(C#) Outlook Send Email with Attachments

This example sends a plain-text email with attachments. Other examples exist for:

Sending plain-text email.
Sending HTML email.
Sending HTML email with embedded images.
Sending HTML email with embedded images and attachments.

Chilkat .NET Downloads

Chilkat .NET Framework

Chilkat for .NET Core

// Important: This example requires Chilkat v9.5.0.68 or greater.

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Http http = new Chilkat.Http();

// Use your previously obtained access token here:
// See the following examples for getting an access token:
//    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
//    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
//    Refresh Access Token (Azure AD v2.0 Endpoint).
//    Refresh Access Token (Azure AD Endpoint).

http.AuthToken = "MICROSOFT_GRAPH_ACCESS_TOKEN";

// To send mail, we'll POST to the following endpoint:
// 
// POST /users/{id | userPrincipalName}/sendMail
// 
// (The special keyword "me" may be used in place of a principal name.)
// 

// Load the files to be attached.
Chilkat.BinData attach1 = new Chilkat.BinData();
attach1.LoadFile("qa_data/pdf/fishing.pdf");
Chilkat.BinData attach2 = new Chilkat.BinData();
attach2.LoadFile("qa_data/msword/sample.docx");

// The body of the POST request contains JSON that specifies the email subject, body,
// recipients, etc.  This example will build the following JSON plain-text email:
// 

// 	{
// 	  "message": {
// 	    "subject": "Sample Email with Attachments",
// 	    "body": {
// 	      "contentType": "Text",
// 	      "content": "This is the plain-text body..."
// 	    },
// 	    "toRecipients": [
// 	      {
// 	        "emailAddress": {
// 		  "name": "Chilkat Software",
// 	          "address": "admin@chilkat.io"
// 	        }
// 	      },
// 	      {
// 	        "emailAddress": {
// 	          "address": "chilkat.support@gmail.com"
// 	        }
// 	      }
// 	    ],
// 	    "ccRecipients": [
// 	      {
// 	        "emailAddress": {
// 		  "name": "Chilkat Blog",
// 		  "address": "admin@cknotes.com"
// 	        }
// 	      }
// 	    ],
// 	    "attachments": [
// 	       {
// 	         "@odata.type": "#microsoft.graph.fileAttachment",
// 	         "name": "fishing.pdf",
// 	         "contentType": "application/pdf",
// 	         "size": <theActualSize>,
// 	         "isInline": false,
// 	         "contentBytes": "base64_data_here"
// 	       },
// 	       {
// 	         "@odata.type": "#microsoft.graph.fileAttachment",
// 	         "name": "sample.docx",
// 	         "contentType": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
// 	         "size": <theActualSize>,
// 	         "isInline": false,
// 	         "contentBytes": "base64_data_here"
// 	       }
// 	    ]
// 	  },
// 	  "saveToSentItems": true
// 	}
// 
// Build the above JSON.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("message.subject","Sample Email with Attachments");
json.UpdateString("message.body.contentType","Text");
json.UpdateString("message.body.content","This is the plain-text body...");

json.UpdateString("message.toRecipients[0].emailAddress.name","Chilkat Software");
json.UpdateString("message.toRecipients[0].emailAddress.address","admin@chilkat.io");
json.UpdateString("message.toRecipients[1].emailAddress.address","chilkat.support@gmail.com");
json.UpdateString("message.ccRecipients[0].emailAddress.name","Chilkat Blog");
json.UpdateString("message.ccRecipients[0].emailAddress.address","admin@cknotes.com");

json.UpdateString("message.attachments[0].\"@odata.type\"","#microsoft.graph.fileAttachment");
json.UpdateString("message.attachments[0].name","fishing.pdf");
json.UpdateString("message.attachments[0].contentType","application/pdf");
json.UpdateInt("message.attachments[0].size",attach1.NumBytes);
json.UpdateBool("message.attachments[0].isInline",false);
json.UpdateBd("message.attachments[0].contentBytes","base64",attach1);

json.UpdateString("message.attachments[1].\"@odata.type\"","#microsoft.graph.fileAttachment");
json.UpdateString("message.attachments[1].name","sample.docx");
json.UpdateString("message.attachments[1].contentType","application/vnd.openxmlformats-officedocument.wordprocessingml.document");
json.UpdateInt("message.attachments[1].size",attach2.NumBytes);
json.UpdateBool("message.attachments[1].isInline",false);
json.UpdateBd("message.attachments[1].contentBytes","base64",attach2);

json.UpdateBool("saveToSentItems",true);

// -------------------------------------------------------------
// Important: This example requires Chilkat v9.5.0.68 or greater.
// -------------------------------------------------------------

// Send the HTTP POST (i.e. send the HTML email)
Chilkat.HttpResponse resp = http.PostJson3("https://graph.microsoft.com/v1.0/me/sendMail","application/json",json);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// The send succeeded if the response status code = 202.
// In the success case, there is no response body.  (We just get the response code to know that it succeeded.)
if (resp.StatusCode != 202) {
    json.Load(resp.BodyStr);
    json.EmitCompact = false;
    Debug.WriteLine(json.Emit());
    Debug.WriteLine("Failed, response status code = " + Convert.ToString(resp.StatusCode));
}
else {
    Debug.WriteLine("Outlook Mail with Attachments Sent.");
}