Merge Process Instance

string MergeProcessInstances(IWFWorkflowService svc, string[]
processInstanceIDs)
	{
    IWFWorkflowService svc = GetWorkflowService();

    // suspends all of process instances to be merged.
    foreach (string id in processInstanceIDs)
        {
        svc.SuspendProcInst(id);
        }

    // query process instances
    string inExpr = ShUtil.Merge(processInstanceIDs, true);
    WFQueryExpr queryExpr = new WFQueryExpr("PROC_INST_ID", SQLExpr.IN,
    WFAny.Create(inExpr), true);
    WFBaseProcessInstance[] pis = svc.QueryProcInsts(queryExpr);

    // merge custom attributes
    NameValue[] mergedCustomAttributes = GetMergeCustomAttributes(api, pis);
    string procInstID = UUID.GetID();
    string procInstName = pis[0].DefName + "_" + DateTime.Now.Tostring()
    + " - Merged";
    string workObjectID = procInstID + " - Merged";
           
    WFProcessMergingInstruction instruction = new
    WFProcessMergingInstruction();
    instruction.MergingProcessInstanceIDs = processInstanceIDs;
    instruction.MergedProcessInstance = new
    WFProcessMergingInstruction.MergedProcessParameter(
                  procInstID,
                  procInstName,
                  workObjectID,
                  null,
                  mergedCustomAttributes);
    instruction.Validate();
    return svc.MergeProcInsts(instruction);
	}

// sample code for merging custom attributes
private NameValue[] GetMergeCustomAttributes(IWFWorkflowService svc,
WFBaseProcessInstance[] pis)
	{
    List<string> workObjectIDs = new List<string>();
    foreach (WFBaseProcessInstance pi in pis)
        {
        workObjectIDs.Add(pi.WorkObjectID);
        }
    KeyValue[] items = svc.GetCustomAttrsEx(workObjectIDs.ToArray());
    Dictionary<string, System.Xml.XmlDocument> dss =
    new Dictionary<string, System.Xml.XmlDocument>();
    foreach (KeyValue item in items)
        {
        WFCustomAttributes ds = new WFCustomAttributes();
        ds.AttrXml = item.Value;
        System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
        xmlDoc.LoadXml(ds["//"] as string);
        dss[item.Key] = xmlDoc;
        }
    // master processInstanceID and workObjectID
    string masterProcessInstanceID = pis[0].ProcInstID;
    string masterWorkObjectID = pis[0].WorkObjectID;
    System.Xml.XmlDocument masterXmlDoc = dss[masterWorkObjectID];
    System.Xml.XmlNamespaceManager nsm =
    ShUtil.GetNamespaces(masterXmlDoc);
    System.Xml.XmlNode titleNode =
    masterXmlDoc.SelectSingleNode("/pd:issueTracking/pd:issueTitle", nsm);
    titleNode.InnerText = "Title - Merged";
    System.Xml.XmlNode descriptionNode =
      
    masterXmlDoc.SelectSingleNode("/pd:issueTracking/pd:description", nsm);
    descriptionNode.InnerText = "Description - Merged";
    System.Xml.XmlNode parent =
    masterXmlDoc.SelectSingleNode("/pd:issueTracking/pd:Persons", nsm);
  
    // merge rest of children
    foreach (string key in dss.Keys)
        {
        if (key == masterWorkObjectID) continue;
        System.Xml.XmlDocument secondaryXmlDoc = dss[key];
        System.Xml.XmlNamespaceManager nsmgr =
        ShUtil.GetNamespaces(secondaryXmlDoc);
        System.Xml.XmlNode node =
        secondaryXmlDoc.SelectSingleNode("/pd:issueTracking/pd:Persons", nsmgr);
        parent.InnerXml += node.InnerXml;
        }
    return NameValue.Array("//", masterXmlDoc.OuterXml);
	}

#endregion