c# - 使用 asp.net mvc 4 + Entity Framework 将图像保存到数据库

Question

我有这个:

型号:

 public string Picture { get; set; }

 [Column(TypeName = "image")]
 public byte[] Image { get; set; }

 [Display(Name = "Display profile Image")]
 public bool DisplayItem { get; set; }

查看:

<div class="editor-label">
    @Html.LabelFor(model => model.DisplayItem)
</div>
<div class="editor-field">
    @Html.EditorFor(model => model.DisplayItem)
    @Html.ValidationMessageFor(model => model.DisplayItem)
</div>
<div class="editor-label">
    @Html.LabelFor(m => m.Image)
</div>

<input type="file" name="file"/>

和 Controller :

public ActionResult Edit(string UserId)
{
        string username = User.Identity.Name;
        // Fetch the userprofile
        UserProfile user = db.userProfiles.FirstOrDefault(u => u.UserName.Equals(username));
        // Construct the viewmodel

        return View(user);
}

[HttpPost]
public ActionResult Edit(UserProfile userprofile, HttpPostedFileBase file)
{
        if (file != null && file.ContentLength > 0)
        {
            // extract only the fielname
            var fileName = Path.GetFileName(file.FileName);
            // store the file inside ~/App_Data/uploads folder
            var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
            file.SaveAs(path);
        }

        if (ModelState.IsValid)
        {
            string username = User.Identity.Name;
            // Get the userprofile
            UserProfile user = db.userProfiles.FirstOrDefault(u => u.UserName.Equals(username));

            // Update fields

            user.FirstName = userprofile.FirstName;
            user.LastName = userprofile.LastName;
            user.Email = userprofile.Email;
            user.Motto = userprofile.Motto;

            user.PlaceOfBirth = userprofile.PlaceOfBirth;
            user.HowManyBikes = userprofile.HowManyBikes;
            user.BesideYourBeth = userprofile.BesideYourBeth;
            user.NicestRide = userprofile.NicestRide;
            user.WorstRide = userprofile.WorstRide;
            user.AmountKmPerYear = userprofile.AmountKmPerYear;
            user.AverageSpeed = userprofile.AverageSpeed;
            user.AbleToChatWhileRiding = userprofile.AbleToChatWhileRiding;
            user.PhoneNumber = userprofile.PhoneNumber;

            db.Entry(user).State = EntityState.Modified;

            db.SaveChanges();

            return RedirectToAction("Edit", "Account");
        }

        return View(userprofile);
}

但我想将图像保存到数据库，而不仅仅是文件夹。但是如何在 Controller Action 中做到这一点呢？图像现在存储在 map 中而不是数据库中

谢谢

这是编辑:

[HttpPost]
        public ActionResult Edit(UserProfile userprofile, HttpPostedFileBase file)
        {

            if (file != null && file.ContentLength > 0)
            {


                // extract only the fielname
                var fileName = Path.GetFileName(file.FileName);
                // store the file inside ~/App_Data/uploads folder
                var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
                file.SaveAs(path);
            }



            if (ModelState.IsValid)
            {
                string username = User.Identity.Name;
                // Get the userprofile
                UserProfile user = db.userProfiles.FirstOrDefault(u => u.UserName.Equals(username));

                // Update fields

                user.FirstName = userprofile.FirstName;
                user.LastName = userprofile.LastName;
                user.Email = userprofile.Email;
                user.Motto = userprofile.Motto;

                user.PlaceOfBirth = userprofile.PlaceOfBirth;
                user.HowManyBikes = userprofile.HowManyBikes;
                user.BesideYourBeth = userprofile.BesideYourBeth;
                user.NicestRide = userprofile.NicestRide;
                user.WorstRide = userprofile.WorstRide;
                user.AmountKmPerYear = userprofile.AmountKmPerYear;
                user.AverageSpeed = userprofile.AverageSpeed;
                user.AbleToChatWhileRiding = userprofile.AbleToChatWhileRiding;
                user.PhoneNumber = userprofile.PhoneNumber;

                db.Entry(user).State = EntityState.Modified;

                db.SaveChanges();

                return RedirectToAction("Edit", "Account");
            }

            return View(userprofile);
        }

好的，我现在有它了:

[HttpPost]
        public ActionResult Edit(UserProfile userprofile, HttpPostedFileBase file)
        {

            if (file != null && file.ContentLength > 0)
            {               
                // extract only the fielname
                var fileName = Path.GetFileName(file.FileName);
                // store the file inside ~/App_Data/uploads folder

                userprofile.Image = new byte[file.ContentLength];
                file.InputStream.Read(userprofile.Image, 0, file.ContentLength);

                var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
                file.SaveAs(path);
            }
        etc...

我在文件夹中看到图像:~/App_Data/uploads 但不在数据库中，列:图像 - NULL

我现在是这样的:

 [HttpPost]
        public ActionResult Edit(UserProfile userprofile, HttpPostedFileBase file)
        {

            if (file != null && file.ContentLength > 0)
            {               
                // extract only the fielname
                var fileName = Path.GetFileName(file.FileName);
                // store the file inside ~/App_Data/uploads folder



                var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
                file.SaveAs(path);
            }



            if (ModelState.IsValid)
            {
                string username = User.Identity.Name;
                // Get the userprofile
                UserProfile user = db.userProfiles.FirstOrDefault(u => u.UserName.Equals(username));

                // Update fields

                user.FirstName = userprofile.FirstName;
                user.LastName = userprofile.LastName;
                user.Email = userprofile.Email;
                user.Motto = userprofile.Motto;

                user.PlaceOfBirth = userprofile.PlaceOfBirth;
                user.HowManyBikes = userprofile.HowManyBikes;
                user.BesideYourBeth = userprofile.BesideYourBeth;
                user.NicestRide = userprofile.NicestRide;
                user.WorstRide = userprofile.WorstRide;
                user.AmountKmPerYear = userprofile.AmountKmPerYear;
                user.AverageSpeed = userprofile.AverageSpeed;
                user.AbleToChatWhileRiding = userprofile.AbleToChatWhileRiding;
                user.PhoneNumber = userprofile.PhoneNumber;

                userprofile.Image = new byte[file.ContentLength];
                file.InputStream.Read(userprofile.Image, 0, file.ContentLength);

                db.Entry(user).State = EntityState.Modified;               

                db.SaveChanges();

                return RedirectToAction("Edit", "Account");
            }

            return View(userprofile);
        }

但仍然在数据库中 Image 为 NULL

Answer 1

我假设您需要保存在用户配置文件表中的图像。

您需要将此字段添加到用户实体:

public byte[] Image { get;set; }

并设置

user.Image = new byte[file.ContentLength];
file.InputStream.Read(user.Image,0, file.ContentLength);

希望这对您有所帮助。

完整示例在这里:

[HttpPost]
        public ActionResult Edit(UserProfile userprofile, HttpPostedFileBase file)
    {

        if (file != null && file.ContentLength > 0)
        {
            // extract only the fieldname
            var fileName = Path.GetFileName(file.FileName);
            // store the file inside ~/App_Data/uploads folder
            var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
            file.SaveAs(path);
        }

        if (ModelState.IsValid)
        {
            string username = User.Identity.Name;
            // Get the userprofile
            UserProfile user = db.userProfiles.FirstOrDefault(u => u.UserName.Equals(username));

            // Update fields
            user.Image = new byte[file.ContentLength];
            file.InputStream.Read(user.Image,0, file.ContentLength);

            user.FirstName = userprofile.FirstName;
            user.LastName = userprofile.LastName;
            user.Email = userprofile.Email;
            user.Motto = userprofile.Motto;

            user.PlaceOfBirth = userprofile.PlaceOfBirth;
            user.HowManyBikes = userprofile.HowManyBikes;
            user.BesideYourBeth = userprofile.BesideYourBeth;
            user.NicestRide = userprofile.NicestRide;
            user.WorstRide = userprofile.WorstRide;
            user.AmountKmPerYear = userprofile.AmountKmPerYear;
            user.AverageSpeed = userprofile.AverageSpeed;
            user.AbleToChatWhileRiding = userprofile.AbleToChatWhileRiding;
            user.PhoneNumber = userprofile.PhoneNumber;

            db.Entry(user).State = EntityState.Modified;

            db.SaveChanges();

            return RedirectToAction("Edit", "Account");
        }

        return View(userprofile);
    }