/// <summary>
/// Returns an expression for the Count method call (no predicate) e.g. q => q.Count(). <![CDATA[ Expression<Func<IQueryable<Account>, double>> countExpression ]]>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="field"></param>
/// <returns></returns>
public static Expression <Func <IQueryable <T>, int> > BuildCountExpression <T>() where T : class
{
ParameterExpression param = Expression.Parameter(typeof(IQueryable <T>), "q");
return(Expression.Lambda <Func <IQueryable <T>, int> >(param.GetCountMethodCall(), param));
}