c# - Create Expression for List.Any clause -

consider hierarchy of classes.

class event {     public attendees[] attendeeslist; }  class attendees {     public complexproperty property;     public object value; }  class complexproperty {  }  class program {     static void main(string[] args)     {         // there constants.         complexproperty constproperty = new complexproperty();         object constvalue = 5;          // consider linq query:         event evnt = new event();          var result = evnt.attendeeslist.any((attnds) => attnds.property == constproperty && attnds.value == constvalue);           // want create expression tree above linq query. need this:         parameterexpression parameter = expression.parameter(typeof(attendees));         expression left = expression.property(parameter, typeof(complexproperty).getproperty("property"));         // complete piece.......      } } 

i want create linq.expressions.expression evnt.attendeeslist.any((attnds) => attnds.property == constproperty && attnds.value == constvalue); linq query. how query collection linq.expressions looks similar, have any in linq expression.

please help.

this give start:

parameterexpression parameter = expression.parameter(typeof(attendees)); expression left = expression.equal(expression.property(parameter, "property"), expression.constant(constproperty));  var objtype = constvalue == null ? typeof(object) : constvalue.gettype(); var convertleft = expression.convert(expression.property(parameter, "value"), objtype); var convertright = expression.convert(expression.constant(constvalue), objtype); expression right = expression.equal(convertleft, convertright); expression joined = expression.and(left, right);  var anymethod = typeof(queryable).getmethods().where(m => m.name=="any" && m.getparameters().count() == 2).first().makegenericmethod(typeof(attendees)); var call = expression.call(anymethod, expression.constant(evnt.attendeeslist, typeof(iqueryable<attendees>)), expression.lambda(joined, parameter)); 

i changed value type int ease of use. if want keep object, need add expression.convert() call in right expression.