读取文本方式的简单登录

       //定义哈希表
        private Hashtable ht = new Hashtable();
        private void Form1_Load(object sender, EventArgs e)
        {
            StreamReader sr = null;
            try
            {
                //参数一：路径，参数二：编码格式
                sr = new StreamReader(@"C:\Users\Administrator\Desktop\users.txt",
                    Encoding.GetEncoding("gb2312"));
                string str = string.Empty;
                //循环读取文本，每次读取一行
                while ((str = sr.ReadLine()) != null)
                    //将账号密码以键值对的方式添加进入哈希表
                    ht.Add(str.Split(' ')[0], str.Split(' ')[1]);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                sr.Close();
                sr.Dispose();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int count = 0;
            //循环遍历哈希表
            foreach(DictionaryEntry de in ht)
            {
                //如果某一键值对跟账号密码相匹配则累加1
                if (de.Key.Equals(this.textBox1.Text) && de.Value.Equals(this.textBox2.Text))
                    count ++;
            }
            if (count > 0)
                MessageBox.Show("登录成功!");
            else
                MessageBox.Show("登录失败");
        }