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XmlDocument incorrectly serializes elements with an empty-string child text node when pretty-printing #41574

mklement0 opened this issue Oct 5, 2019 · 0 comments


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commented Oct 5, 2019

System.Xml.XmlDocument - unlike System.Xml.Linq.XDocument - incorrectly serializes an element that has an empty-string child text node when producing pretty-printed output.

(The idea behind creating an empty-string child text node - as opposed to using a truly empty (childless) element - is to force serialization of such an element in the <tag></tag> form, as opposed to in the self-closing empty-tag form (<tag />).
For a real-world scenario and manifestation of this bug, see this StackOverflow question.)

Steps to reproduce:

using System;
using System.Xml;
using System.IO;

public static class Program
  public static void Main()

    var xd = new XmlDocument();

    // Add an empty-string child text node to <Elem>
    xd.DocumentElement.FirstChild.InnerText = "";



Expected output:


That is, the element should serialize in the <tag>...</tag> form, with the empty string as the (implied) inner text.

Actual output:


That is, the element unexpectedly serialized across two lines, which introduced extraneous whitespace as the value of the <Elem> element (the value of its child text node).

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