C# 如何循环读取文件每一行文本内容

            try
            {
                using (StreamReader sr = new StreamReader(Server.MapPath("template.html")))
                {
                    string line;
                    while ((line = sr.ReadLine()) != null)
                    {
                        template.Append(line);
                    }
                    sr.Close();
                }
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
                Response.Write("<script>alert('读取文件错误')</script>");
            }