B2016-115 the comparison of the contents of RO.FST files would also be seen as different (and loading into memory) even when user created a new RO.fst without making any RO changes. We needed to skip past the RO.FST header information in the file which contains the date/time the FST was created. Also needed to do a garbage collection.

PROMS/VEPROMS.CSLA.Library/Extension/ROFSTExt.cs

@@ -1079,6 +1079,41 @@ namespace VEPROMS.CSLA.Library
 				throw new DbCslaException("Error on RoFstInfoList.GetBySize", ex);
 			}
 		}
+		public static bool ROFstDiffBySize(string rofstPath, int roDbID, int len)
+		{
+			try
+			{
+				bool isDifferent = false;
+				using (ROFstInfoList tmp = GetBySize(roDbID, len))
+				{
+					if (tmp.Count > 0)
+					{
+						// B2017-078  WCN users with Read only access to the RO FST file where not able to open the file for reading when
+						//            another user was accessing the file. Changed FileShare from Read to ReadWrite
+						FileStream fsIn = new FileStream(rofstPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+						// Create an instance of StreamReader that can read characters from the FileStream.
+						BinaryReader r = new BinaryReader(fsIn);
+						byte[] ab = r.ReadBytes((int)fsIn.Length);
+						r.Close();
+						fsIn.Close();
+						foreach (ROFstInfo irofst in tmp)
+						{
+							// compare contents by comparing each byte.
+							for (int i = 20; i < len; i++) // this skips past RO.FST header which has the FST creation date/time
+								if (ab[i] != irofst.ROLookup[i]) isDifferent = true;
+							irofst.Dispose();
+							if (isDifferent) break;
+						}
+					}
+				}
+				GC.Collect();
+				return isDifferent;
+			}
+			catch (Exception ex)
+			{
+				throw new DbCslaException("Error on RoFstInfoList.ROFstDiffBySize", ex);
+			}
+		}
 		private void DataPortal_Fetch(RoFstSizeCriteria criteria)
 		{
 			this.RaiseListChangedEvents = false;