c# - Create dynamic Linq queries for XML -


i want build query builder user has opportunity input different conditions "id > 10" "and id < 40".

also user can select different xml elements wants display. example can select display id element , code element.

i have 2 lists 1 filters user selects , 1 elements wants show. problem don't know how add logical operator "&&" , "||" linq clause.

also not know how dynamically generate select statement include fields user selected.

here have far : 

xdocument doc = xdocument.load(xmlfile); var query = doc.descendants("student");  // iterate through conditions , add them linq query foreach(whereconditions wcon in whereconditions) {     query = query.where(x => (int)x.element(wcon.selectedfield) >   int32.parse(wcon.comparisonvalue)); }  foreach(string selectedcolumns in selectedfields) {     xelement x;      x = doc.root.element("students").element("student");     query = query.select(x =>(new {selectedcolumns = x.element(selectedcolumns).value})); }


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