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    <p>Why is it important to distinguish between a string containing '\r\n' and an empty string? In general, when using data contract serialization you don't care about the XML format/structure or how it stores the data as long as it "round-trips" correctly.</p> <p>This is how we use it:</p> <pre><code>DataContractSerializer serializer = CreateSerializer(this.GetType()); XmlWriterSettings settings = new XmlWriterSettings(); settings.Indent = true; using (XmlWriter writer = XmlTextWriter.Create(sb, settings)) { serializer.WriteObject(writer, this); writer.Flush(); } internal static T Deserialize&lt;T&gt;(Stream stream) { DataContractSerializer serializer = CreateSerializer(typeof(T)); return (T)serializer.ReadObject(stream); } public static DataContractSerializer CreateSerializer(Type type) { DataContractSerializer serializer = new DataContractSerializer(); return serializer; } </code></pre> <p>If I'm not mistaken, characters like linefeeds are not allowable characters within an XML value and would need to be either encoded or contrained in a CDATA section. The data contract serializer does neither of these. Tools like XML Notepad are changing the data because they realize these aren't legal characters and removing them to create conformant XML.</p> <p>It actually shouldn't be surprising that string data can be returned differently between a binary serializer and an XML serializer. The binary serializer will serialize the exact binary representation of the data bit for bit and has no "rules" on what are legal characters, etc.</p>
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    1. POHow to serialize a string holding nothing but "\r\n" to XML correctly?
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    1. USScott Dorman
    1. USScott Dorman
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    1. CO>>> "Why is it important to distinguish" - sometimes it isn't, sometimes it is. Migrating from BinaryFormatter, it was a surprise to realise that strings can now come back different to how they were saved. >>> "you don't care about the XML format/structure" - indeed; however seeing XML Notepad change our data is worrying and makes me wonder what we're doing wrong.
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      1. USRoman Starkov
    2. CO@romkyns: Updated my answer to address your concerns. Overall I don't think you are doing anything "wrong" as long as your objects deserialize correctly. I still don't see why you need to distinguish between an empty line ('\r\n') and an empty string.
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      1. USScott Dorman
    3. COI understand the issue as well. If you xml serialize a string over the wire that has CRLF's in it, the recipient will get just LF's. It does not round-trip!
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      1. USCory R. King
 

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