我已经经历了一系列的解决方案，这是我发现对我很有效。
在我的例子中，我需要发送一个带有一些凭证的post请求，在脚本中添加jquery是一个很小的开销，但这是值得的。

var printPDF = function () {
        //prevent double sending
        var sendz = {};
        sendz.action = "Print";
        sendz.url = "api/Print";
        jQuery('<form action="' + sendz.url + '" method="POST">' +
            '<input type="hidden" name="action" value="Print" />'+
            '<input type="hidden" name="userID" value="'+$scope.user.userID+'" />'+
            '<input type="hidden" name="ApiKey" value="' + $scope.user.ApiKey+'" />'+
            '</form>').appendTo('body').submit().remove();

    }

在您的组件中，即Angular js代码：

function getthefile (){
window.location.href='http://localhost:1036/CourseRegConfirm/getfile';
};

在使用ajax时对下载二进制文件的支持不是很好，它作为工作草案仍在开发中。

简单下载方法：

您可以使用下面的代码让浏览器下载所请求的文件，所有浏览器都支持这一点，并且显然会同样触发WebApi请求。

$scope.downloadFile = function(downloadPath) { 
    window.open(downloadPath, '_blank', '');  
}

Ajax二进制文件下载方法：

使用ajax下载二进制文件可以在一些浏览器中完成，下面是一个实现，将在最新的Chrome浏览器，Internet Explorer，FireFox和Safari浏览器中工作。
它使用arraybuffer响应类型，然后转换为JavaScript blob，然后使用saveBlob方法保存（尽管目前只存在于Internet Explorer中），或者转换为blob数据URL，由浏览器打开，如果浏览器支持mime类型，则触发下载对话框。

Internet Explorer 11支持（已修复）* 注意：Internet Explorer 11不喜欢使用msSaveBlob函数，如果它已被别名-可能是一个安全功能，但更可能是一个缺陷，所以使用var saveBlob = navigator.msSaveBlob || navigator.webkitSaveBlob ... etc.来确定可用的saveBlob支持导致了异常;因此，下面的代码现在要单独测试navigator.msSaveBlob。谢谢？Microsoft *

// Based on an implementation here: web.student.tuwien.ac.at/~e0427417/jsdownload.html
$scope.downloadFile = function(httpPath) {
    // Use an arraybuffer
    $http.get(httpPath, { responseType: 'arraybuffer' })
    .success( function(data, status, headers) {

        var octetStreamMime = 'application/octet-stream';
        var success = false;

        // Get the headers
        headers = headers();

        // Get the filename from the x-filename header or default to "download.bin"
        var filename = headers['x-filename'] || 'download.bin';

        // Determine the content type from the header or default to "application/octet-stream"
        var contentType = headers['content-type'] || octetStreamMime;

        try
        {
            // Try using msSaveBlob if supported
            console.log("Trying saveBlob method ...");
            var blob = new Blob([data], { type: contentType });
            if(navigator.msSaveBlob)
                navigator.msSaveBlob(blob, filename);
            else {
                // Try using other saveBlob implementations, if available
                var saveBlob = navigator.webkitSaveBlob || navigator.mozSaveBlob || navigator.saveBlob;
                if(saveBlob === undefined) throw "Not supported";
                saveBlob(blob, filename);
            }
            console.log("saveBlob succeeded");
            success = true;
        } catch(ex)
        {
            console.log("saveBlob method failed with the following exception:");
            console.log(ex);
        }

        if(!success)
        {
            // Get the blob url creator
            var urlCreator = window.URL || window.webkitURL || window.mozURL || window.msURL;
            if(urlCreator)
            {
                // Try to use a download link
                var link = document.createElement('a');
                if('download' in link)
                {
                    // Try to simulate a click
                    try
                    {
                        // Prepare a blob URL
                        console.log("Trying download link method with simulated click ...");
                        var blob = new Blob([data], { type: contentType });
                        var url = urlCreator.createObjectURL(blob);
                        link.setAttribute('href', url);

                        // Set the download attribute (Supported in Chrome 14+ / Firefox 20+)
                        link.setAttribute("download", filename);

                        // Simulate clicking the download link
                        var event = document.createEvent('MouseEvents');
                        event.initMouseEvent('click', true, true, window, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
                        link.dispatchEvent(event);
                        console.log("Download link method with simulated click succeeded");
                        success = true;

                    } catch(ex) {
                        console.log("Download link method with simulated click failed with the following exception:");
                        console.log(ex);
                    }
                }

                if(!success)
                {
                    // Fallback to window.location method
                    try
                    {
                        // Prepare a blob URL
                        // Use application/octet-stream when using window.location to force download
                        console.log("Trying download link method with window.location ...");
                        var blob = new Blob([data], { type: octetStreamMime });
                        var url = urlCreator.createObjectURL(blob);
                        window.location = url;
                        console.log("Download link method with window.location succeeded");
                        success = true;
                    } catch(ex) {
                        console.log("Download link method with window.location failed with the following exception:");
                        console.log(ex);
                    }
                }

            }
        }

        if(!success)
        {
            // Fallback to window.open method
            console.log("No methods worked for saving the arraybuffer, using last resort window.open");
            window.open(httpPath, '_blank', '');
        }
    })
    .error(function(data, status) {
        console.log("Request failed with status: " + status);

        // Optionally write the error out to scope
        $scope.errorDetails = "Request failed with status: " + status;
    });
};

用法：

var downloadPath = "/files/instructions.pdf";
$scope.downloadFile(downloadPath);

备注：

您应该修改WebApi方法以返回以下标头：

• 我使用了x-filename头文件来发送文件名，这是一个自定义头文件，但是你可以使用正则表达式从content-disposition头文件中提取文件名。
• 您还应该为响应设置content-type mime头，这样浏览器就知道数据格式。

希望这能帮上忙。

C# WebApi PDF下载所有工作与Angular JS身份验证
Web API控制器

[HttpGet]
    [Authorize]
    [Route("OpenFile/{QRFileId}")]
    public HttpResponseMessage OpenFile(int QRFileId)
    {
        QRFileRepository _repo = new QRFileRepository();
        var QRFile = _repo.GetQRFileById(QRFileId);
        if (QRFile == null)
            return new HttpResponseMessage(HttpStatusCode.BadRequest);
        string path = ConfigurationManager.AppSettings["QRFolder"] + + QRFile.QRId + @"\" + QRFile.FileName;
        if (!File.Exists(path))
            return new HttpResponseMessage(HttpStatusCode.BadRequest);

        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
        //response.Content = new StreamContent(new FileStream(localFilePath, FileMode.Open, FileAccess.Read));
        Byte[] bytes = File.ReadAllBytes(path);
        //String file = Convert.ToBase64String(bytes);
        response.Content = new ByteArrayContent(bytes);
        response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
        response.Content.Headers.ContentDisposition.FileName = QRFile.FileName;

        return response;
    }

Angular JS服务

this.getPDF = function (apiUrl) {
            var headers = {};
            headers.Authorization = 'Bearer ' + sessionStorage.tokenKey;
            var deferred = $q.defer();
            $http.get(
                hostApiUrl + apiUrl,
                {
                    responseType: 'arraybuffer',
                    headers: headers
                })
            .success(function (result, status, headers) {
                deferred.resolve(result);;
            })
             .error(function (data, status) {
                 console.log("Request failed with status: " + status);
             });
            return deferred.promise;
        }

        this.getPDF2 = function (apiUrl) {
            var promise = $http({
                method: 'GET',
                url: hostApiUrl + apiUrl,
                headers: { 'Authorization': 'Bearer ' + sessionStorage.tokenKey },
                responseType: 'arraybuffer'
            });
            promise.success(function (data) {
                return data;
            }).error(function (data, status) {
                console.log("Request failed with status: " + status);
            });
            return promise;
        }

哪一个都行
调用服务的Angular JS控制器

vm.open3 = function () {
        var downloadedData = crudService.getPDF('ClientQRDetails/openfile/29');
        downloadedData.then(function (result) {
            var file = new Blob([result], { type: 'application/pdf;base64' });
            var fileURL = window.URL.createObjectURL(file);
            var seconds = new Date().getTime() / 1000;
            var fileName = "cert" + parseInt(seconds) + ".pdf";
            var a = document.createElement("a");
            document.body.appendChild(a);
            a.style = "display: none";
            a.href = fileURL;
            a.download = fileName;
            a.click();
        });
    };

最后是HTML页面

<a class="btn btn-primary" ng-click="vm.open3()">FILE Http with crud service (3 getPDF)</a>

这将是重构只是分享代码，现在希望它能帮助别人，因为它花了我一段时间来让这个工作。

对我来说，Web API是Rails，客户端Angular与Restangular和FileSaver.js一起使用

• • Web API**

module Api
  module V1
    class DownloadsController < BaseController

      def show
        @download = Download.find(params[:id])
        send_data @download.blob_data
      end
    end
  end
end

• • 超文本标记语言**

<a ng-click="download('foo')">download presentation</a>

• • Angular 控制器**

$scope.download = function(type) {
    return Download.get(type);
  };

• • Angular 服务**

'use strict';

app.service('Download', function Download(Restangular) {

  this.get = function(id) {
    return Restangular.one('api/v1/downloads', id).withHttpConfig({responseType: 'arraybuffer'}).get().then(function(data){
      console.log(data)
      var blob = new Blob([data], {
        type: "application/pdf"
      });
      //saveAs provided by FileSaver.js
      saveAs(blob, id + '.pdf');
    })
  }
});

我们还必须开发一个解决方案，它甚至可以与需要身份验证的API一起工作（参见this article）
下面简单介绍一下我们是如何使用AngularJS的：
步骤1：创建专用指令

// jQuery needed, uses Bootstrap classes, adjust the path of templateUrl
app.directive('pdfDownload', function() {
return {
    restrict: 'E',
    templateUrl: '/path/to/pdfDownload.tpl.html',
    scope: true,
    link: function(scope, element, attr) {
        var anchor = element.children()[0];

        // When the download starts, disable the link
        scope.$on('download-start', function() {
            $(anchor).attr('disabled', 'disabled');
        });

        // When the download finishes, attach the data to the link. Enable the link and change its appearance.
        scope.$on('downloaded', function(event, data) {
            $(anchor).attr({
                href: 'data:application/pdf;base64,' + data,
                download: attr.filename
            })
                .removeAttr('disabled')
                .text('Save')
                .removeClass('btn-primary')
                .addClass('btn-success');

            // Also overwrite the download pdf function to do nothing.
            scope.downloadPdf = function() {
            };
        });
    },
    controller: ['$scope', '$attrs', '$http', function($scope, $attrs, $http) {
        $scope.downloadPdf = function() {
            $scope.$emit('download-start');
            $http.get($attrs.url).then(function(response) {
                $scope.$emit('downloaded', response.data);
            });
        };
    }] 
});

步骤2：创建模板

<a href="" class="btn btn-primary" ng-click="downloadPdf()">Download</a>

第三步：使用它

<pdf-download url="/some/path/to/a.pdf" filename="my-awesome-pdf"></pdf-download>

这将呈现一个蓝色按钮。单击后，将下载PDF（注意：后端必须以Base64编码传送PDF！）并放入href。按钮变为绿色并将文本切换到 * 保存 *。用户可以再次单击，并将显示文件 my-awesome.pdf 的标准下载文件对话框。

将文件作为base64字符串发送。

var element = angular.element('<a/>');
                         element.attr({
                             href: 'data:attachment/csv;charset=utf-8,' + encodeURI(atob(response.payload)),
                             target: '_blank',
                             download: fname
                         })[0].click();

如果attr方法在Firefox中不起作用，也可以使用javaScript setAttribute方法

你可以实现一个showfile函数，它接收从WEBApi返回的数据参数，以及你要下载的文件的文件名。我所做的是创建一个单独的浏览器服务来识别用户的浏览器，然后根据浏览器处理文件的呈现。例如，如果目标浏览器是iPad上的chrome，你必须使用javascript FileReader对象。

FileService.showFile = function (data, fileName) {
    var blob = new Blob([data], { type: 'application/pdf' });

    if (BrowserService.isIE()) {
        window.navigator.msSaveOrOpenBlob(blob, fileName);
    }
    else if (BrowserService.isChromeIos()) {
        loadFileBlobFileReader(window, blob, fileName);
    }
    else if (BrowserService.isIOS() || BrowserService.isAndroid()) {
        var url = URL.createObjectURL(blob);
        window.location.href = url;
        window.document.title = fileName;
    } else {
        var url = URL.createObjectURL(blob);
        loadReportBrowser(url, window,fileName);
    }
}

function loadFileBrowser(url, window, fileName) {
    var iframe = window.document.createElement('iframe');
    iframe.src = url
    iframe.width = '100%';
    iframe.height = '100%';
    iframe.style.border = 'none';
    window.document.title = fileName;
    window.document.body.appendChild(iframe)
    window.document.body.style.margin = 0;
}

function loadFileBlobFileReader(window, blob,fileName) {
    var reader = new FileReader();
    reader.onload = function (e) {
        var bdata = btoa(reader.result);
        var datauri = 'data:application/pdf;base64,' + bdata;
        window.location.href = datauri;
        window.document.title = fileName;
    }
    reader.readAsBinaryString(blob);
}