今天写了个检测邮件格式的算法~~

public class Check
    {
        public static bool CheckEmail(string EmailString)
        {
            bool Result=false;
            if(EmailString.Length>=3)
            {
                bool atString=false;
                bool dotString=false;
                int atPosition=0,atCount=0;
                int dotPosition=0;
                string Postfix;
                Postfix=EmailString.Substring(EmailString.Length-3,3);
                Result=PostfixCheck(Postfix);
                for(int i=0;i<EmailString.Length;i++)
                {
                    if(EmailString.Substring(i,1)=="@")
                    {
                        atString=true;
                        atCount+=1;
                        atPosition=i;
                    }
                    if(EmailString.Substring(i,1)==".")
                    {
                        dotString=true;
                        dotPosition=i;
                    }
                }
                if(atString&&dotString&&atCount==1&&System.Math.Abs(atPosition-dotPosition)>1&&Result)
                    Result=true;
                else
                    Result=false;
            }
            else
                Result=false;
            return Result;

        }
        private static bool PostfixCheck(string PostfixString)
        {
            bool PostfixResult=false;
            string PostfixTableString="com|net|org|cn |jp |gov|edu|int|mil|biz|cc |tv |ac |au |de |fr |hk |tw |uk |us |"; //要添加的后缀
            for(int i=0;i<PostfixTableString.Length;i+=4)
            {
                if(PostfixString.ToUpper()==PostfixTableString.Substring(i,3).Trim().ToUpper()||PostfixString.Substring(1,2).ToUpper()==PostfixTableString.Substring(i,3).Trim().ToUpper())
                {
                    PostfixResult=true;
                    break;
                }
            }
            return PostfixResult;
        }
    }