增删查改实现多文件上传, 采用ASP.NET MVC 5 and EF 6

 public class Support
    {
        public int SupportId { get; set; }

        [Required(ErrorMessage="please enter your Name")]
        [Display(Name="Name")]
        [MaxLength(100)]
        public string Name
        {
            get;
            set;
        }

        [Required(ErrorMessage="plese enter summary")]
        [Display(Name="Summary")]
        [MaxLength(500)]
        public string Summary { get; set; }
        public virtual ICollection<FileDetail> FileDetail { get; set; }

    }

  public class FileDetail
    {
        public Guid Id { get; set; }
        public string FileName { get; set; }
        public string Extension { get; set; }
        public int SupportId { get; set; }

        public virtual Support Support { get; set; }
   
    }

 public class SupportContext:DbContext
    {
        public SupportContext()
            : base("name=DefaultConnection")
        { 
        
        }
        public DbSet<Support> Supports { get; set; }
        public DbSet<FileDetail> FileDetails { get; set; }

    }

 以上是构建模型和上下文

以下是控制器的相关操作

public class SupportController : Controller
    {
        // GET: Support

        private SupportContext db = new SupportContext();

        protected override void Dispose(bool disposing)
        {
            
            db.Dispose();
            base.Dispose(disposing);
        }
        public ActionResult Index()
        {
            return View(db.Supports.ToList());
        }

        public ActionResult Create()
        {
            return View();

        }

        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(Support support)
        {
            if (ModelState.IsValid)
            {
                List<FileDetail> fileDetails = new List<FileDetail>();
                for (int i = 0; i <Request.Files.Count; i++)
                {

                    var file = Request.Files[i];
                    if (file != null && file.ContentLength > 0)
                    {
                        var fileName = Path.GetFileName(file.FileName);
                        FileDetail filedetail = new FileDetail()
                        {

                            FileName = fileName,
                            Extension = Path.GetFileName(fileName),
                            Id = Guid.NewGuid()
                        };
                        fileDetails.Add(filedetail);
                        
                        var path = Path.Combine(Server.MapPath("~/App_Data/Upload/"), filedetail.Id+filedetail.Extension);
                        if (!Directory.Exists(Server.MapPath("~/App_Data/Upload/")))
                        {
                            // Create the directory it does not exist.
                            Directory.CreateDirectory(Server.MapPath("~/App_Data/Upload/"));
                        }
                        file.SaveAs(path);
                    
                    }
                }
                support.FileDetail = fileDetails;
                db.Supports.Add(support);
                db.SaveChanges();
                return RedirectToAction("Index");
               
            
            }
            return View(support);
        }


        public ActionResult Edit(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Support support = db.Supports.SingleOrDefault(x=>x.SupportId==id);
            if (support == null)
            {
                return HttpNotFound();
            }

            return View(support);
        }


        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit(Support support)
        {
            if (ModelState.IsValid)
            { 
              //new files
                for (int i = 0; i <Request.Files.Count; i++)
                {
                  var file=Request.Files[i];
                  if (file!=null&&file.ContentLength>0)
                    {
                        var fileName = Path.GetFileName(file.FileName);
                        FileDetail fileDetail = new FileDetail()
                        {
                             FileName=fileName,
                             Extension=Path.GetExtension(fileName),
                             Id=Guid.NewGuid(),
                             SupportId=support.SupportId

                        };
                        var path = Path.Combine(Server.MapPath("~/App_Data/Upload/"), fileDetail.Id+fileDetail.Extension);
                        file.SaveAs(path);
                        db.Entry(fileDetail).State =EntityState.Added;
                    }

                }
                db.Entry(support).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            
            }
            return View(support);
        
        }



        //删除文件
        public FileResult Download(string p, string d)
        {

            return File(Path.Combine(Server.MapPath("~/App_Data/Upload/"),p),System.Net.Mime.MediaTypeNames.Application.Octet,d);
        }

        [HttpPost]
        public JsonResult DeleteFile(string id)
        {
            if (string.IsNullOrEmpty(id))
            {
                Response.StatusCode =(int) HttpStatusCode.BadRequest;
                return Json(new { Result = "Error" });
            }
            try
            {
                Guid guid = new Guid(id);
                FileDetail fileDetail = db.FileDetails.Find(guid);
                if (fileDetail == null)
                {
                    Response.StatusCode = (int)HttpStatusCode.NotFound;
                    return Json(new { Result = "Error" });

                }
                //Remove from databse
                db.FileDetails.Remove(fileDetail);
                db.SaveChanges();

                //Delete file from the file system
                var path = Path.Combine(Server.MapPath("~/App_Data/Upload"), fileDetail.Id + fileDetail.Extension);
                if (System.IO.File.Exists(path))
                {
                    System.IO.File.Delete(path);

                }
                return Json(new { Result = "OK" });
            }
            catch (Exception ex)
            {

                return Json(new { Result = "Error", Message = ex.Message });
            }


        }


        [HttpPost]
        public JsonResult Delete(int id)
        {
            try
            {
                Support support = db.Supports.Find(id);
                if (support == null)
                {
                    Response.StatusCode = (int)HttpStatusCode.NotFound;
                    return Json(new { Result = "Error" });

                }
                //delete files from the file system
                foreach (var item in support.FileDetail)
                {
                    string path = Path.Combine(Server.MapPath("~/App_Data/Upload"), item.Id + item.Extension);

                    if (System.IO.File.Exists(path))
                    {
                        System.IO.File.Delete(path);
                    }
                }
                db.Supports.Remove(support);
                db.SaveChanges();
                return Json(new { Result = "OK" });
            }
            catch (Exception ex)
            {

                return Json(new { Result="Error",Message=ex.Message});
            }
        
        
        }
      

    }

index是数据列表  create是添加新的数据记录，edit是编辑更新【此处可以达到效果即上传多个文件】

@{
    ViewBag.Title = "Index";
}
@model IEnumerable<MultipleFileUpload2.Models.Support>
<script src="~/Scripts/jquery-1.10.2.js"></script>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table border="1">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.Name)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Summary)
        </th>
        <th>Total Files</th>
        <th></th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Name)
            </td>
            <td>
                @Html.DisplayFor(modelItem => item.Summary)
            </td>
            <td>
                @if (item.FileDetail.Count() == 0)
                {
                    <span>No File</span>
                }
                else
                {
                    <span>@item.FileDetail.Count() File(s)</span>
                }
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id = item.SupportId }) |
            <a href="javascript:void(0);" data-id="@item.SupportId" class="deleteItem">Delete</a>
        </td>
    </tr>
    }

</table>


<script>
  

    $(document).ready(function ()
    {
        $(".deleteItem").click(function (e) {
            e.preventDefault();
            var $ctrl = $(this);
            if (confirm("Do you really want to delete this item?")) {
                $.ajax({
                    url: "/Support/Delete",
                    type: "post",
                    data: {
                        id: $(this).data('id')
                    }

                }).done(function (data) {
                    if (data.Result = "OK") {
                        $ctrl.closest("tr").remove();
                    } else if (data.Result.Message) {
                        alert(data.Result.Message);

                    }

                }).fail(function () {

                    alert("There is something wrong.please try again.");

                })


            }
        });



    });



</script>

@{
    ViewBag.Title = "Create";
}
@model MultipleFileUpload2.Models.Support
<h2>Create</h2>

<form action="" method="post" enctype="multipart/form-data">
    @Html.AntiForgeryToken()
    
    <table>
        <tr>
            <td>Name</td>
            <td><input type="text" name="name" id="name" /></td>
        </tr>
        <tr>
            <td>Summary</td>
            <td><textarea name="summary"></textarea></td>
        </tr>
        <tr>
            <td>Files</td>
            <td><input type="file" multiple="multiple" name="file" /></td>
        </tr>
        <tr><td colspan="2"><button type="submit">Create</button></td></tr>
    </table>
</form>

@{
    ViewBag.Title = "Edit";
}
@model  MultipleFileUpload2.Models.Support
<h2>Edit</h2>

<script src="~/Scripts/jquery-1.10.2.js"></script>
<form action="/Support/Edit/@Model.SupportId" method="post" enctype="multipart/form-data">
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true)
    <table>
        <tr>
            <td>Name</td>
            <input type="hidden" name="supportid" value="@Model.SupportId" />
            <td><input type="text" name="name" id="name" value="@Model.Name" /></td>
        </tr>
        <tr>
            <td>Summary</td>
            <td><textarea name="summary" >@Model.Summary</textarea></td>
        </tr>
        <tr>
            <td>Files</td>
            <td>
                <input type="file" multiple="multiple" name="file" />
                <ul>
                    @foreach (var item in Model.FileDetail)
                    {
                        <li>
                            <a href="/Support/Download/@(item.Id+item.Extension)">@item.FileName</a>
                            <a href="javascript:void;" data-id="@item.Id" class="deleteItem">删除</a>
                        </li>
                    }
                </ul>

            </td>
        </tr>
        <tr><td colspan="2"><button type="submit">Save</button></td></tr>
    </table>
</form>
<script>
    $(".deleteItem").click(function (e) {

        e.preventDefault();
        var $ctrl = $(this);
        if (confirm("Do you reallu want to delete this file?")) {
            $.ajax({
                url: "/Support/DeleteFile",
                type: "post",
                data: {   id: $(this).data('id')}
            }).done(function (data) {
                if (data.Result = "OK") {
                    $ctrl.closest("li").remove();
                } else if (data.Result.Message) {
                    alert(data.Result.Message);
                }

            }).fail(function () {
                alert("This is something wrong.Please try again");

            })


        }


    });



</script>

原文引用：http://techbrij.com/crud-file-upload-asp-net-mvc-ef-multiple