如何通过asp.net MVC 4中的ajax请求下载文件

请尝试一下，以成功实现ajax

success: function () {    window.location = '@Url.Action("DownloadAttachment", "PostDetail")';}

更新的答案：

public ActionResult DownloadAttachment(int studentId){   // Find user by passed id    // Student student = db.Students.FirstOrDefault(s => s.Id == studentId);    var file = db.EmailAttachmentReceived.FirstOrDefault(x => x.LisaId == studentId);    byte[] fileBytes = System.IO.File.ReadAllBytes(file.Filepath);    return File(fileBytes, System.Net.Mime.MediaTypeNames.Application.Octet, file.Filename);}

Ajax请求：

$(function () {        $("#DownloadAttachment").click(function () { $.ajax( {     url: '@Url.Action("DownloadAttachment", "PostDetail")',     contentType: 'application/json; charset=utf-8',     datatype: 'json',     data: {         studentId: 123     },     type: "GET",     success: function () {         window.location = '@Url.Action("DownloadAttachment", "PostDetail", new { studentId = 123 })';     } });        });    });