Question

场景

我需要将媒体文件以VarBinary的形式存储在数据库中，并将图像以nvarchar或VarBinary的形式存储（未确定）。我正在使用MVC5和实体框架。我已经为数据库中的另一个表制作了一个CRUD控制器，该表不包含媒体文件或图像，并且可以正常工作。

我到目前为止所做的事情

我创建了一个类别控制器，它与控制器一样基本，因为该表的所有数据类型都是文本或数字。我已经为MediaFiles控制器和Image控制器复制了此设计逻辑，但是我缺乏使它适应处理转换此文件并将其存储在mediafiles数据库中的知识。

模型

using System.Web;

namespace MediaOrganiser.Models
{
    using System;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    using System.ComponentModel.DataAnnotations.Schema;
    using System.Data.Entity.Spatial;


    public partial class Image
    {
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
        public Image()
        {
            MediaFiles = new HashSet<MediaFile>();
        }

        public long ImageID { get; set; }

        [Required]
        [StringLength(255)]
        public string Name { get; set; }

        [Required]
        public string FilePath { get; set; }

        public HttpPostedFileBase ImageFile { get; set; }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
        public virtual ICollection<MediaFile> MediaFiles { get; set; }
    }
}

控制器

using System;
using System.Collections.Generic;
using System.Data.Entity.Infrastructure;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MediaOrganiser.Models;
using System.ComponentModel.DataAnnotations.Schema;

namespace MediaOrganiser.Controllers
{
    public class ImageController : Controller
    {
        IMediaRepository mediaRepository = null;
        public ImageController(IMediaRepository mediaRepository)
        {
            this.mediaRepository = mediaRepository;
        }
        public ImageController()
        : this(new SQLMediaRepository())
        {

        }
        // GET: Image
        public ActionResult Index()
        {

            return View();
        }

        // GET: Image/Details/5
        public ActionResult Details(int id)
        {
            return View();
        }

        // GET: Image/Create
        public ActionResult Create()
        {
            Image image = new Image();
            return View(image);
        }

        // POST: Image/Create
        [HttpPost]
        public ActionResult Create(Image im)
        {
            string fileName = Path.GetFileNameWithoutExtension(im.ImageFile.FileName);
            string extension = Path.GetExtension(im.ImageFile.FileName);
            fileName = fileName + DateTime.Now.ToString("yymmssfff") + extension;
            im.FilePath = "~/Images/" + fileName;
            fileName = Path.Combine(Server.MapPath("~/Images/") + fileName);
            im.ImageFile.SaveAs(fileName);
            using (MediaEntities db = new MediaEntities())
            {
                db.Images.Add(im);
                db.SaveChanges();
            }
            ModelState.Clear();
            return View();
        }

        // GET: Image/Edit/5
        public ActionResult Edit(int id)
        {
            return View();
        }

        // POST: Image/Edit/5
        [HttpPost]
        public ActionResult Edit(int id, FormCollection collection)
        {
            try
            {
                // TODO: Add update logic here

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }

        // GET: Image/Delete/5
        public ActionResult Delete(int id)
        {
            return View();
        }

        // POST: Image/Delete/5
        [HttpPost]
        public ActionResult Delete(int id, FormCollection collection)
        {
            try
            {
                // TODO: Add delete logic here

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
    }
}

创建视图

@model MediaOrganiser.Models.Image

@{
    ViewBag.Title = "Create";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Create</h2>


@using (Html.BeginForm("Create", "Image", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
                @Html.AntiForgeryToken()

                <div class="form-horizontal">
        <h4>Image</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.FilePath, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">

                <input type="file" name="ImageFile" required />
                @Html.ValidationMessageFor(model => model.FilePath, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
    @Html.ActionLink("Back to List", "Index")
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

我想要的

当我尝试创建图像时，出现以下错误消息：

值不能为null。参数名称：entitySet

我希望能够在C＃中创建CRUD方法以在数据库中存储以下内容：

名称-nvarchar（255）

FilePath-nvarchar（Max）

我已遵循本教程：https://www.youtube.com/watch?v=5L5W-AE-sEs

非常感谢您的帮助。

Answer 1

您应将财产public HttpPostedFileBase ImageFile { get; set; }标记为[NotMapped]

[NotMapped]
public HttpPostedFileBase ImageFile { get; set; }

与所有不应映射且在数据库表中不存在的属性相同。

在实体框架中使用CRUD处理图像和媒体文件的问题

1 个答案: