string escape into XML-Attribute

Question

I had a look at string escape into XML and found it very useful.

I would like to do a similar thing: Escape a string to be used in an XML-Attribute.

The string m

Answer 1

public static string XmlEscapeAttribute(string unescaped)
{
    if (string.IsNullOrEmpty(unescaped))
        return unescaped;

    var attributeString = new XAttribute("n", unescaped).ToString();

    // Extract the string from the text like: n="text".
    return attributeString.Substring(3, attributeString.Length - 4);
}

This solution is similar to the one one proposed by @Mathias E. but it uses LINQ to XML rather than XmlDocument so should be faster.

The SecurityElement.Escape() solution has a couple of problems. First it doesn't encode new lines so that has to be done as an additional step. Also, it encodes apostrophes as ' which is not correct in an attribute value per the XML spec.

Inspiration for my solution came from this post.