学步园

//流读取写入文件

读取文件
                //读文件操作
                string strFileContent    = "";                            //模版文件的全文内容
                try
                {
                    string strLine = "";                            //每行的内容
                    //使用垃圾回收对该资源进行自动处置using就不用关闭对象，否则必须关闭strFileFullName文件路径。
                    using (StreamReader fileRead = new StreamReader(strFileFullName,Encoding.Default))
                    {
                        while (fileRead.Peek() >= 0)
                        {
                            strLine        = fileRead.ReadLine();
                            strFileContent    += strLine;
                        }
                    }
                }

写入文件
                //写文件操作
                //为了保证文件的格式，替换部分字符串
                strFileContent    = strFileContent.Replace("\t","\r\n\t");
                string strErrmsg;
                string path;
                if (!File.Exists(strFileFullName)) 
                {
                    //strFileFullName文件物理路径
                    path = strFileFullName.Replace("\\demo.txt","");
                    //DirectoryInfo公用创建、移动、和枚举的实例方法
                    DirectoryInfo di = Directory.CreateDirectory(path);
                    //创建文件以UTF-8的编码形式
                    StreamWriter sr = File.CreateText(strFileFullName);
                    sr.Close();
                }

                try
                {
                    System.IO.StreamWriter fileWrite = new StreamWriter(strFileFullName,false,Encoding.Default);
                    //strFileContent 文件内容
                    fileWrite.Write(strFileContent);
                    fileWrite.Close();
                }

//更新替换字段

update UserInfo set URL_Name = 
(select replace(URL_Name,substring(URL_Name,0,17),'http://hanguoji')) 
where substring(URL_Name,0,17)='http://localhost'