今天做了日志文件读写,使用方法FileStream ,StreamWriter ,File

   //异常处理
        public static bool GeException(string strMessage, string strName)
        {
            string time = System.DateTime.Now.ToString();
            string strPathName = System.DateTime.Now.ToShortDateString() + "_" + strName + "_Error__Log.txt";
            //指定路径
            string strPath = "C:\\EWJAR_LoG";
            if (!Directory.Exists(strPath))
            {
                DirectoryInfo di = Directory.CreateDirectory(strPath);

            }
            strPathName = strPath + "\\" + strPathName;
            WirteFile(strPathName, strMessage);
            ////如果文件a.txt存在就打开，不存在就新建 .append 是追加写
            //FileStream fst = new FileStream(strPathName, FileMode.Append);
            ////写数据到a.txt格式
            //StreamWriter swt = new StreamWriter(fst, System.Text.Encoding.GetEncoding("utf-8"));
            ////写入
            //swt.WriteLine(time + '\r' + "错误信息开始:" + strMessage);
            //swt.Close();
            //fst.Close();
            return true;
        }

 

        /// <summary>
        /// 判断文件否存在,不存在,创建,存在追加重写
        /// </summary>
        /// <param name="strPath">文绝对路径</param>
        /// <param name="strMessage">消息</param>
        public static void WirteFile(string strPath, string strMessage)
        {
            string time = System.DateTime.Now.ToString();
            //判断文件的存在
            if (File.Exists(strPath))
            {
                //存文件
                //如果文件a.txt存在就打开，不存在就新建 .append 是追加写
                FileStream fst = new FileStream(strPath, FileMode.Append);
                //写数据到a.txt格式
                StreamWriter swt = new StreamWriter(fst, System.Text.Encoding.GetEncoding("utf-8"));
                //写入
                swt.WriteLine(time + strMessage);
                swt.Close();
                fst.Close();
            }
            else
            {
                //不存在文件
                FileStream fst = new FileStream(strPath, FileMode.CreateNew);
                //写数据到a.txt格式
                StreamWriter swt = new StreamWriter(fst, System.Text.Encoding.GetEncoding("utf-8"));
                //写入
                swt.WriteLine(time + strMessage);
                swt.Close();
                fst.Close();
            }
        }