C#使用二分查找法判断指定字符的方法

private int sort_init(ref string[] chars, string str) //数组初始化{  string[] temp = str.Split(' ');  //temp.  chars = new string[temp.Count()];  int ndx = 0;  int last_empty_positon = 0;  foreach (string ch in temp)  {   ndx = last_empty_positon++;   chars[ndx] = ch;   if (ndx == 0) continue;   if (ch.Length == 0) continue;   while (chars[ndx].CompareTo(chars[ndx - 1]) < 0)   {    string s = chars[ndx];    chars[ndx] = chars[ndx - 1];    chars[ndx - 1] = s;    ndx--;    if (ndx == 0) break;   }  }  return 1;}

private bool isTheString(string str) //判断是否为指定字符{   int end = stopChar.Length - 1;   int begin = 0;   while (end - begin > 1)   {    int mid = (end + begin) / 2;    if (stopChar[mid].CompareTo(str) > 0)     end = mid;    else if (stopChar[mid].CompareTo(str) < 0)     begin = mid;    else     return true;   }   if (stopChar[end].CompareTo(str) == 0 || stopChar[begin].CompareTo(str) == 0)    return true;   return false;}