Merge pull request #1484 from bonjune/rfc-4180

Author: cartermp

src/FSharp.Data.Csv.Core/CsvRuntime.fs

@@ -447,6 +447,11 @@ type CsvFile<'RowType>
 
         use writer = writer
 
+        // RFC 4180 (https://www.rfc-editor.org/rfc/rfc4180)
+        // 2.  Definition of the CSV Format
+        // Each record is located on a separated line, delimited by a line break CRLF
+        writer.NewLine <- "\r\n"
+
         let nullSafeguard str =
             match str with
             | null -> String.Empty

tests/FSharp.Data.Tests/CsvProvider.fs

@@ -124,7 +124,7 @@ let ``Can create type for small document``() =
 
 [<Test>]
 let ``CsvFile.Rows is re-entrant if the underlying stream is``() =
-  let csv = CsvFile.Load(Path.Combine(__SOURCE_DIRECTORY__, "Data/SmallTest.csv"))  
+  let csv = CsvFile.Load(Path.Combine(__SOURCE_DIRECTORY__, "Data/SmallTest.csv"))
   let twice = [ yield! csv.Rows; yield! csv.Rows ]
   twice |> Seq.length |> should equal 6
 
@@ -465,7 +465,8 @@ let ``Parse single row with trailing newline``() =
 let ``Parse two rows``() =
   let rows = SimpleWithStrCsv.ParseRows("false,abc, 31\ntrue, def, 42")
   rows.Length |> should equal 2
-  (new SimpleWithStrCsv(rows)).SaveToString() |> should equal ("Column1,ColumnB,Column3" + Environment.NewLine + "false,abc,31" + Environment.NewLine + "true, def,42" + Environment.NewLine)
+  (new SimpleWithStrCsv(rows)).SaveToString() |> should equal ("Column1,ColumnB,Column3" + "\r\n" + "false,abc,31" + "\r\n" + "true, def,42" + "\r\n")
+  // (new SimpleWithStrCsv(rows)).SaveToString() |> should equal ("Column1,ColumnB,Column3" + Environment.NewLine + "false,abc,31" + Environment.NewLine + "true, def,42" + Environment.NewLine)
 
 let [<Literal>] csvWithDataEndingWithSeparator = """
 Name|Company |Email|Password