ExpressionEvaluator

Expression Visitor that takes the nominated subtrees of the ExpressionNominator, compiles and evaluates them and then replaces each subtree by the corresponding value.

ExpressionEvaluator.Eval also is able to evaluate a complete expression tree and return the value (or throw an exception if it's not possible to do so).

public class ExpressionEvaluator : ExpressionVisitor
{
   public static Expression PartialEval(Expression exp);

   public static object Eval(Expression expression);
}

In order to avoid compilation of too many sub-expressions, the ExpressionEvaluator catches the compilations for common sub-expressions:

• Instance Mebers
• Static Members
• Instance methods with no arguments.
• Static methods with no arguments.
• Extension methods with no arguments.