读写文件.替换字符串

        private void CreateNewFile(string cppName)
        {
            this.textBox2.Clear();
            ////////////////////
            //读模板文件
            string strFileName = this.txtTempFile.Text.Trim();
            if (!File.Exists(strFileName)) //如果不文件存在,则抛出异常
            {
                MessageBox.Show("{0} does not exist!", strFileName);
            }
            Stream s = new FileStream(strFileName, FileMode.Open);
            StreamReader sr = new StreamReader(s, Encoding.Default);
            textBox1.Text = sr.ReadToEnd().ToString();
            sr.Close();
            s.Close();
            ////////////////////
            //组合文件内容
            string strOld = textBox1.Text.Trim();
            string strCPPName = strOld.Replace("@_funName", cppName);//"fmmm_05_del"); //更换名称
            string strTableName = strCPPName.Replace("@_tableName",txtTableName.Text); //"TFMMM05");//更改表名称
            string strFunDesc = strTableName.Replace("@_funDescript",txtFunDescript.Text); //"单位组管理");//功能描述
            string strCreater = strFunDesc.Replace("@_creater", txtCreater.Text);//"***");//创建者
            string strCreateTime = strCreater.Replace("@_createTime", txtCreateTime.Value.ToString("yyyy-MM-dd"));//DateTime.Now.ToString("yyyy-MM-dd"));//创建时间
            string strSQL = string.Empty;
            if (cppName.Contains("ins"))
            {
                strSQL = "insert into dbo.TFMMM07(*) values(*)";
            }
            else if (cppName.Contains("upd"))
            {
                strSQL = "update dbo.TFMMM07 set * where rec_id=@rec_id";
            }
            else if (cppName.Contains("del"))
            {
                strSQL = "delete from dbo.@_tableName where rec_id=@rec_id";
            }
            else
            {
                strSQL = "select * from dbo.@_tableName ";
            }
            string strNewSQL = strSQL.Replace("@_tableName", txtTableName.Text);
            string strResult = strCreateTime.Replace("@_sqlString", strNewSQL);
            this.textBox2.Text = strResult;            
            ////////////////////
            //写文件
            //实例化一个文件流--->与写入文件相关联
            FileStream fs = new FileStream(this.txtDestFilePath.Text+cppName+".cpp", FileMode.Create);
            StreamWriter sw = new StreamWriter(fs);
            sw.Write(this.textBox2.Text);
            sw.Flush();
            sw.Close();
            fs.Close();
        }

1。不停的赋值粘贴,修改对应的部分,直接来个文件读写,把需要修改的部分用关键字替换掉

2。读Stream s = new FileStream(strFileName, FileMode.Open);
            StreamReader sr = new StreamReader(s, Encoding.Default);
            textBox1.Text = sr.ReadToEnd().ToString();
3。替换,replace

4.写:     FileStream fs = new FileStream(this.txtDestFilePath.Text+cppName+".cpp", FileMode.Create);
            StreamWriter sw = new StreamWriter(fs);
            sw.Write(this.textB  ox2.Text);
            sw.Flush();
            sw.Close();
            fs.Close();