使用 webapi+Aspose.Cells 导出execl 功能

1.下载破解版Aspose.Cells ，正版 需要授权需要收费，使用的话会有水印。 Aspose.Cells相比NPOI 多了模版语法功能，还是很实用的。对于复杂表格来说。

2.在webapi 项目中新建文件夹 复制 Aspose.Cells .dll ，并添加引用。

        /// <summary>
        /// 返回Excel文件流
        /// </summary>
        /// <param name="model">数据</param>
        /// <param name="templateFileName">模板文件，要全路径</param>
        /// <param name="sheetName">工作簿名称</param>
        /// <param name="outDesigner">工作簿名称</param>
        /// <returns></returns>
        public static byte[] OutDataTableToStream(DataTable dt, string templateFileName)
        {
            dt.TableName = "dt";
            string fileName = Path.GetFileName(templateFileName);
            Workbook wb = new Workbook(templateFileName);
            WorkbookDesigner designer = new WorkbookDesigner(wb);
            designer.SetDataSource(dt);
            designer.Process();
            return designer.Workbook.SaveToStream().ToArray();
        }

传入一个datatble ，并输出 byte[] 

        /// <summary>
        /// 导出dt 
        /// </summary>
        /// <param name="dt"></param>
        /// <returns></returns>

        public HttpResponseMessage ExportDtCsv(DataTable dt, string fileTemplateName)
        {
            HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.Forbidden);

            string templateFileName = HttpContext.Current.Server.MapPath("~/bin/template/" + fileTemplateName);

            byte[] bytes = Util.OutDataTableToStream(dt, templateFileName);

            string fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls";

            result = new HttpResponseMessage(HttpStatusCode.OK);
            result.Content = new ByteArrayContent(bytes);
            result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
            result.Content.Headers.ContentDisposition.FileName = fileName;

            return result;

        }

　输出  HttpResponseMessage 前端调用即可。

模版语法
&= 是可以循环的，&=$ 是直接绑定变量的，不用循环的

前端直接调用

uploadFile (url, param) {
let paramStr = Http.spliceParam(param);
let curUrl = Http.baseUrl() + url + paramStr;
window.open(curUrl);
}

 就能下载了