下面是代码示例，可以实现上述功能。

(defun c:countPolyline (/ ss objects data result)
  (setq ss (ssget "X" '((0 . "LWPOLYLINE"))))
  (if ss
    (progn
      (setq objects (vl-remove-if-not 'vla-get-Linetype
                                      (mapcar 'vlax-ename->vla-object
                                              (vl-remove-if-not 'listp
                                                               (mapcar 'cadr
                                                                       (ssnamex ss))))))      
      (setq data (mapcar (lambda (x)
                            (list (vla-get-Linetype x)
                                  (vlax-curve-Stats (vlax-ename->vla-object (vla-get-Entity x)))))
                          objects))
      (setq result
            (sort (apply 'append
                         (mapcar (lambda (x)
                                   (list (car x) (apply '+ (mapcar 'cadr x)))))
                                 (mapcar (lambda (x)
                                           (remove-duplicates (mapcar 'car x)
                                                              :test 'string-equal)))
                                         (mapcar 'cdr
                                                 (group-objects-by 'car data)))
                                 )
                  (lambda (x y) (string< (car x) (car y))))))
    (princ "\n没有找到多段线")
  )
  (if result
    (progn
      (princ "\n多段线按线型求和：")
      (foreach item result
        (princ (strcat "\n线型：" (car item) "  数量：" (rtos (cadr item) 2 0))))
    )
    (princ "\n没有找到多段线")
  )
  (princ)
)

(defun group-objects-by (field list / hash)
  (setq hash (mapcar (lambda (x) (list (funcall field x) x)) list))
  (mapcar (lambda (k) (mapcar 'cdr (vl-remove-if-not (lambda (x) (equal k (car x))) hash))) 
          (remove-duplicates (mapcar 'car hash) :test 'equal)))

该代码包含了 c:countPolyline 函数和 group-objects-by 函数。 c:countPolyline 函数通过选择多段线实体并计算他们的数量并按线型排序进行求和。 group-objects-by 函数用于将对象分组并按字段进行排序。

运行该函数会返回多段线数量总和以及每个线型的数量。