//add attachments samples
public static void AddAttachmentsSamples()
{
using (Connection K2Conn = new Connection())
{
//dummy values for process instance ID and activity instance ID
int processInstanceId = 1;
int activityInstanceDestinationID = 10;
string fileName = "Report1.pdf";
//Add an Attachment using the Connection class and the Process Instance's ID
IWorkflowAttachment _attachment = K2Conn.AddAttachment(processInstanceId, fileName, GetFile("Report1.pdf"));
//Add an Attachment using the Connection class and the Worklist Item's SerialNumber
IWorkflowAttachment _attachment1 = K2Conn.AddAttachment("[_serialNo]", fileName, GetFile("Report1.pdf"));
//Add an Attachment using the Connection class and the Process Instance's ID and Activity Instance Destination's ID
IWorkflowAttachment _attachment2 = K2Conn.AddAttachment(processInstanceId, activityInstanceDestinationID, fileName, GetFile("Report1.pdf"));
//Add an Attachment using the Process Instance
ProcessInstance _processInstance = K2Conn.OpenProcessInstance(processInstanceId);
IWorkflowAttachment _attachment3 = _processInstance.AddAttachment(fileName, GetFile("Report1.pdf"));
//Add an Attachment using the WorklistItem
WorklistItem _worklistItem = K2Conn.OpenWorklistItem("[_serialNo]");
IWorkflowAttachment _attachment4 = _worklistItem.AddAttachment(fileName, GetFile("Report1.pdf"));
//Async exampe, where you create the attachment first and then upload the file
//Add an 'empty' attachment
IWorkflowAttachment _attachment5 = K2Conn.AddAttachment(processInstanceId, fileName, null);
//now upload the attachment's file.
//Note. You can only upload the file once and only for an 'empty' attachment.
//Note. This can be used for async purposes, to create the metadata first and secondly upload the file.
IAttachment attachmentWithContent = K2Conn.UploadAttachmentContent(_attachment.Id, GetFile("Report1.pdf"));
}
}