Encode multiline strings as multiline strings.

[Pxtl]

The raw xml is difficult to read with multline strings, as the strings get encoded as hideous xml escapes.

Use "OmitXmlDeclaration = true," in XmlWriterSettings to correct.

Unit test demonstrating loopback in this case:

var teststr = @"
this
<is>
  a

    test
    .
";
var ms = new MemoryStream();
var writer = XmlWriter.Create(ms, new XmlWriterSettings()
{
    NewLineOnAttributes = true,
    Indent = true,
    IndentChars = "  ",
    NewLineChars = Environment.NewLine,
    OmitXmlDeclaration = true,
    NewLineHandling = NewLineHandling.None
});
writer.WriteStartElement("root");
writer.WriteAttributeString("multilineTest", teststr);
writer.WriteEndElement();
writer.Flush();
var asStr = System.Text.Encoding.UTF8.GetString(ms.GetBuffer());
asStr.Dump();

XmlReader reader = new XmlTextReader(new MemoryStream(Encoding.UTF8.GetBytes(asStr)));
reader.Read();
Assert.AreEqual(reader.GetAttribute("multilineTest"), teststr);

[mirhagk]

It looks like the NewLineHandling = NewLineHandline.None is actually the relevant part. Doing OmitXmlDeclaration = false seems to output the multilineTest attribute identically (just make sure to do 2 more reads to skip past the declaration and the whitespace).

The NewLineHandling seems to roundtrip fine, so I'm totally fine with adding that (definitely will make it easier to deal with multi line strings) and if for some reason in the future there's issues caused by it (some naive parser minifying it) we can add an option to turn this back on.

[Pxtl]

Blarg, yes, I copypasta'd the wrong line. Yes, NewLineHandline.None.