c# - LINQ TO ENTITIES USING PREDICATE(Func(x,bool) Not Working -

i have clause predicate fetching records .now if use same in clause predicate(ie func(x,bool) ) returns no records.my impression both equivalent. - see below

var nonpredicate=this.objectset.where(x=>!string.isnullorempty(x.email) && x.email.contains("and")).tolist();  func<model,bool) clause=x=> x=>!string.isnullorempty(x.email) && x.email.contains("and");  var predicateres=this.objectset.where(clause).tolist(); 

i expected same results in both cases -but first produces 29 record result , second 0 records.

any great

thanks

linq entitites uses expression<func<?,?>> it's query methods. lambda expressions automatically coersed expression (expression<func<?,?>>) or delegate (func<?,?>) depending on type of variable or argument stored in.

// inline expression var nonpredicate = this.objectset.where(x =>     !string.isnullorempty(x.email) && x.email.contains("and")).tolist();  // delegate type func<model,bool> clausedelegate = x =>     !string.isnullorempty(x.email) && x.email.contains("and");  // expression type expression<func<model,bool>> clauseexpr = x =>     !string.isnullorempty(x.email) && x.email.contains("and");  var predicateres = this.objectset.where(clauseexpr).tolist(); 

expressions object representation of lambda, allows library translate sql communication database. same not possible delegates, since structure compiled il or machine code.