封装Excls数据导出功能 返回一个下载链接地址

    /// <summary>
         /// 获取本地存储地址
         /// </summary>
         /// <param name="dt"></param>
         /// <param name="prefix">前缀类别</param>
         /// <returns></returns>
         public string GetDwonLoadlPath(DataTable dt, string prefix)
         {
             string filename = System.Configuration.ConfigurationManager.AppSettings[prefix].ToString() + Guid.NewGuid() + ".xlsx";
             string filePath = System.Web.Hosting.HostingEnvironment.ApplicationPhysicalPath + "\\File\\Download\\" + filename;
             string returnpath = System.Web.Hosting.HostingEnvironment.ApplicationVirtualPath + "/File/Download/" + filename;
             ExcelHelper.DataTableToExcel(dt, filePath);
             return System.Configuration.ConfigurationManager.AppSettings["DomainName"] + returnpath;
         }

 public class DrugParamsHelper
    {
        private static volatile DrugParamsHelper drugParamsHelper = null;
        private static object syncRoot = new Object();
        public DrugParamsHelper()
        {

        }
        /// <summary>
        /// 初始化注册
        /// </summary>
        public static DrugParamsHelper Instance
        {
            get
            {
                if (drugParamsHelper == null)
                {
                    lock (syncRoot)
                    {
                        if (drugParamsHelper == null)
                        {
                            if (true)
                            {
                            }
                            drugParamsHelper = new DrugParamsHelper();
                        }
                    }
                }
                return drugParamsHelper;
            }
        }
        /// <summary>
        /// 获取本地存储地址
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="prefix">前缀类别</param>
        /// <returns></returns>
        public string GetDwonLoadlPath(DataTable dt, string prefix)
        {
            string filename = System.Configuration.ConfigurationManager.AppSettings[prefix].ToString() + Guid.NewGuid() + ".xlsx";
            string filePath = System.Web.Hosting.HostingEnvironment.ApplicationPhysicalPath + "\\File\\Download\\" + filename;
            string returnpath = System.Web.Hosting.HostingEnvironment.ApplicationVirtualPath + "/File/Download/" + filename;
            ExcelHelper.DataTableToExcel(dt, filePath);
            return System.Configuration.ConfigurationManager.AppSettings["DomainName"] + returnpath;
        }}

调用示例

  //转换列名称成中文名
            Dictionary<string, string> RenameColumDic = new Dictionary<string, string>();
            queryParams.colCollection.ForEach(f =>
            {
                RenameColumDic.Add(f.FieldName, f.DisplayName);
            });
            //将对象转成datatble
            DataTable dataTable = ListTranDataTableHelper.ToDataTable<ClinicalRegistrationCach>(list, RenameColumDic, queryParams.colCollection.Select(c => c.FieldName).ToArray());
            return new Response<string>(DrugParamsHelper.Instance.GetDwonLoadlPath(dataTable, "CDEExclsName"));