Array.BinarySearch判断一个字符串是否包含在一个字符数组中

string[] strs = {"yyy","xxx",...};
Array.Sort(strs);
string strv = "xxx"; 
int n = Array.BinarySearch(strs , strv);
if( n >= 0 ) 
exist 
else 
no exist

 

调用BinarySearch方法之前，必须对array排序!