protected override Expression CreateCustomExpression(MethodInfo method, object instance, IEnumerable <Expression> subexpr, ExpressionBuilderParameters parameters, Type subType)
{
Expression op = base.CreateCustomExpression(method, instance, subexpr, parameters, subType);
Type rt = Nullable.GetUnderlyingType(method.ReturnType) ?? method.ReturnType;
return(FilterElement.OperatorExpression(
op,
Expression.Constant(Convert.ChangeType(FilterElement.Distance, rt, CultureInfo.InvariantCulture), method.ReturnType)
));
}
