如何使用SendGrid Api在单个电子邮件中发送多个附件？

Question

我能够与单个附件发送电子邮件，但我不能在单个邮件

 try { 
      SendGrid sendgrid = new SendGrid(SENDGRID_USERNAME, SENDGRID_PASSWORD); 

      SendGrid.Email email = new SendGrid.Email(); 

      // Get values from edit text to compose email 
      // TODO: Validate edit texts 
      email.addTo(mTo); 
      email.setFrom(mFrom); 
      email.setSubject(mSubject); 
      email.setText(mText); 

      // Attach image 
      if (mUri != null) { 
       email.addAttachment(mAttachmentName, mAppContext.getContentResolver().openInputStream(mUri)); 
      } 

      // Send email, execute http request 
      SendGrid.Response response = sendgrid.send(email); 
      mMsgResponse = response.getMessage(); 

      Log.d("SendAppExample", mMsgResponse); 

     } catch (SendGridException | IOException e) { 
      Log.e("SendAppExample", e.toString()); 
     } 

     return null; 
    } 

Answer 1

• 我假定您已经阅读此URL发送多个附件发现了什么：How to Send Email Using SendGrid with Azure

• 你将在这里找到一个项目的完整示例：sendgrid-csharp

• 更具体的添加多个附件：SendGridMessage.cs

这是我的代码修改：

1. 从流增加附件创建方法

   private static async Task AddAttachmentAsync(List<Attachment> ls, string filename, Stream contentStream, string type = null, string disposition = null, string content_id = null, CancellationToken cancellationToken = default(CancellationToken)) 
   { 
       // Stream doesn't want us to read it, can't do anything else here 
       if (contentStream == null || !contentStream.CanRead) 
       { 
        return; 
       } 
   
       var contentLength = Convert.ToInt32(contentStream.Length); 
       var streamBytes = new byte[contentLength]; 
   
       await contentStream.ReadAsync(streamBytes, 0, contentLength, cancellationToken); 
   
       var base64Content = Convert.ToBase64String(streamBytes); 
   
       ls.Add(AddAttachment(filename, base64Content, type, disposition, content_id)); 
   } 
   
   private static Attachment AddAttachment(string filename, string base64Content, string type = null, string disposition = null, string content_id = null) 
   { 
       if (string.IsNullOrWhiteSpace(filename) || string.IsNullOrWhiteSpace(base64Content)) 
       { 
        return null; 
       } 
   
       var attachment = new Attachment 
       { 
        Filename = filename, 
        Content = base64Content, 
        Type = type, 
        Disposition = disposition, 
        ContentId = content_id 
       }; 
   
       return attachment; 
   } 
   

2. 如何从数据流中添加附件SendGridMessage

   //var msg = new SendGridMessage(); 
   //your another settings addContent(body), subject, To etc 
   //HttpFileCollection fuAttachment --> list attachments from http file collection 
   //dont forget : msg.Attachments = new List<Attachment>(); 
   for (var i = 0; i < fuAttachment.Count; i++) 
   { 
       string FileName = Path.GetFileName(fuAttachment[i].FileName); 
       await AddAttachmentAsync(msg.Attachments, FileName, 
       fuAttachment[i].InputStream); 
   } 
   //var apiKey = _SendGridAPIKey; 
   //var client = new SendGridClient(apiKey); 
   //var response = await client.SendEmailAsync(msg);