Fix File.Length to refresh file metadata and reflect updated file size (#1148)

* Fixed GxFileInfo.Length to refresh file metadata and reflect updated file size

* Fix unit test.

* Fix unit test.

* Removed the LastModified assertion from the test, as it can fail when the test executes too quickly and timestamps match unexpectedly.

Author: claudiamurialdo

dotnet/src/dotnetframework/GxClasses/Domain/GXFileIO.cs

@@ -260,6 +260,7 @@ public DateTime LastWriteTime
     {
         get
         {
+			_file.Refresh();
             return _file.LastWriteTime;
         }
     }
@@ -268,7 +269,8 @@ public long Length
     {
         get
         {
-            return _file.Length;
+			_file.Refresh();
+			return _file.Length;
         }
     }
 

dotnet/test/DotNetUnitTest/FileIO/FileIOTests.cs

@@ -1,6 +1,7 @@
 using System;
 using System.IO;
 using System.Runtime.InteropServices;
+using System.Threading;
 using DotNetUnitTest;
 using GeneXus.Configuration;
 using GeneXus.Printer;
@@ -154,6 +155,25 @@ public void ReportUtilAddPathWithIllegalCharacters()
 
 			Assert.Equal(name, fullPath);
 		}
+		[Fact]
+		public void Length_ShouldUpdate_WhenFileChanges()
+		{
+			GxFile gxFile = new GxFile(BaseDir);
+			gxFile.Source = "FileChanges.txt";
+			gxFile.Delete();
+
+			gxFile.Open(string.Empty);
+			gxFile.WriteLine("Initial content");
+			gxFile.Close();
 
+			long initialLength = gxFile.GetLength();
+
+			gxFile.Open(string.Empty);
+			gxFile.WriteLine("Additional content");
+			gxFile.Close();
+
+			long updatedLength = gxFile.GetLength();
+			Assert.NotEqual(initialLength, updatedLength);
+		}
 	}
 }