andresharpe/dotbot/integrate-graph-api

var scopes = new[] { "https://graph.microsoft.com/.default" };
var options = new TokenCredentialOptions
{
    AuthorityHost = AzureAuthorityHosts.AzurePublicCloud
};
 
var clientSecretCredential = new ClientSecretCredential(
    tenantId, clientId, clientSecret, options);
 
var graphClient = new GraphServiceClient(clientSecretCredential, scopes);

var messages = await graphClient.Users[userId]
    .Messages
    .Request()
    .Select("id,subject,from,receivedDateTime,bodyPreview")
    .Filter($"receivedDateTime ge {sinceDate:o}")
    .OrderBy("receivedDateTime desc")
    .Top(50)
    .GetAsync();

var message = new Message
{
    Subject = subject,
    Body = new ItemBody
    {
        ContentType = BodyType.Html,
        Content = htmlBody
    },
    ToRecipients = recipients.Select(r => new Recipient
    {
        EmailAddress = new EmailAddress { Address = r }
    }).ToList()
};
 
await graphClient.Users[userId]
    .SendMail(message, saveToSentItems: true)
    .Request()
    .PostAsync();

var events = await graphClient.Users[userId]
    .CalendarView
    .Request()
    .Header("Prefer", "outlook.timezone=\"UTC\"")
    .Select("id,subject,start,end,attendees,location")
    .Top(100)
    .GetAsync(startDateTime, endDateTime);

var newEvent = new Event
{
    Subject = subject,
    Start = new DateTimeTimeZone
    {
        DateTime = startTime.ToString("o"),
        TimeZone = "UTC"
    },
    End = new DateTimeTimeZone
    {
        DateTime = endTime.ToString("o"),
        TimeZone = "UTC"
    },
    Attendees = attendees.Select(a => new Attendee
    {
        EmailAddress = new EmailAddress { Address = a.Email, Name = a.Name },
        Type = AttendeeType.Required
    }).ToList()
};
 
await graphClient.Users[userId]
    .Events
    .Request()
    .AddAsync(newEvent);

var user = await graphClient.Users[userId]
    .Request()
    .Select("displayName,jobTitle,department,officeLocation,manager")
    .Expand("manager")
    .GetAsync();

try
{
    var messages = await graphClient.Users[userId].Messages.Request().GetAsync();
}
catch (ServiceException ex) when (ex.StatusCode == System.Net.HttpStatusCode.NotFound)
{
    // Handle not found
}
catch (ServiceException ex) when (ex.StatusCode == System.Net.HttpStatusCode.Unauthorized)
{
    // Handle auth failure - refresh token
}
catch (ServiceException ex)
{
    // Log and handle other Graph API errors
    _logger.LogError(ex, "Graph API error: {Code} - {Message}", ex.Error.Code, ex.Error.Message);
}