问题
I'd like to send a Message using Google's Gmail API. I've authenticated successfully, and am trying to use GmailService to send a message.
I'd like to use this:
myService.Users.Messages.Send(myMessage, "me").Execute();
where myService is a Google.Apis.Gmail.v1.GmailService and myMessage is a Google.Apis.Gmail.v1.Data.Message.
myService is fine, I've done the OAuth dance. I can get messages from my Inbox and all that. But I don't know how to construct myMessage. I have a standard .NET MailMessage, with human-readable Subject, Body, To, From etc.
But the Google Message class takes fields Payload or Raw. What's the easiest way to convert a full MailMessage to a string which I can set to the Payload or Raw properties? Or is this not what I should be doing at all?
The documentation for the Message class.
回答1:
I found a solution. Strangely, .NET doesn't seem to support this natively/easily. There's a nice nuget package though, called AE.Net.Mail, which can write an easy-to-create message object to a stream.
Here's the sample code that pointed me in that direction.
Copy-and-pasted code as site seems to be down, and Google's cache might not last forever:
using System.IO;
using System.Net.Mail;
using Google.Apis.Gmail.v1;
using Google.Apis.Gmail.v1.Data;
public class TestEmail {
public void SendIt() {
var msg = new AE.Net.Mail.MailMessage {
Subject = "Your Subject",
Body = "Hello, World, from Gmail API!",
From = new MailAddress("[you]@gmail.com")
};
msg.To.Add(new MailAddress("yourbuddy@gmail.com"));
msg.ReplyTo.Add(msg.From); // Bounces without this!!
var msgStr = new StringWriter();
msg.Save(msgStr);
var gmail = new GmailService(Context.GoogleOAuthInitializer);
var result = gmail.Users.Messages.Send(new Message {
Raw = Base64UrlEncode(msgStr.ToString())
}, "me").Execute();
Console.WriteLine("Message ID {0} sent.", result.Id);
}
private static string Base64UrlEncode(string input) {
var inputBytes = System.Text.Encoding.UTF8.GetBytes(input);
// Special "url-safe" base64 encode.
return Convert.ToBase64String(inputBytes)
.Replace('+', '-')
.Replace('/', '_')
.Replace("=", "");
}
}
回答2:
Here is an alternative version using using MimeKit.
public void SendEmail(MyInternalSystemEmailMessage email)
{
var mailMessage = new System.Net.Mail.MailMessage();
mailMessage.From = new System.Net.Mail.MailAddress(email.FromAddress);
mailMessage.To.Add(email.ToRecipients);
mailMessage.ReplyToList.Add(email.FromAddress);
mailMessage.Subject = email.Subject;
mailMessage.Body = email.Body;
mailMessage.IsBodyHtml = email.IsHtml;
foreach (System.Net.Mail.Attachment attachment in email.Attachments)
{
mailMessage.Attachments.Add(attachment);
}
var mimeMessage = MimeKit.MimeMessage.CreateFromMailMessage(mailMessage);
var gmailMessage = new Google.Apis.Gmail.v1.Data.Message {
Raw = Encode(mimeMessage.ToString())
};
Google.Apis.Gmail.v1.UsersResource.MessagesResource.SendRequest request = service.Users.Messages.Send(gmailMessage, ServiceEmail);
request.Execute();
}
public static string Encode(string text)
{
byte[] bytes = System.Text.Encoding.UTF8.GetBytes(text);
return System.Convert.ToBase64String(bytes)
.Replace('+', '-')
.Replace('/', '_')
.Replace("=", "");
}
Note: If you are getting an email bounce issue, it is likely due to not setting the ReplyToList field. See: GMail API Emails Bouncing
回答3:
C# Code for Gmail API Message (send email)
namespace GmailAPIApp
{
class SendMail
{
static string[] Scopes = { GmailService.Scope.GmailSend };
static string ApplicationName = "Gmail API .NET Quickstart";
static void Main(string[] args)
{
UserCredential credential;
using (var stream =
new FileStream("credentials_dev.json", FileMode.Open,
FileAccess.Read))
{
string credPath = "token_Send.json";
credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
Scopes,
"user",
CancellationToken.None,
new FileDataStore(credPath, true)).Result;
Console.WriteLine("Credential file saved to: " + credPath);
}
// Create Gmail API service.
var service = new GmailService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = ApplicationName,
});
// Define parameters of request.
string plainText = "To:xxxx@gmail.com\r\n" +
"Subject: Gmail Send API Test\r\n" +
"Content-Type: text/html; charset=us-ascii\r\n\r\n" +
"<h1>TestGmail API Testing for sending <h1>";
var newMsg = new Google.Apis.Gmail.v1.Data.Message();
newMsg.Raw = SendMail.Base64UrlEncode(plainText.ToString());
service.Users.Messages.Send(newMsg, "me").Execute();
Console.Read();
}
private static string Base64UrlEncode(string input)
{
var inputBytes = System.Text.Encoding.UTF8.GetBytes(input);
// Special "url-safe" base64 encode.
return Convert.ToBase64String(inputBytes)
.Replace('+', '-')
.Replace('/', '_')
.Replace("=", "");
}
}
}
回答4:
This is the code that worked for me:
Private Async Sub BtnSendGmail_Click(sender As Object, e As EventArgs) Handles BtnSendGmail.Click
Try
Dim credential As UserCredential = Await GoogleWebAuthorizationBroker.AuthorizeAsync(New ClientSecrets With {
.ClientId = "---------Your ClientId------------",
.ClientSecret = "----------Your ClientSecret-----------"
}, {GmailService.Scope.GmailSend}, "user", CancellationToken.None, New FileDataStore(Me.GetType().ToString()))
Dim service = New GmailService(New BaseClientService.Initializer() With {
.HttpClientInitializer = credential,
.ApplicationName = Me.GetType().ToString()
})
Dim plainText As String = "From: sender@gmail.com" & vbCrLf &
"To: dest1@gmail.com," & "dest2@gmail.com" & vbCrLf &
"Subject: This is the Subject" & vbCrLf &
"Content-Type: text/html; charset=us-ascii" & vbCrLf & vbCrLf &
"This is the message text."
Dim newMsg = New Google.Apis.Gmail.v1.Data.Message With {
.Raw = EncodeBase64(plainText.ToString())
}
service.Users.Messages.Send(newMsg, "me").Execute()
MessageBox.Show("Message Sent OK")
Catch ex As Exception
MessageBox.Show("Message failed :" & vbCrLf & "Source: " & ex.Source & vbCrLf & "HResult: " & ex.HResult & vbCrLf & "Message: " &
ex.Message & vbCrLf & "StackTrace: " & ex.StackTrace)
End Try
End Sub
Public Shared Function EncodeBase64(ByVal text As String) As String
' Encodes a text-string for sending as an email message
Dim bytes As Byte() = System.Text.Encoding.UTF8.GetBytes(text)
Return System.Convert.ToBase64String(bytes).Replace("+"c, "-"c).Replace("/"c, "_"c).Replace("=", "")
End Function
来源：https://stackoverflow.com/questions/32787230/how-to-create-a-gmail-api-message