C#下载csv代码总结

一、C#导出csv格式代码如下：

         /// <summary>
         /// 下载
         /// </summary>
         /// <param name="startTime"></param>
         /// <param name="endTime"></param>
         public void Download(DateTime? startTime, DateTime? endTime)
         {
             Response<VSysLog> _rsp = new Response<VSysLog>();
             try
             {
                 using (NetEntities et = new NetEntities())
                 {
                     startTime = startTime == null ? DateTime.Now.AddMonths(-) : startTime.Value;
                     endTime = endTime == null ? DateTime.Now : endTime.Value;
                     int deviceType = (int)EnumDeviceType.网关设备;

                     //搜索条件
                     var whereQuery = PredicateExtensions.True<net_warninglog>();
                     //搜索条件---开始时间和结束时间
                     whereQuery = whereQuery.And(n => n.WarningTime >= startTime && n.WarningTime <= endTime);
                     //搜索条件---设备类型
                     whereQuery = whereQuery.And(n => n.DeviecType == deviceType);
                     //搜索条件---模糊查询
                     if (!string.IsNullOrEmpty(Request["condition"]))
                     {
                         string condition = Request["condition"];
                         whereQuery = whereQuery.And(n => n.WarningSource.Contains(condition));
                     }
                     List<VWarningLog> logList = et.net_warninglog.Where(whereQuery.Compile()).AsEnumerable().Select(n =>
                                           new VWarningLog
                                           {
                                               id = n.ID,
                                               warningName = n.WarningName,
                                               warningReason = n.WarningReason,
                                               deviceType = Enum.GetName(typeof(EnumDeviceType), n.DeviecType),
                                               warningSource = n.WarningSource,
                                               descr = n.Descr,
                                               warningTime = n.WarningTime.ToString("yyyy-MM-dd HH:mm:ss")
                                           }).OrderByDescending(x => x.warningTime).ToList();

                     System.IO.StringWriter sw = new StringWriter();
                     StringBuilder sbTitle = new StringBuilder();
                     System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
                     //定义模版（标题、内容字段、格式化参数）
                     string[,] template = new string[,] {{ "终端编号,", "warningSource", "{0}"}, { "设备类型,", "deviceType", "{0}" }, { "报警原因,", "warningReason", "{0}"},
                                                                         { "报警信息,", "warningName", "{0}" }, { "描述", "descr", "{0}" }, { "报警时间", "warningTime", "{0}" } };
                     string strLine = "";
                     sw = new StringWriter();
                     //获取模板的行数
                     int colCount = template.GetLength();
                     //表头
                     for (int i = ; i < colCount; i++)
                     {
                         //在模板里面已经添加了逗号
                         strLine += template[i, ];
                     }
                     strLine.Remove(strLine.Length - );
                     sw.WriteLine(strLine);
                     strLine = "";

                     //表的内容
                     for (int j = ; j < logList.Count; j++)
                     {
                         strLine = "";
                         for (int k = ; k < colCount; k++)
                         {
                             if (k >  && k < colCount)
                             {
                                 strLine += ",";
                             }
                             string cell = "";
                             string data = string.Format(template[k, ], logList[j].GetType().GetProperty(template[k, ]).GetValue(logList[j], null));
                             if (string.IsNullOrEmpty(data))
                             {
                                 strLine += "";
                             }
                             else
                             {
                                 //前面加的单引号则是防止数字被转换成其它格式
                                 cell = "'" + data.Trim();
                             }
                             //防止里面含有特殊符号
                             if (!string.IsNullOrEmpty(cell))
                             {
                                 cell = cell.Replace("\"", "\"\"");
                                 cell = "\"" + cell + "\"";
                                 strLine += cell;
                             }
                         }
                         sw.WriteLine(strLine);
                     }
                     string attachment = "attachment; filename=" + DateTime.Now.ToString("yyyy年MM月dd日HH点") + "网关报警日志.csv";
                     Response.Clear();
                     Response.ClearHeaders();
                     Response.ClearContent();
                     Response.AddHeader("content-disposition", attachment);
                     Response.ContentType = "text/csv";
                     Response.AddHeader("Pragma", "public");
                     Response.Charset = "UTF-8";
                     Response.ContentEncoding = System.Text.Encoding.UTF8;
                     Response.HeaderEncoding = System.Text.Encoding.UTF8;
                     //防止中文乱码
                     Response.BinaryWrite(new byte[] { 0xEF, 0xBB, 0xBF });
                     response.Write(sw.ToString());
                     Response.End();
                     sw.Close();
                 }
             }
             catch (Exception ex)
             {
                 _rsp.code = (int)EnumCode.程序异常;
                 _rsp.msg = ex.Message;
                 LogHelper.WriteLog(className, "Download", ex);
             }
         }

仅作为保存，方便日后查看代码。