c# 将Datatable数据导出到Excel表格中的示例代码分享

public FileResult GetExcelFile()

    {

      if (Session["beginDate"] != null)

      {

        string bdate = Session["beginDate"].ToString();

        DateTime ld = Convert.ToDateTime(Session["lastDate"].ToString());

        DateTime ldate = ld.AddDays(1);

        string lldate = ldate.ToString("yyyy-MM-dd");

        int ptkey = Convert.ToInt32(Session["Process_PTR"]);

        string proceSql = "select * from Assay_Process where RKEY="+ptkey;

        DataTable proceDt = SqlHelper.QueryTable(proceSql);

        IDataParameter[] iDataTitle = new SqlParameter[3];

        iDataTitle[0] = new SqlParameter("@BeginDate", bdate);

        iDataTitle[1] = new SqlParameter("@LastDate", lldate);

        iDataTitle[2] = new SqlParameter("@RKEY", ptkey);

        DataSet dtTitle = SqlHelper.RunProceduresByParameter("pro_GetAssalyInfoByExportPrint", iDataTitle);

        DataTable dt = dtTitle.Tables[0];

        string outStr = ExcelExport.outExcel(dt);

        byte[] fileContents = Encoding.UTF8.GetBytes(outStr.ToString());

        return File(fileContents, "application/ms-excel", "" + proceDt.Rows[0]["ProcessName"]

        .ToString().Trim() + "化验单据(" + bdate.Trim() + "-" + lldate.Trim() + ").xls");

      }

      else

      {

        string qua_no = Session["quano"].ToString();

        IDataParameter[] iDataTitle = new SqlParameter[1];

        iDataTitle[0] = new SqlParameter("@Qua_no", qua_no);

        DataSet dtTitle = SqlHelper.RunProceduresByParameter("pro_GetAssalyInfoByQua_No", iDataTitle);

        DataTable dt = dtTitle.Tables[0];

        string outStr = ExcelExport.outExcel(dt);

        byte[] fileContents = Encoding.UTF8.GetBytes(outStr.ToString());

        return File(fileContents, "application/ms-excel", "化验单据(" + qua_no.Trim()+ ").xls");

      }

    }