net读取写入文件

写入分为续写和覆盖 只需改变第一个参数的值就可切换

代码如下:

   /// <summary>
        /// 内容写入到文本文件
        /// </summary>
        /// <param name="count">状态,判断是续写还是覆盖</param>
        /// <param name="fileName">文件名称</param>
        /// <param name="content">内容</param>
        /// <returns>返回错误信息或时1代表写入成功</returns>
        public static  string writeFile(bool bl,string fileName, string content)
        {
            try
            {
                string pathName = System.Web.HttpContext.Current.Server.MapPath(fileName);
                //这个不存在会自动创建
                using (StreamWriter sw = new StreamWriter(pathName, bl, Encoding.Default))
                {
                    sw.Write(content);
                    sw.Flush();
                    sw.Close();
                }
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
            return "1";
        }

        /// <summary>
        /// 读取文本文件内容
        /// </summary>
        /// <param name="fileName">文件名称</param>
        /// <returns>返回内容</returns>
        public static  string readFile(string fileName)
        {
            string result = ""; 
            try
            {
                string pathName = System.Web.HttpContext.Current.Server.MapPath(fileName);
                using (StreamReader sr = new StreamReader(pathName, Encoding.Default))
                {
                    result = sr.ReadToEnd();
                    sr.Close();
                }
            }
            catch (Exception ex)
            {
                return "0";//ex.Message;
            }
            return result;
        }