取得某个符号之间的字符

    string aa = "jjjj[kkkk中国]不[国不能]asfsd[fsdf国家]gggg";
   string [] ll = new string[10];
   char [] ii = new char[2];
   ii[0] = '[';
   ii[1] = ']';
   ll = aa.Split(ii);
   ArrayList array = new ArrayList();
   for(int i=0;i<ll.Length;i++)
   {
    if(i==ll.Length-1){break;}
    array.Add(ll[i+1]);
    i++;    
   }

   for(int j=0;j<array.Count;j++)
   {
    label1.Text += (string)array[j];
   }