Working with Exchange Extended Attributes of Exchange Items

Aspose.Email API lets you create, retrieve and update Extended properties of messages using the EWS client of API. The following code sample illustrates this by creating an extended attribute, adding it to the message on the server and retrieve the message as MapiMessage from Exchange server using the client FetchItem.

// Define a PidTagBodyContentId extended property
var extendedProperty = KnownPropertyList.BodyContentId;

// Create a message and set an extended property value
var msg = new MapiMessage("[e-mail]", "[e-mail]", "Test message", "This is a test message");
msg.SetProperty(extendedProperty, "03454432-6230-4e4b-887f-a498ea223599");

// Append message
var uri = ewsClient.AppendMessage(ewsClient.MailboxInfo.InboxUri, msg, true);

// Fetch appended item. Pass the extended property descriptor as method parameter.
var fetchedMsg = ewsClient.FetchItem(uri, new PropertyDescriptor[] { extendedProperty });

// Print the extended property value
Console.WriteLine(fetchedMsg.Properties[extendedProperty].GetString());