NetCore&jquery 下载文件

  let xhr = new XMLHttpRequest();
            xhr.open("post", opt.url, true);
            xhr.responseType = "blob";
            xhr.setRequestHeader("Authorization", "Bearer " + jwtString.JwtToken);
            xhr.setRequestHeader('Content-type', 'application/json');
            xhr.onerror = function () {
                if (!!opt.showMsg)
                    opt.showMsg("Request Error");
            };
            xhr.onprogress = function (event) {
                if (event.lengthComputable) {
                    console.debug(`Received ${event.loaded} of ${event.total} bytes`);
                } else {
                    console.debug(`Received ${event.loaded} bytes`);
                }
            };
            xhr.onreadystatechange = function () {
                if (this.readyState == 4) {
                    if (this.status == 200) {
                        let type = xhr.getResponseHeader("content-type");
                        if (type == "text/plain") {
                            let blobresult = new Blob([xhr.response], { type: "text/plain" });
                            blobresult.text().then(text => {
                                if (!!opt.showMsg)
                                    opt.showMsg(text);
                            });
                            return;
                        }
                        let blob = new Blob([xhr.response], { type: type });
                        // 从Response Headers中获取fileName-->中文会乱码？
                        let fileName = xhr.getResponseHeader('Content-Disposition').split(';')[1].split('=')[1].replace(/\"/g, '');
                        fileName = decodeURIComponent(fileName);
                        //对于标签，只有 Firefox 和 Chrome（内核）支持 download 属性
                        //IE10以上支持blob，但是依然不支持download
                        if ('download' in document.createElement('a')) {
                            //支持a标签download的浏览器
                            //通过创建a标签实现
                            let link = document.createElement("a");
                            //文件名
                            link.download = fileName;
                            link.style.display = "none"
                            link.href = URL.createObjectURL(blob);
                            document.body.appendChild(link);
                            link.click();//执行下载
                            URL.revokeObjectURL(link.href);//释放url
                            document.body.removeChild(link);//释放标签
                            //success
                            if (!!opt.showMsg)
                                opt.showMsg(JSi18n["uSRM-DownComplete"]);
                        } else {
                            //不支持
                            if (window.navigator.msSaveOrOpenBlob)
                                window.navigator.msSaveOrOpenBlob(blob, fileName);
                        }
                    } else {
                        if (!!opt.showMsg)
                            opt.showMsg("Request Error.status=" + this.status);
                    }
                }
            };
            xhr.send(JSON.stringify(opt.data));

后端

/// 

    /// 下载文件的格式化输出
    /// 
    [Serializable]
    public sealed class ResumeFileFilterAttribute : ActionFilterAttribute
    {
        /// 

        /// 构造函数
        /// 
        /// 
        public ResumeFileFilterAttribute(int order)
            : base()
        {
            base.Order = order;
        }

        public override void OnResultExecuted(ResultExecutedContext context)
        {
            if (context.Exception != null)
                context.HttpContext.Response.Headers[HeaderNames.ContentType] = "text/plain";
            base.OnResultExecuted(context);
        }

        /// 

        /// 附加请求头
        /// 
        /// 
        public override void OnResultExecuting(ResultExecutingContext context)
        {

            if (context.Result is FileResult)
            {
                var fileResult = (context.Result as FileResult);
                context.HttpContext.Response.Headers[HeaderNames.AccessControlExposeHeaders] = HeaderNames.ContentDisposition;
                context.HttpContext.Response.Headers[HeaderNames.ContentType] = fileResult.ContentType;
                context.HttpContext.Response.Headers[HeaderNames.ContentEncoding] = Encoding.UTF8.HeaderName;
                context.HttpContext.Response.Headers[HeaderNames.ContentDisposition] = CreateDownfileName(context.HttpContext, fileResult.FileDownloadName);
            }
            else if (context.Result is EmptyResult)
                context.Result = new JsonResult(L.Text["查无数据,无法导出该文件"].Value) { ContentType = "text/plain" };
            base.OnResultExecuting(context);
        }

        private string CreateDownfileName(HttpContext httpContext, string fileName)
        {
            var detectionService = httpContext.RequestServices.GetService();
            ContentDispositionHeaderValue attachmentHeaderValue = new("attachment");
            if (detectionService.Browser.Name == Browser.InternetExplorer && (detectionService.Browser.Version == Version.Parse("7.0") || detectionService.Browser.Version == Version.Parse("8.0")))
                attachmentHeaderValue.SetMimeFileName(HttpUtility.UrlEncode(fileName, Encoding.UTF8));
            else if (detectionService.UserAgent != null && detectionService.UserAgent.ToLower().Contains("android"))
                attachmentHeaderValue.SetMimeFileName(MakeAndroidSafeFileName(fileName));
            else
                attachmentHeaderValue.SetHttpFileName(HttpUtility.UrlEncode(fileName, Encoding.UTF8));
            return attachmentHeaderValue.ToString();
        }

        private static readonly Dictionary AndroidAllowedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ._-+,@£$€!½§~'=()[]{}0123456789".ToDictionary(c => c);
        private static string MakeAndroidSafeFileName(string fileName)
        {
            char[] newFileName = fileName.ToCharArray();
            for (int i = 0; i < newFileName.Length; i++)
            {
                if (!AndroidAllowedChars.ContainsKey(newFileName[i]))
                    newFileName[i] = '_';
            }
            return new string(newFileName);
        }
    }