asp.net 判断数组是否存在某个值的方法

string str1 = "0,1,2,3,4,5,6 "; 
string[] str = str1.Split( ', '); 
bool hasFlag=false; 
foreach (string a in str) 
{ 
if (a == "7 ") 
{ 
hasFlag=true; 
break; 
} 
} 
if(hasFlag) 
{ //执行当前页 } 
else 
{ //跳转 }

string [] flag = adminuser.Flag.Split('/'); 
List<string> list = new List<string>(flag); 
if (list.Contains("9")) 
Response.Write("当前操作用户"+adminuser.UserName.ToString()); 
else 
Response.Write("<script>alert('您无权限进行此项操作');location.href='admin_main.aspx'</script>");