Send email using Office 365 using unified API - ms-office

Question

We are trying to use the O365 Unified API to send emails from our line-of-business apps. I use the following code to send the email. This throws a DataServiceQueryException exception "Unauthorized".
public async Task SendEmailAsUserAsync(EmailMessage message)
{
try
{
var graphClient = await _authenticationHelper.GetGraphClientAsync();
Message m = InitializeMessage(message);
await graphClient.Me.SendMailAsync(m, true);
}
catch (DataServiceQueryException dsqe)
{
_logger.Error("Could not get files: " + dsqe.InnerException.Message, dsqe);
throw;
}
}
private static Message InitializeMessage(EmailMessage message)
{
ItemBody body = new ItemBody {Content = message.Body, ContentType = BodyType.HTML};
Message m = new Message
{
Body = body,
Subject = message.Subject,
Importance = Importance.Normal,
};
//Add all the to email ids
if (message.ToRecipients != null)
foreach (Models.Messaging.EmailAddress emailAddress in message.ToRecipients)
{
m.ToRecipients.Add(new Recipient { EmailAddress = new Microsoft.Graph.EmailAddress { Address = emailAddress.Address, Name = emailAddress.Name } });
}
return m;
}
The code for _authenticationHelper.GetGraphClientAsync() is
public async Task<GraphService> GetGraphClientAsync()
{
Uri serviceRoot = new Uri(appConfig.GraphResourceUriBeta + appConfig.Tenant);
_graphClient = new GraphService(serviceRoot,
async () => await AcquireTokenAsyncForUser(appConfig.GraphResourceUri, appConfig.Tenant));
return _graphClient;
}
private async Task<string> AcquireTokenAsyncForUser(string resource, string tenantId)
{
AuthenticationResult authenticationResult = await GetAccessToken(resource, tenantId);
_accessCode = authenticationResult.AccessToken;
return _accessCode;
}
private async Task<AuthenticationResult> GetAccessToken(string resource, string tenantId)
{
string authority = appConfig.Authority;
AuthenticationContext authenticationContext = new AuthenticationContext(authority);
ClientCredential credential = new ClientCredential(appConfig.ClientId, appConfig.ClientSecret);
string authHeader = HttpContext.Current.Request.Headers["Authorization"];
string userAccessToken = authHeader.Substring(authHeader.LastIndexOf(' ')).Trim();
UserAssertion userAssertion = new UserAssertion(userAccessToken);
var authenticationResult = await authenticationContext.AcquireTokenAsync(resource, credential, userAssertion);
return authenticationResult;
}
However if I change the SendEmailAsUserAsync method as shown below, the email is sent but an InvalidOperationException is thrown with message "The complex type 'System.Object' has no settable properties."
public async Task SendEmailAsUserAsync(EmailMessage message)
{
try
{
var graphClient = await _authenticationHelper.GetGraphClientAsync();
Message m = InitializeMessage(message);
//await graphClient.Me.SendMailAsync(m, true); //This did not work
var user = await graphClient.Me.ExecuteAsync();
await user.SendMailAsync(m, true);
}
catch (DataServiceQueryException dsqe)
{
_logger.Error("Could not get files: " + dsqe.InnerException.Message, dsqe);
throw;
}
}
Can any one point out if there is something wrong here.

Answer 1

Check the example project below, this has a working example (after you fill in the ClientID etc. in app.config).
Office 365 API demo applications
For sending email it uses the function below, which works if you set it up correctly. It also has a number of functions for Authenticating using Authorization Code Grant Flow.
public async Task SendMail(string to, string subject, string body)
{
var client = await this.AuthenticationHelper
.EnsureOutlookServicesClientCreatedAsync(
Office365Capabilities.Mail.ToString());
Message mail = new Message();
mail.ToRecipients.Add(new Recipient()
{
EmailAddress = new EmailAddress
{
Address = to,
}
});
mail.Subject = subject;
mail.Body = new ItemBody() { Content = body, ContentType = BodyType.HTML };
await client.Me.SendMailAsync(mail, true);
}

Answer 2

Actually, there is no assembly wrapper for the graph API.
Microsoft.Graph.dll is deprecrated.
So, you should to :
Deal with the REST requests : See here : http://graph.microsoft.io/docs/api-reference/v1.0/api/message_send
Generate a wrapper with Microsoft.Vipr project : see here : https://github.com/microsoft/vipr
For the authentication, ADAL works fine :)