方法1

1 int[] ia = {1,2,3};
2 int id = Array.IndexOf(ia,1); // 这里的1就是你要查找的值

 方法2

1 string[] strArr = {"a","b","c","d","e"};
2 bool exists = ((IList)strArr).Contains("a");

参考网址

　　[1] https://www.cnblogs.com/superelement/p/7691229.html