Create and Send Messages using Microsoft Graph API in C#

readme.md

Read the complete article on how to create and send messages using Microsoft Graph API in C#: https://blog.aspose.com/2022/04/18/manage-folders-using-ms-graph-api-in-csharp/

create-message.cs

// Generate the access token
AccessTokenProvider tokenProvider = new AccessTokenProvider();

// Create a Graph client
IGraphClient client = GraphClient.GetClient(tokenProvider, "tenant ID");

// Create a new message
MapiMessage mm = new MapiMessage();
mm.Subject = "EMAILNET-39318 " + Guid.NewGuid().ToString();
mm.Body = "EMAILNET-39318 REST API v1.0 - Create Message";
mm.SetProperty(KnownPropertyList.DisplayTo, "to@host.com");
mm.SetProperty(KnownPropertyList.SenderName, "from");
mm.SetProperty(KnownPropertyList.SentRepresentingEmailAddress, "from@host.com");

// Create message in inbox folder
MapiMessage createdMessage = client.CreateMessage(Clients.Graph.KnownFolders.Inbox, mm);

send-message.cs

// Generate the access token
AccessTokenProvider tokenProvider = new AccessTokenProvider();

// Create a Graph client
IGraphClient client = GraphClient.GetClient(tokenProvider, "tenant ID");

// Create a new message
MapiMessage mm = new MapiMessage();
mm.Subject = "EMAILNET-39318 " + Guid.NewGuid().ToString();
mm.Body = "EMAILNET-39318 REST API v1.0 - Create Message";
mm.SetProperty(KnownPropertyList.DisplayTo, "to@host.com");
mm.SetProperty(KnownPropertyList.SenderName, "from");
mm.SetProperty(KnownPropertyList.SentRepresentingEmailAddress, "from@host.com");

// Send message
client.Send(mm);

token-provider.cs

class AccessTokenProvider : ITokenProvider
{
    DateTime expirationDate = DateTime.Now;

    public void Dispose()
    {
    }
    public OAuthToken GetAccessToken(bool ignoreExistingToken)
    {
        // Gets oAuth access token.
        // If ignoreExistingToken is true, requests new token from a server. Otherwise behavior is depended on whether token exists or not.
        // If token exists and its expiration date is not expired returns current token, otherwise requests new token from a server.
        return null;
    }
    public OAuthToken GetAccessToken()
    {
        // Gets oAuth access token.
        // If token exists and its expiration date is not expired returns current token, otherwise requests new token from a server.
        return new OAuthToken("token", expirationDate);
    }
}