGRID_KEY");
            var client = new SendGridClient(apiKey);
            var from = new EmailAddress("test@example.com", "Example User");
            var subject = "Sending with SendGrid is Fun";
            var to = new EmailAddress("test@example.com", "Example User");
            var plainTextContent = "and easy to do anywhere, even with C#";
            var htmlContent = "<strong>and easy to do anywhere, even with C#</strong>";
            var msg = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
            var response = await client.SendEmailAsync(msg);
        }
    }
}

已编辑：You can downgrade to 6.0.1 and it will work fine

【讨论】：