C# a标签请求下载文件

服务器文件后台处理方式：

a标签：

<a href="/FileUpload/DownloadFile?file=/UploadFiles/File/bfcd676b-13a8-4195-b85b-59d9b9ca35e3.doc" title="下载"><span class="fa fa-arrow-circle-down"></span></a>

后台：

        /// <summary>
        /// 根据路径下载文件，主要用于生成的文件的下载
        /// </summary>
        /// <param name="file">文件路径</param>
        /// <returns></returns>
        public ActionResult DownloadFile(string file)
        {
            string realPath = Server.MapPath(file);
            if (!FileUtil.IsExistFile(realPath))
            {
                return null;
            }
            string saveFileName = FileUtil.GetFileName(realPath);
            
            Response.WriteFile(realPath);
            Response.Charset = "GB2312";
            Response.ContentEncoding = Encoding.GetEncoding("GB2312");
            Response.ContentType = "application/ms-excel/msword";
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(saveFileName));
            Response.Flush();
            Response.End();

            return new FileStreamResult(Response.OutputStream, "application/ms-excel/msword");
        }

二进制转文件处理方式（需要文件名和二进制数据）：

a标签：

<a href="/DWGVersion/GetFilesByID?id=162" title="下载"><span class="glyphicon glyphicon-download"></span></a>

后台：

public ActionResult GetFilesByID(string id)
        {
                var dwgVersion = BLLFactory<DWGVersion>.Instance.GetDataById(id);
                if (dwgVersion==null||dwgVersion.DrawingContent == null || dwgVersion.DrawingContent.Length == 1)
                {
                    return null;
            }
            Response.Clear();
            String strFileName = dwgVersion.FileName;//文件名称
            Response.ContentType = "APPLICATION/OCTET-STREAM";
            Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName));
            Response.Buffer = true;
            Response.BinaryWrite(dwgVersion.DrawingContent);//二进制数据
            Response.Flush();
            Response.End();

            return new FileStreamResult(Response.OutputStream, "application/ms-excel/msword");