Question

所以我有一个购物车项目，我必须将图像保存到数据库而不是将它们上传到服务器，这是我的模型

namespace ShoppingCart.Models
{
    [Bind(Exclude = "ItemID")]
    public class Item
    {
        [ScaffoldColumn(false)]
        public int ItemID { get; set; }
        [DisplayName("Category")]
        public int CategoryID { get; set; }
        [DisplayName("Brand")]
        public int BrandID { get; set; }
        [Required(ErrorMessage = "A Name is required")]
        [StringLength(160)]
        public string Title { get; set; }
        public string Description { get; set; }
        [Required(ErrorMessage = "Price is required")]
        [Range(0.01, 100.00,
            ErrorMessage = "Price must be between 0.01 and 500.00")]
        public decimal Price { get; set; }
        [DisplayName("Album Art URL")]
        [StringLength(1024)]

        public string ItemArtUrl { get; set; }
        public byte[] Picture { get; set; }

        public virtual Category Category { get; set; }
        public virtual Brand Brand { get; set; }
        public virtual List<OrderDetail> OrderDetails { get; set; }
    }
}

所以我不确定如何去控制器插入图像或视图来显示它们，我已经搜索了有关这方面的信息，但我真的找不到任何东西，我首先使用实体框架代码。

Answer 1

有两种简单的图像处理方法 - 一种是简单地在控制器中返回图像：

    [HttpGet]
    [AllowAnonymous]
    public ActionResult ViewImage(int id)
    {
        var item = _shoppingCartRepository.GetItem(id);
        byte[] buffer = item.Picture;
        return File(buffer, "image/jpg", string.Format("{0}.jpg", id));
    }

视图会引用它：

    <img src="Home/ViewImage/10" />

此外，您可以将其包含在ViewModel中：

    viewModel.ImageToShow = Convert.ToBase64String(item.Picture);

并在视图中：

    @Html.Raw("<img src=\"data:image/jpeg;base64," + viewModel.ImageToShow + "\" />");

对于数据存储，您只需使用字节数组（varbinary(max)）或blob或任何兼容类型。

上传图片

这里，名为HeaderImage的对象是EntityFramework EntityObject。控制器看起来像：

    [HttpPost]
    public ActionResult UploadImages(HttpPostedFileBase[] uploadImages)
    {
        if (uploadImages.Count() <= 1)
        {
            return RedirectToAction("BrowseImages");
        }

        foreach (var image in uploadImages)
        {
            if (image.ContentLength > 0)
            {
                byte[] imageData = null;
                using (var binaryReader = new BinaryReader(image.InputStream))
                {
                    imageData = binaryReader.ReadBytes(image.ContentLength);
                }
                var headerImage = new HeaderImage
                {
                    ImageData = imageData,
                    ImageName = image.FileName,
                    IsActive = true
                };
                imageRepository.AddHeaderImage(headerImage);
            }
        }
        return RedirectToAction("BrowseImages");
    }

视图看起来像：

            @using (Html.BeginForm("UploadImages", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
            {
                <div class="row">
                    <span class="span4">
                        <input type="file" name="uploadImages" multiple="multiple" class="input-files"/>
                    </span>
                    <span class="span2">
                        <input type="submit" name="button" value="Upload" class="btn btn-upload" />
                    </span>
                </div>
            }

如何使用MVC 4将图像保存到数据库

1 个答案: