文件操作

/// <summary>
        /// 将存贮在文本文件中的数据绑定到DropDownList中  test,test
        /// </summary>
        /// <param name="drdlst">下拉菜单</param>
        /// <param name="filePath">虚拟路径</param>
        public void Drdlst_BindDataByTxt1(DropDownList drdlst, string filePath)
        {
            string fileName = HttpContext.Current.Server.MapPath(filePath);
            string content = "";
            StreamReader sr = null;
            try
            {
                //打开文件并显示其内容
                sr = new StreamReader(fileName, System.Text.Encoding.Default);
                for (string line = sr.ReadLine(); line != null; line = sr.ReadLine())
                {
                    content += line.ToString();
                }
                string[] arr = content.Split(',');
                for (int i = 0; i < arr.Length; i++)
                {
                    ListItem li = new ListItem();
                    li.Text = arr[i].ToString();
                    li.Value = arr[i].ToString();
                    drdlst.Items.Add(li);
                }
            }
            catch (IOException ee)
            {
                HttpContext.Current.Response.Write("<script>alert(" + ee.Message + ")</script>");
            }
            finally
            {
                if (sr != null)
                {
                    sr.Close();
                }
            }
        }

        /// <summary>
        /// 获取txt中信息
        /// </summary>
        /// <param name="filePath">虚拟路径</param>
        /// <returns></returns>
        public string GetTxtInfo(string filePath)
        {
            string fileName = HttpContext.Current.Server.MapPath(filePath);
            string str = "";
            StreamReader sr = null;
            try
            {
                sr = new StreamReader(fileName, System.Text.Encoding.Default);
                for (string line = sr.ReadLine(); line != null; line = sr.ReadLine())
                {
                    str += line.ToString();
                }
            }
            catch (IOException ee)
            {
                HttpContext.Current.Response.Write("<script>alert(" + ee.Message + ")</script>");
            }
            finally
            {
                if (sr != null)
                {
                    sr.Close();
                }
            }

            return str;
        }

        /// <summary>
        /// 保存数据到txt中
        /// </summary>
        /// <param name="str">要保存的数据</param>
        /// <param name="filePath">虚拟路径</param>
        public void SaveTxtInfo(string str, string filePath)
        {
            string fileName = HttpContext.Current.Server.MapPath(filePath);
            StreamWriter sw = null;
            FileStream oFileStream = null;
            try
            {
                if (!System.IO.File.Exists(fileName))
                {
                    oFileStream = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
                }
                else
                {
                    oFileStream = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite);
                }

                sw = new StreamWriter(oFileStream, Encoding.Default);
                sw.Write(str);
                sw.WriteLine();
            }
            catch (IOException ee)
            {
                HttpContext.Current.Response.Write("<script>alert(" + ee.Message + ")</script>");
            }
            finally
            {
                if (sw != null)
                {
                    sw.Close();
                    oFileStream.Close();
                }
            }
        }