此方法返回文件流 如果客户端是浏览器会弹出文件保存对话框让用户下载保存
[HttpGet]
public IActionResult DownloadPostcodeImportTemplateFile()
{
var filePath = Path.Combine("StaticFiles", "ExcelTemplate", "postCodeImportTemplate.xls");
var fileName = Path.GetFileName(filePath);
var fileStream = new FileStream(filePath, FileMode.Open);
return File(fileStream, "application/octet-stream", fileName);
}
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