C# 使用 XmlReader 获取额外的空白值，但不使用 XmlDocument

Question

我有一个情况我不太明白。阅读以下 XML 时:

<?xml version="1.0" encoding="utf-8" ?>
<Root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <Countries>
      <Country>
        <CountryCode>CN</CountryCode>
        <CurrentStatus>Active</CurrentStatus>
      </Country>
    </Countries>

    <Countries>
      <Country>
        <CountryCode>AU</CountryCode>
        <CurrentStatus>Cancelled</CurrentStatus>
      </Country>
      <Country>
        <CountryCode>CN</CountryCode>
        <CurrentStatus>Cancelled</CurrentStatus>
      </Country>
      <Country>
        <CountryCode>US</CountryCode>
        <CurrentStatus>Active</CurrentStatus>
      </Country>
    </Countries>

    <Countries xsi:nil="true" />
</Root>

使用以下代码:

//No whitespace
string xml = File.ReadAllText(fileInfo.FullName);
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xml);
string json1 = JsonConvert.SerializeXmlNode(xmlDoc);

//With whitespace
XmlDocument doc = new XmlDocument();
XmlReaderSettings settings = new XmlReaderSettings();
settings.ConformanceLevel = ConformanceLevel.Fragment;

using (XmlReader reader = XmlReader.Create(fileInfo.FullName, settings))
{
    while (reader.Read())
    {
        if (reader.NodeType == XmlNodeType.Element)
        {
            XmlNode node = doc.ReadNode(reader);
            string json2 = JsonConvert.SerializeXmlNode(node);
        }
    }
}

我得到的 json 看起来像这样:

json1:

{"?xml":{"@version":"1.0","@encoding":"utf-8"},"Root":{"@xmlns:xsi":"http://www.w3.org/2001/XMLSchema-instance","Countries":[{"Country":{"CountryCode":"CN","CurrentStatus":"Active"}},{"Country":[{"CountryCode":"AU","CurrentStatus":"Cancelled"},{"CountryCode":"CN","CurrentStatus":"Cancelled"},{"CountryCode":"JP","CurrentStatus":"Cancelled"},{"CountryCode":"SG","CurrentStatus":"Cancelled"},{"CountryCode":"US","CurrentStatus":"Active"}]},{"@xsi:nil":"true"}]}}

json2:

{"Root":{"@xmlns:xsi":"http://www.w3.org/2001/XMLSchema-instance","#whitespace":["\n ","\n ","\n ","\n"],"Countries":[{"#whitespace":["\n ","\n "],"Country":{"#whitespace":["\n ","\n ","\n
"],"CountryCode":"CN","CurrentStatus":"Active"}},{"#whitespace":["\n
","\n ","\n ","\n ","\n ","\n "],"Country":[{"#whitespace":["\n ","\n ","\n
"],"CountryCode":"AU","CurrentStatus":"Cancelled"},{"#whitespace":["\n ","\n ","\n
"],"CountryCode":"CN","CurrentStatus":"Cancelled"},{"#whitespace":["\n ","\n ","\n
"],"CountryCode":"JP","CurrentStatus":"Cancelled"},{"#whitespace":["\n ","\n ","\n
"],"CountryCode":"SG","CurrentStatus":"Cancelled"},{"#whitespace":["\n ","\n ","\n
"],"CountryCode":"US","CurrentStatus":"Active"}]},{"@xsi:nil":"true"}]}}

为什么 XmlReader 会生成空格，而 XmlDocument 不会？考虑到 XML 值，我认为它们不应该存在。

Answer 1

解决方法:

settings.IgnoreWhitespace = true;

感谢@HenkHolterman 和@finrod。