Error in reading XML containing question mark: data at the root level is invalid

When the XML string is loaded using the loadxml method of xmldocumentData at the root level is invalid. It turns out that there are three question marks at the beginning of the read XML.

It turns out that the encoding is not specified when the XML file is written.: <? XML version = "1.0" encoding = "UTF-8"?>

So the encoding problem causes garbled characters in XML.

 

Solution:

1. The above header must exist when writing data.

2. There is no way to filter out the garbled characters before <root>,System. Text. regularexpressions. RegEx. Replace (xmlstring, "^ [^ <] + ","")