c# - Create Expression<Func<TEntity,object>> dynamically and call Aggregate to IQueryable<TEntity> -

i'd create expression<func<tentity, object>> later pass function parameter.

if use following function creating it...

public expression<func<tentity, object>> getinclude(string property) {     parameterexpression parameter = system.linq.expressions.expression.parameter(typeof(tentity));     system.linq.expressions.expression ppty = system.linq.expressions.expression.property(parameter, property);     lambdaexpression lambda = system.linq.expressions.expression.lambda(ppty, parameter);      return (expression<func<tentity, object>>)lambda; } 

... error @ runtime trying return result, saying type cannot converted object. example, if tentity purchases , want purchases.customers giving "customers" parameter.

on other hand, if function become generic like...

public expression<func<tentity, tdest>> getinclude<tdest>(string property) tdest: class, new() {         parameterexpression parameter = system.linq.expressions.expression.parameter(typeof(tentity));         system.linq.expressions.expression ppty = system.linq.expressions.expression.property(parameter, property);         lambdaexpression lambda = system.linq.expressions.expression.lambda(ppty, parameter);          return (expression<func<tentity, tdest>>)lambda; } 

... , calling generic method...

methodinfo methodinfoinclude = entityrepository.getmethod("getinclude"); object[] parameterstoincludearray = new object[] { "customers" };  //for testing  //get type of object obtained: assembly data = assembly.load("domain.entities"); type entitytypereferenced = data.gettypes() .where(t => t.isclass && t.namespace == "domain.entities" && t.name == "customers") //for testing .tolist<type>().first();  methodinfo methodinfogenericinclude = methodinfoinclude.makegenericmethod(entitytypereferenced); object include = methodinfogenericinclude.invoke(entityrepositoryinstance, parameterstoincludearray); 

... have no error , can include object. however, when call method requires expression<func<tentity, object>> parameter:

        object[] includes = { include };          methodinfo methodinfo = entityrepository.getmethod("getelementswithinclude");         object[] parameterstoincludefunctionarray = new object[] { includes };         object data = methodinfo.invoke(entityrepositoryinstance, parameterstoincludefunctionarray); 

... like...

public list<tentity> getelementswithinclude(expression<func<tentity,object>>[] includes) {     return this.applyincludes(this._context.createdbset<tentity>(), includes).asenumerable<tentity>().tolist(); } 

... the error object[] cannot converted expression<func<tentity,object>>[].

the aim calling function applyincludes this, having created expressions dynamically:

private iqueryable<tentity> applyincludes(idbset<tentity> entities, expression<func<tentity, object>>[] includes) {     return includes.aggregate(entities.asqueryable<tentity>(),         (entity, include) => entity.include(             ((memberexpression)include.body).member.declaringtype.equals(typeof(tentity)) ?             ((memberexpression)include.body).member.name :             include.body.tostring().replace(include.parameters[0].name + ".", "").replace("firstordefault().", "")             )); } 

any this, please???

thank much.