Counting pages, records, etc. #153

FetchXmlBuilder/AppCode/QueryInfo.cs

@@ -1,13 +1,72 @@
 using Microsoft.Xrm.Sdk;
 using Microsoft.Xrm.Sdk.Query;
+using Rappen.XRM.Helpers.FetchXML;
+using System;
+using System.Xml;
 
 namespace Rappen.XTB.FetchXmlBuilder.AppCode
 {
     internal class QueryInfo
     {
-        public QueryBase Query;
+        private QueryBase query;
+        private EntityCollection result;
+        internal int PageSize = 0;
+        internal int PageNo = 1;
+        internal int Pages = -1;
+        internal int RecordFrom = -1;
+        internal int RecordTo = -1;
+
         public string QuerySignature;
         public string AttributesSignature;
-        public EntityCollection Results;
+
+        public QueryBase Query
+        {
+            get { return query; }
+            set
+            {
+                query = value;
+                if (query is FetchExpression fetch)
+                {
+                    var fetchdoc = new XmlDocument();
+                    fetchdoc.LoadXml(fetch.Query);
+                    if (fetchdoc.SelectSingleNode("fetch") is XmlElement fetchnode)
+                    {
+                        if (fetchnode.AttributeInt("count") is int count)
+                        {
+                            PageSize = count;
+                        }
+                        if (fetchnode.AttributeInt("page") is int page)
+                        {
+                            PageNo = page;
+                        }
+                    }
+                }
+            }
+        }
+
+        public EntityCollection Results
+        {
+            get { return result; }
+            set
+            {
+                result = value;
+                if (!string.IsNullOrEmpty(result.PagingCookie))
+                {
+                    var cookdoc = new XmlDocument();
+                    cookdoc.LoadXml(result.PagingCookie);
+                    if (cookdoc.SelectSingleNode("cookie") is XmlElement cookie &&
+                        cookie.AttributeInt("page") is int page)
+                    {
+                        PageNo = page;
+                    }
+                }
+                if (result.TotalRecordCount > -1 && PageSize > 0)
+                {
+                    Pages = (int)Math.Ceiling((decimal)result.TotalRecordCount / PageSize);
+                }
+                RecordFrom = 1 + (PageNo - 1) * PageSize;
+                RecordTo = RecordFrom - 1 + result.Entities.Count;
+            }
+        }
     }
 }