c# - Remove Insignificant Whitespace From Xml Document -

i've got xml file contains both significant , insignificant whitespace. read file in , write file out disk, removing insignificant whitespace. when considering significant vs insignificant whitespace, want make sure spaces within mixed content elements (as defined schema) maintained. how can using c#?

based on this article read, sounded might need use validating xml reader reader know elements contain mixed content per schema. below 1 example of code tried did not maintain significant whitespace between elements within parent element containing mixed content.

xmldocument doc = new xmldocument(); doc.preservewhitespace = true; using (xmltextreader rdr = new xmltextreader(xmlfilepath1)) {     rdr.whitespacehandling = whitespacehandling.significant;     xmlschemaset sc = new xmlschemaset();     sc.add(null, @"c:\my-schema.xsd");     doc.load(xmlreader.create(rdr, new xmlreadersettings() { validationtype = system.xml.validationtype.schema, schemas = sc }));     using (xmltextwriter writer = new xmltextwriter(xmlfilepath2, encoding.utf8))     {         writer.formatting = formatting.none;         doc.save(writer);     } } 

below example of xml maintain whitespace. expecting whitespace between 2 inline tag elements maintained. para defined in schema having mixed content.

<para>i have bunch of text here <inlinetag attrib="a"/> <inlinetag attrib="b"/></para> 

here simple example of whitespace want remove. in example, markup came printy printed xml document tabs or spaces in front of elements , line breaks after them. want keep whitespace inside para not outside of it.

  <entry colname="col2">     <para>lorem ipsum dolor sit amet, et nulla diam.<inlinetag value="a"/> <inlinetag value="b"/></para>   </entry> 

i did find solution writing significant whitespace, although straight-forward had hoped. below example code borrows heavily mark fussell's blog. modification made writeshallownode method remove case statement xmlnodetype.whitespace. causes insignificant whitespace removed output.

using (var xwmodifiedxml = xmlwriter.create(xmlfilepath1)) {     using (var sr = new stringreader(file.readalltext(xmlfilepath2)))     {         xmlschemaset sc = new xmlschemaset();         sc.add(null, @"c:\my-schema.xsd");         using (var xrmodifiedxml = xmlreader.create(sr, new xmlreadersettings() { validationtype = system.xml.validationtype.schema, schemas = sc }))         {             bool readresult = xrmodifiedxml.read();             while (readresult)             {                 writeshallownode(xrmodifiedxml, xwmodifiedxml);                 readresult = xrmodifiedxml.read();             }         }     } }  static void writeshallownode( xmlreader reader, xmlwriter writer ) {       if ( reader == null )       {             throw new argumentnullexception("reader");       }       if ( writer == null )       {             throw new argumentnullexception("writer");       }        switch ( reader.nodetype )       {             case xmlnodetype.element:                   writer.writestartelement( reader.prefix, reader.localname, reader.namespaceuri );                   writer.writeattributes( reader, true );                   if ( reader.isemptyelement )                   {                         writer.writeendelement();                   }                   break;             case xmlnodetype.text:                   writer.writestring( reader.value );                   break;             case xmlnodetype.significantwhitespace:                   // write significant whitespace                   writer.writewhitespace(reader.value);                   break;             case xmlnodetype.cdata:                   writer.writecdata( reader.value );                   break;             case xmlnodetype.entityreference:                   writer.writeentityref(reader.name);                   break;             case xmlnodetype.xmldeclaration:             case xmlnodetype.processinginstruction:                   writer.writeprocessinginstruction( reader.name, reader.value );                   break;             case xmlnodetype.documenttype:                   writer.writedoctype( reader.name, reader.getattribute( "public" ), reader.getattribute( "system" ), reader.value );                   break;             case xmlnodetype.comment:                   writer.writecomment( reader.value );                   break;             case xmlnodetype.endelement:                   writer.writefullendelement();                   break;       } }