使用 GMail api 从各种应用程序内发送电子邮件。 使用 MimeKit 生成消息内容。 问题是，当我生成消息并将其发送出去时，我总是会在输出中出现许多 Â 字符的实例。这些字符都出现在电子邮件的签名栏中的电话号码前面。
我编写了一个示例应用程序，.Net Core Console App，它演示了这个问题：
using Google.Apis.Auth.OAuth2;
using Google.Apis.Gmail.v1;
using Google.Apis.Gmail.v1.Data;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using MimeKit;
using System.Text;
string[] Scopes = {"https://www.googleapis.com/auth/userinfo.email",
"https://www.googleapis.com/auth/gmail.send",
"https://www.googleapis.com/auth/gmail.settings.basic"};
string ApplicationName = "EMailIntegration";
string mySignature = string.Empty;
string myEMail = string.Empty;
string template = "<!DOCTYPE html><html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /><style>body { font-family: Arial, sans-serif; color: #231F20;}</style></head><body>%body%<br>%signature%</body></html>";
UserCredential credential = null;
var success = await DoAuthenticationAsync();
if (success == false)
{
Console.WriteLine("Authentication failed!");
Console.ReadLine();
return;
}
else
{
Console.WriteLine($"Authenticated as {myEMail}");
}
//call your gmail service
var service = new GmailService(new BaseClientService.Initializer() { HttpClientInitializer = credential, ApplicationName = ApplicationName });
//create the Google message object
var msg = new Google.Apis.Gmail.v1.Data.Message();
string[] sendTo = { "[email protected]" };
MimeKit.MimeMessage mimeMsg = new MimeKit.MimeMessage();
//add the message destinations
foreach (string dest in sendTo)
{
mimeMsg.To.Add(MimeKit.MailboxAddress.Parse(dest));
}
var msgBlob = template.Replace("%body%", "<p>This is a test to see if we can eliminate issues with strange characters appearing in signature blocks.</p>");
msgBlob = msgBlob.Replace("%signature%", mySignature);
mimeMsg.Subject = "Email Integration Testing";
mimeMsg.Body = new TextPart(MimeKit.Text.TextFormat.Html)
{
Text = msgBlob
};
msg.Raw = Base64UrlEncode(mimeMsg.ToString());
//send the message
service.Users.Messages.Send(msg, "me").Execute();
Console.WriteLine($"Sent!");
Console.ReadLine();
string Base64UrlEncode(string input)
{
var data = Encoding.UTF8.GetBytes(input);
return Convert.ToBase64String(data)
.Replace("+", "-")
.Replace("/", "_")
.Replace("=", "");
}
//The following code is used to authenticate with Google API, obtain the users email address and signature block.
async Task<bool> DoAuthenticationAsync()
{
ClientSecrets secrets;
// this obtains the application secrets data we need to indicate our application is asking to authenticate.
using (var strm = new FileStream("credentials.json", FileMode.Open, FileAccess.Read))
{
secrets = GoogleClientSecrets.FromStream(strm).Secrets;
}
try
{
// this is the magic black box that does the authenticating.
credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(secrets, Scopes, "user", CancellationToken.None, new FileDataStore("Google.API.Auth", false));
var init = new BaseClientService.Initializer();
init.HttpClientInitializer = credential;
var svc = new GmailService(init);
// this grabs the list of all e-mail aliases for the signed-in user and selects the primary
ListSendAsResponse result = svc.Users.Settings.SendAs.List("me").Execute();
foreach (SendAs itm in result.SendAs)
{
if (itm.IsPrimary.HasValue)
{
if (itm.IsPrimary == true)
{
// save as the signature blob to use.
mySignature = itm.Signature;
myEMail = itm.SendAsEmail;
break;
}
}
}
}
catch (Exception)
{
return false;
}
return true;
}
从 Google 中提取的签名块看起来与此“相似”：
<div dir="ltr">
<table style="color:rgb(35,31,32);font-family:Arial,sans-serif;font-size:medium;width:554px">
<tbody>
<tr>
<td width="275px">
<div style="font-size:14pt;font-weight:bold">Shane Brodie</div>
<div style="font-family:Aral,sans-serif;font-size:10pt;margin-bottom:10px">Senior Programmer/Analyst</div>
<div style="font-size:10pt;margin-bottom:4px"><strong>Toll Free:</strong> 204-555-1234</div>
<div style="font-size:10pt;margin-bottom:4px"><strong>Office:</strong> 204-555-1234</div>
<div style="font-size:10pt;margin-bottom:4px"><b>Extension:</b> 123</div>
<div style="font-size:10pt;margin-bottom:4px"><b>Cell Phone:</b> 204-555-1234</div>
<div style="font-size:10pt;margin-bottom:4px"><a href="mailto:[email protected]" target="_blank">[email protected]</a></div>
</td>
<td style="width:4px;border-right:4px solid rgb(65,65,66);height:142px">
</td>
<td width="275px">
<div style="padding-bottom:5px"><a href="https://maverickind.ca/" target="_blank"><img src="http://maverickind.ca/wp-content/uploads/2023/11/maverick.png" width="200px" style="margin-bottom:10px;font-style:italic"></a></div>
<div style="display:table">
<div style="display:table-row">
<div style="display:table-cell"><a href="http://www.intersteel.ca/" title="Intersteel" target="_blank"><img src="http://maverickind.ca/wp-content/uploads/2023/12/INT-Sig-e1707227175846.png" style="width:40.5px;height:40.5px"></a></div>
<div style="display:table-cell"><a href="https://defenderpumpguard.com/" title="Defender" target="_blank"><img src="http://maverickind.ca/wp-content/uploads/2023/12/Def-Fist-Sig-e1707227150848.png" style="width:40.5px;height:40.5px"></a></div>
<div style="display:table-cell"><a href="http://www.maverickind.ca/" title="Maverick Industries Ltd." target="_blank"><img src="http://maverickind.ca/wp-content/uploads/2023/12/Mav-Horns-SIG-e1707227104191.png" style="width:40.5px;height:40.5px"></a></div>
</div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
我对数据进行了轻微的清理并格式化以方便查看。 任何想法将不胜感激。 我已经为这个问题奋斗了好几个星期了。
不要使用 MimeMessage.ToString() 来序列化消息。
使用 MimeMessage.WriteTo() 代替。
using (var memory = new MemoryStream ()) {
var format = FormatOptions.Default.Clone ();
format.NewLineFormat = NewLineFormat.Dos;
mimeMsg.WriteTo (format, memory);
var msgData = memory.ToArray ();
msg.Raw = Base64UrlEncode (msgData);
}
string Base64UrlEncode(byte[] data)
{
return Convert.ToBase64String(data)
.Replace("+", "-")
.Replace("/", "_")
.Replace("=", "");
}