Complete previous change to DoQuery

Handle cases of no query string properly, and support column lists.
Also remove a VS2015ism for backwords compatibility

Author: Jareth Hein

Intuit.QuickBase.Client/QTable.cs

@@ -181,6 +181,7 @@ private void _doQuery(DoQuery qry)
                 //split into smaller queries automagically
                 List<string> optionsList = new List<string>();
                 string query = qry.Query;
+                string collist = qry.Collist;
                 int maxCount = 0;
                 int baseSkip = 0;
                 if (!string.IsNullOrEmpty(qry.Options))
@@ -204,10 +205,15 @@ private void _doQuery(DoQuery qry)
                 }
                 if (maxCount == 0)
                 {
-                    var doQuery = new DoQueryCount.Builder(Application.Client.Ticket, Application.Token, Application.Client.AccountDomain, TableId)
-                        .SetQuery(query)
-                        .Build();
-                    var cntXml = doQuery.Post().CreateNavigator();
+                    DoQueryCount dqryCnt;
+                    if (string.IsNullOrEmpty(query))
+                        dqryCnt = new DoQueryCount.Builder(Application.Client.Ticket, Application.Token, Application.Client.AccountDomain, TableId)
+                            .Build();
+                    else
+                        dqryCnt = new DoQueryCount.Builder(Application.Client.Ticket, Application.Token, Application.Client.AccountDomain, TableId)
+                            .SetQuery(query)
+                            .Build();
+                    var cntXml = dqryCnt.Post().CreateNavigator();
                     maxCount = int.Parse(cntXml.SelectSingleNode("/qdbapi/numMatches").Value);
                 }
                 int stride = maxCount/2;
@@ -216,18 +222,26 @@ private void _doQuery(DoQuery qry)
                 {
                     List<string> optLst = new List<string>();
                     optLst.AddRange(optionsList);
-                    optLst.Add($"skp-{fetched + baseSkip}");
-                    optLst.Add($"num-{stride}");
+                    optLst.Add("skp-" + (fetched + baseSkip));
+                    optLst.Add("num-" + stride);
                     string options = string.Join(".",optLst);
-                    var doQuery = new DoQuery.Builder(Application.Client.Ticket, Application.Token, Application.Client.AccountDomain, TableId)
-                        .SetQuery(query)
-                        .SetCList("a")
-                        .SetOptions(options)
-                        .SetFmt(true)
-                        .Build();
+                    DoQuery dqry;
+                    if (string.IsNullOrEmpty(query))
+                       dqry = new DoQuery.Builder(Application.Client.Ticket, Application.Token, Application.Client.AccountDomain, TableId)
+                           .SetCList(collist)
+                           .SetOptions(options)
+                           .SetFmt(true)
+                           .Build();
+                    else
+                       dqry = new DoQuery.Builder(Application.Client.Ticket, Application.Token, Application.Client.AccountDomain, TableId)
+                           .SetQuery(query)
+                           .SetCList(collist)
+                           .SetOptions(options)
+                           .SetFmt(true)
+                           .Build();
                     try
                     {
-                        XPathNavigator xml = doQuery.Post().CreateNavigator();
+                        XPathNavigator xml = dqry.Post().CreateNavigator();
                         if (fetched == 0) LoadColumns(xml);
                         LoadRecords(xml);
                         fetched += stride;

Intuit.QuickBase.Core/DoQuery.cs

@@ -27,6 +27,7 @@ public class DoQuery : IQObject
         private readonly IQUri _uri;
         private readonly string _options;
         private readonly string _query;
+        private readonly string _collist;
 
         public class Builder
         {
@@ -129,6 +130,7 @@ private DoQuery(Builder builder)
                 .Build();
             _options = builder.Options;
             _query = builder.Query;
+            _collist = builder.CList;
             _doQueryPayload = new ApplicationTicket(_doQueryPayload, builder.Ticket);
             _doQueryPayload = new ApplicationToken(_doQueryPayload, builder.AppToken);
             _doQueryPayload = new WrapPayload(_doQueryPayload);
@@ -145,6 +147,11 @@ public string Query
             get { return _query; }
         }
 
+        public string Collist
+        {
+           get { return _collist; }
+        }
+
         public string XmlPayload
         {
             get