Request for advice or Example Google.Apis and MailKit

Question

I am looking for a way to send email with Google.apis and MailKit to send attachments and message in Window Form I have GoogleClientSecrets .json I don't know how to use it Please help me Thank you

Local Coders · Answer

Prerequisites Google API Client Library : Install the Google.Apis.Auth and Google.Apis.Gmail.v1 packages. MailKit : Install the MailKit package via NuGet. Run this in the Package Manager Console to install these packages: Install-Package Google.Apis.Auth Install-Package Google.Apis.Gmail.v1 Install-Package MailKit Step 1: Set Up Google OAuth 2.0 Authentication To authenticate with Google using your client_secrets.json  follow these steps: Load Client Secrets : Use GoogleClientSecrets to load your client_secrets.json . Authenticate : Use OAuth 2.0 to obtain access tokens. Save Access Token (optional): Save the token if you need to reuse it later. using Google.Apis.Auth.OAuth2; using Google.Apis.Gmail.v1; using Google.Apis.Services; using Google.Apis.Util.Store; using System; using System.IO; using System.Threading; public class GoogleAuthHelper { public static UserCredential AuthenticateUser() { UserCredential credential; using (var stream = new FileStream(client_secrets.json FileMode.Open FileAccess.Read)) { string credPath = token.json; // Path to store access tokens credential = GoogleWebAuthorizationBroker.AuthorizeAsync( GoogleClientSecrets.Load(stream).Secrets new[] { GmailService.Scope.GmailSend } user CancellationToken.None new FileDataStore(credPath true)).Result; } return credential; } } Step 2: Set Up MailKit to Send the Email Once authenticated you can use MailKit to send emails via SMTP using the credentials from Google. using MailKit.Net.Smtp; using MimeKit; using Google.Apis.Auth.OAuth2; using System.Threading; public class EmailSender { public static void SendEmailWithAttachment(UserCredential credential string toEmail string subject string body string attachmentPath) { var email = new MimeMessage(); email.From.Add(new MailboxAddress(Your Name your-email@gmail.com)); email.To.Add(new MailboxAddress( toEmail)); email.Subject = subject; // Create body text and attachment parts var bodyBuilder = new BodyBuilder { TextBody = body }; if (!string.IsNullOrEmpty(attachmentPath)) { bodyBuilder.Attachments.Add(attachmentPath); } email.Body = bodyBuilder.ToMessageBody(); // Use the access token to authenticate with Gmail SMTP var token = credential.Token.AccessToken; using (var client = new SmtpClient()) { client.Connect(smtp.gmail.com 587 MailKit.Security.SecureSocketOptions.StartTls); // Authenticate using XOAUTH2 var oauth2 = new SaslMechanismOAuth2(your-email@gmail.com token); client.Authenticate(oauth2); client.Send(email); client.Disconnect(true); } } }

Paradorn · Answer

Hi Thank you for All Reply me but I'd like to ask you something in Code example Where is Download json file from google cloud APIs ? using (var stream = new FileStream( client_secret_.json  FileMode.Open FileAccess.Read)) { string credPath = token.json ; credential = GoogleWebAuthorizationBroker.AuthorizeAsync( GoogleClientSecrets.Load(stream).Secrets Scopes user CancellationToken.None new FileDataStore(credPath true)).Result; } Thank you.

Aman Gupta · Answer

Hi Paradon To send an email with attachments using Google APIs and MailKit in a Windows Forms application you will need to follow several steps. Below is a structured guide to help you set this up. 1. Set Up Your Google Cloud Project Go to the Google Cloud Console. Create a new project or select an existing one. Enable the Gmail API for your project. Create credentials (OAuth 2.0 Client IDs) and download the credentials.json file. 2. Install Required Libraries Open your Windows Forms project in Visual Studio. Use NuGet Package Manager to install the following packages: Google.Apis.Gmail.v1 MailKit MimeKit 3. Configure Your Windows Form Design your form to include: TextBox for recipient email ( txtTo ) TextBox for subject ( txtSubject ) TextBox for message body ( txtMessage ) Button to send the email ( btnSend ) Optionally a TextBox for file attachment ( txtAttachment ) 4. Code Implementation Here’s a sample code to send an email with an attachment using MailKit and Google APIs: using System; using System.IO; using System.Threading; using System.Windows.Forms; using Google.Apis.Auth.OAuth2; using Google.Apis.Gmail.v1; using Google.Apis.Services; using Google.Apis.Util.Store; using MailKit.Net.Smtp; using MailKit.Security; using MimeKit; namespace YourNamespace { public partial class YourForm : Form { private const string ApplicationName = Your Application Name; private static readonly string[] Scopes = { GmailService.Scope.GmailSend }; public YourForm() { InitializeComponent(); } private void btnSend_Click(object sender EventArgs e) { UserCredential credential; // Load client secrets using (var stream = new FileStream(credentials.json FileMode.Open FileAccess.Read)) { string credPath = token.json; credential = GoogleWebAuthorizationBroker.AuthorizeAsync( GoogleClientSecrets.Load(stream).Secrets Scopes user CancellationToken.None new FileDataStore(credPath true)).Result; } // Create the email message var message = new MimeMessage(); message.From.Add(new MailboxAddress(Your Name your-email@gmail.com)); message.To.Add(new MailboxAddress( txtTo.Text)); message.Subject = txtSubject.Text; var bodyBuilder = new BodyBuilder { HtmlBody = txtMessage.Text }; // Attach a file if provided if (!string.IsNullOrEmpty(txtAttachment.Text)) { bodyBuilder.Attachments.Add(txtAttachment.Text); } message.Body = bodyBuilder.ToMessageBody(); // Send the email using MailKit using (var client = new SmtpClient()) { client.Connect(smtp.gmail.com 587 SecureSocketOptions.StartTls); client.Authenticate(your-email@gmail.com credential.Token.AccessToken); client.Send(message); client.Disconnect(true); } MessageBox.Show(Your email has been successfully sent! Message MessageBoxButtons.OK MessageBoxIcon.Information); } } } 5. Important Notes OAuth 2.0 Authentication : The code uses OAuth 2.0 for authentication. Ensure that your credentials.json file is in the same directory as your executable or adjust the path accordingly. Token Storage : The token is stored in token.json . This allows the application to remember the user's authentication for future sessions. Attachments : The code checks if a file path is provided in the txtAttachment TextBox and attaches it to the email. SMTP Settings : Make sure to use the correct SMTP settings for Gmail including enabling Less secure app access in your Google account settings if necessary. By following these steps you should be able to send emails with attachments using Google APIs and MailKit in your Windows Forms application.

KarleyKiehn · Answer

For integration advice using Google.Apis and MailKit consider exploring comprehensive tutorials or forums. You might also connect with developers on platforms like Omegle to discuss specific challenges and solutions. By sharing your questions you can gain valuable insights and code examples that enhance your project.