.net core webapi导出文件，支持windows系统和liunx系统使用k8s挂载方式

[HttpGet("/DownFile")]
        [ProducesResponseType(StatusCodes.Status500InternalServerError)]
        [ProducesResponseType(typeof(FileResult), StatusCodes.Status200OK)]
        public Task<FileResult> DownFile(string Path,string FileName)
        {
            try
            {
                string path = Path.Combine(Path, FileName);
                if (!System.IO.File.Exists(path))
                {
                    Console.WriteLine("没有找到文件");
                }
                FileStream stream = System.IO.File.OpenRead(path);
                //导出的是excel文件所以使用application/x-xls，其他文件格式参考(https://editor.csdn.net/md/?articleId=107837283)
                var data = new FileStreamResult(stream, new Microsoft.Net.Http.Headers.MediaTypeHeaderValue("application/x-xls"));
                data.FileDownloadName =FileName;
                return Task.FromResult<FileResult> (data);
            }
            catch(Exception ex)
            {
                Console.WriteLine(ex.Message);
                return Task.FromResult<FileResult>(null);
            }
        }

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