structs.Sort(new Comparison<Model.TableStruct>((t1, t2) => 
            {
                var i = 0;
                var n1 = t1.ColName.ToLower();
                var n2 = t2.ColName.ToLower();

                while (n1.Length > i + 1 && n2.Length > i + 1 && n1[i] == n2[i])
                {
                    i++;
                }

                if (n1[i] > n2[i])
                    return 1;
                if (n1[i] < n2[i])
                    return -1;                
                if (n1.Length < n2.Length)
                    return -1;
                if (n1.Length > n2.Length)
                    return 1;

                return 0;
            }));

 public int CompareTo(object obj)
        {
            if (obj is TableStruct)
            {
                var t1 = this;
                var t2 = (TableStruct)obj;

                var i = 0;
                var n1 = t1.ColName.ToLower();
                var n2 = t2.ColName.ToLower();

                while (n1.Length > i + 1 && n2.Length > i + 1 && n1[i] == n2[i])
                {
                    i++;
                }

                if (n1[i] > n2[i])
                    return 1;
                if (n1[i] < n2[i])
                    return -1;
                if (n1.Length < n2.Length)
                    return -1;
                if (n1.Length > n2.Length)
                    return 1;

                return 0;
            }
            else
            {
                throw new Exception("不能比较");
            }
        }