C#文件下载（适用于各个浏览器）

1、cs代码

 public void DownFile(string filePath ,string fileName )
 {
  // filePath  文件路径 例如：/File/记录.xlsx 

  // fileName  文件名称 例如：记录.xlsx （要后缀哦）
 Encoding encoding; // 申明编码
 string outputFileName; // 输出名字
 Debug.Assert(HttpContext.ApplicationInstance.Request.UserAgent != null, "HttpContext.ApplicationInstance.Request.UserAgent != null");
 string browser = HttpContext.ApplicationInstance.Request.UserAgent.ToUpper();
 // 微软的浏览器和ie过滤
 if (browser.Contains("MS") && browser.Contains("IE"))
 {
 outputFileName = HttpUtility.UrlEncode(filePath);
 encoding = Encoding.Default;
 }
 //火狐
 else if (browser.Contains("FIREFOX"))
 {
 outputFileName = fileName;
 encoding = Encoding.GetEncoding("GB2312");
 }
 else
 {
 outputFileName = HttpUtility.UrlEncode(fileName);
 encoding = Encoding.Default;
 }

 string absoluFilePath = Server.MapPath(filePath); //获取上传文件路径
 FileStream fs = new FileStream(absoluFilePath, FileMode.Open);
 byte[] bytes = new byte[(int)fs.Length];
 fs.Read(bytes, , bytes.Length);
 fs.Close(); //关闭流，释放资源
 HttpContext.ApplicationInstance.Response.Clear();
 HttpContext.ApplicationInstance.Response.Buffer = true;
 HttpContext.ApplicationInstance.Response.ContentEncoding = encoding;
 HttpContext.ApplicationInstance.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", string.IsNullOrEmpty(outputFileName) ? DateTime.Now.ToString("yyyyMMddHHmmssfff") : outputFileName));
 Response.BinaryWrite(bytes);
 Response.Flush();
 HttpContext.ApplicationInstance.Response.End();
 }

2、html代码

前端HTML 写一个a标签就好：如 <a href='DownFile' target='_blank'>文件下载</a>