xml通配符

解析xml字符串
< -> &lt;
> -> &gt;
" -> &quot;
' -> &apos;
& -> &amp;

1. 利用string.Replace() 五次替换

string xml = "<node>it's my \"node\" & i like it<node>";
encodedXml = xml.Replace("&", "&amp;").Replace("<", "&lt;").Replace(">", "&gt;").Replace("\"", "&quot;").Replace("'", "&apos;");
// RESULT: &lt;node&gt;it&apos;s my &quot;node&quot; &amp; i like it&lt;node&gt;



2. 利用System.Web.HttpUtility.HtmlEncode() 方便

string xml = "<node>it's my \"node\" & i like it<node>";
string encodedXml = HttpUtility.HtmlEncode(xml);
// RESULT: &lt;node&gt;it's my &quot;node&quot; &amp; i like it&lt;node&gt;

3. 利用System.Security.SecurityElement.Escape() 不常用

string xml = "<node>it's my \"node\" & i like it<node>";
string encodedXml = System.Security.SecurityElement.Escape(xml);
// RESULT: &lt;node&gt;it&apos;s my &quot;node&quot; &amp; i like it&lt;node&gt


4. 利用 System.Xml.XmlTextWriter

string xml = "<node>it's my \"node\" & i like it<node>";
using (XmlTextWriter xtw = new XmlTextWriter(@"c:\xmlTest.xml", Encoding.Unicode))
{
xtw.WriteStartElement("xmlEncodeTest");
xtw.WriteAttributeString("testAttribute", xml);
xtw.WriteString(xml);
xtw.WriteEndElement();
}
// RESULT:
/*
<xmlEncodeTest testAttribute="&lt;node&gt;it's my &quot;node&quot; &amp; i like it&lt;node&gt;">
&lt;node&gt;it's my "node" &amp; i like it&lt;node&gt;
</xmlEncodeTest>
*/