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BOOK: Professional Business Connectivity Services in SharePoint 2010 by Scot Hillier, Brad Stevenson
This is the forum to discuss the Wrox book Professional Business Connectivity Services in SharePoint 2010 by Scot Hillier, Brad Stevenson; ISBN: 978-0-470-61790-8
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Old February 1st, 2013, 02:45 PM
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Default AddDependentLookup and external list lookup columns.

So I have an external content type called Parts. I have created a site column that is a lookup field based on the external list.
The column works great.
Here is the CAML for the external list lookup column.

      DisplayName="Part Lookup"
      Group="BCS Lookup"
I have attempted through CAML unsuccessfully (long ago) to add a projected field to this lookup column. This field is the sPartCode field in the ECT.

I can, using the SharePoint GUI add this projected field and it works. I want to add this programmatically rather than manually through the GUI.

I used the following site to come up with something that could add the projected column (using AddDependentLookup) as follows:

When I execute the "AddDependentLookup" line of code, I get this error message.
Microsoft.SharePoint.SPException was unhandled
  Message=The primary lookup field is not valid.  It may have been deleted or is not a primary lookup field.   Create a new lookup field referencing another primary lookup field that is valid.
       at Microsoft.SharePoint.SPFieldCollection.AddDependentLookupInternal(String displayName, Guid primaryLookupFieldId, String strShowField, SPAddFieldOptions op)
       at Microsoft.SharePoint.SPFieldCollection.AddDependentLookup(String displayName, Guid primaryLookupFieldId)
       at AddProjectedColumn.Program.Main(String[] args) in C:\source\Blackcreek\SharePointUtils\AddProjectedColumn\AddProjectedColumn\AddProjectedColumn\Program.cs:line 42
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
Here is the code I'm attempting to use.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint;

namespace AddProjectedColumn
    class Program

        private static string _sSiteURL = @"http://myserver/sites/renewals2";

        static void Main(string[] args)
            using (SPSite site = new SPSite(_sSiteURL))
                using (SPWeb web = site.OpenWeb())
                    Console.WriteLine("Site: " + site.Url);
                    // do stuff here.

                    SPList lookupList = web.Lists.TryGetList("Part List");
                    SPList list = web.Lists.TryGetList("TestList");

                    // Get the field object of the original field.
                    SPField partLookup = null;
                    partLookup = list.Fields.TryGetFieldByStaticName("Part_Lookup");

                    Console.WriteLine(String.Format("The field name is : {0}", partLookup.ToString()));

                    if  (partLookup != null)
                        string lsProjectedCol = web.Fields.AddDependentLookup("Part_Lookup-SKU", partLookup.Id);
                        SPFieldLookup projectedCol = (SPFieldLookup)web.Fields.GetFieldByInternalName(lsProjectedCol);
                        projectedCol.LookupField = lookupList.Fields["sPartCode"].InternalName;




Any ideas where I'm going wrong here?
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