無法使用視圖模型顯示數據庫中的圖像

Question

我想在我的網站上上傳畫廊和主頁的圖像，所以我將圖像上傳到文件系統並將圖像的信息保存在 db 中，我在數據庫中使用一對多關系，並且我使用視圖模型。 數據庫中的所有數據更新都沒有問題，我檢查了它，但我無法在 View 中顯示圖像，也許我必須在我的方法 Edit 中編寫其他內容？ 請解釋一下。 所以這是我的代碼：查看模型

public class FurnitureVM
{
    public FurnitureVM()
    {
        this.MainImage = new ImageVM();
        this.SecondaryImages = new List<ImageVM>();
    }

    public int? ID { get; set; }
    [Display(Name = "Name")]
    [Required(ErrorMessage = "Enter name")]
    public string Name { get; set; }

    [DataType(DataType.MultilineText)]
    [Display(Name = "...")]
    [Required(ErrorMessage = "...")]
    public string Description { get; set; }
    [Display(Name = "Price ()")]
    [Required]
    [Range(0.01, double.MaxValue, ErrorMessage = "...")]
    public decimal Price { get; set; }

    [Display(Name = "...")]
    [Required(ErrorMessage = "...")]
    public string Manufacturer { get; set; }
    [Display(Name = "Size")]
    [Required(ErrorMessage = "...")]
    public string Size { get; set; }

    [Display(Name = "....")]
    [Required]
    public int CategoryId { get; set; }
    public virtual Category Category { get; set; }

    public IEnumerable<SelectListItem> CategoryList { get; set; }
    public HttpPostedFileBase MainFile { get; set; }
    public IEnumerable<HttpPostedFileBase> SecondaryFiles { get; set; }
    public ImageVM MainImage { get; set; }
    public List<ImageVM> SecondaryImages { get; set; }
}
public class ImageVM
{
    public int? ID { get; set; }
    public string Path { get; set; }
    public string DisplayName { get; set; }           
}

我在控制器中的方法：

public ActionResult Edit(int? id)
{
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }
    var furniture = db.Furnitures.Find(id);
    if (furniture == null)
    {
        return HttpNotFound();
    }

    FurnitureImages main = furniture.Images.Where(x => x.IsMainImage).FirstOrDefault();

        FurnitureVM model = new FurnitureVM();
        model.Name = furniture.Name;
        model.Description = furniture.Description;
        model.Price = furniture.Price;
        model.Size = furniture.Size;
        model.CategoryId = furniture.CategoryId;
         model.Manufacturer = furniture.Manufacturer;
        model.MainImage.Id = main.Id;
        model.MainImage.DisplayName = main.DisplayName;
        model.MainImage.Path = main.Path;
        model.MainImage.IsMainImage = main.IsMainImage;

    //ViewBag.CategoryId = new SelectList(db.Categories, "CategoryId", "Name", furniture.CategoryId);
    return View(model);
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(FurnitureVM model)
{
    if (model.MainFile != null && model.MainFile.ContentLength > 0)
    {
        string displayName = model.MainFile.FileName;
        string extension = Path.GetExtension(displayName);
        string fileName = string.Format("{0}.{1}", Guid.NewGuid(), extension);
        string path = Path.Combine(Server.MapPath("~/Upload/"), fileName);
        model.MainFile.SaveAs(path);
        model.MainImage = new ImageVM() { Path = path, DisplayName = displayName };
    }

    foreach (HttpPostedFileBase file in model.SecondaryFiles)
    {
        FurnitureImages images = new FurnitureImages
        {
            //This is for secondary images for gallery  
        };
    }

    if (!ModelState.IsValid)
    {
        model.CategoryList = new SelectList(db.Categories, "CategoryId", "Name",model.CategoryId); // repopulate the SelectList
        return View(model);
    }

    Furniture furniture = db.Furnitures.Where(x => x.FurnitureId == model.ID).FirstOrDefault();
        FurnitureImages main = furniture.Images.Where(x => x.IsMainImage).FirstOrDefault();
        furniture.Name = model.Name;
        furniture.Description = model.Description;
        furniture.Manufacturer = model.Manufacturer;
        furniture.Price = model.Price;
        furniture.CategoryId = model.CategoryId;
        furniture.Size = model.Size;
        main.Id = model.ID;
        main.DisplayName = model.MainImage.DisplayName;
        main.Path = model.MainImage.Path;
        main.IsMainImage = model.MainImage.IsMainImage;


    if (model.MainImage != null && !model.MainImage.ID.HasValue)
    {
        FurnitureImages image = new FurnitureImages
        {
            Path = model.MainImage.Path,
            DisplayName = model.MainImage.DisplayName,
            IsMainImage = true
        };
        furniture.Images.Add(image);
    }

    // ViewBag.CategoryId = new SelectList(db.Categories, "CategoryId", "Name", furniture.CategoryId);
    db.Entry(furniture).State = EntityState.Modified;
    db.SaveChanges();
     return RedirectToAction("Index");
}

以及我的部分觀點

@model FurnitureStore.ModelView.FurnitureVM
...
@if (Model.MainImage != null)
{
    @Html.HiddenFor(m => m.MainImage.ID)
    @Html.HiddenFor(m => m.MainImage.Path)
    @Html.HiddenFor(m => m.MainImage.DisplayName)
    <img src="@Model.MainImage.Path" alt="@Model.MainImage.DisplayName" />
}

@Html.TextBoxFor(m => m.SecondaryFiles, new { type = "file", multiple = "multiple" })
@Html.ValidationMessageFor(m => m.SecondaryFiles)

@for (int i = 0; i < Model.SecondaryImages.Count; i++)
{
    @Html.HiddenFor(m => m.SecondaryImages[i].ID)
    @Html.HiddenFor(m => m.SecondaryImages[i].Path)
    @Html.HiddenFor(m => m.SecondaryImages[i].DisplayName)
    <img src="@Model.SecondaryImages[i].Path" alt="@Model.MainImage.DisplayName" />
}

Answer 1

您不應該在數據庫中存儲絕對路徑，而是存儲您需要更新以下代碼行的相對路徑：

string path = "~/Upload/"+ fileName;
model.MainFile.SaveAs(Server.MapPath(path));

現在在您看來，您將能夠以這種方式顯示它：

<img src="@Url.Content(Model.MainImage.Path)" alt="@Model.MainImage.DisplayName" />

如果你不能修改路徑保存邏輯，因為任何原因想保存絕對路徑，那么你可以看看下面的帖子：

https://stackoverflow.com/a/12804451/1875256

Answer 2

控制器端看起來不錯您需要更改查看代碼

然后剩下的事情就會像

<img src="@Url.Content(Model.MainImage.Path)" alt="@Model.MainImage.DisplayName" />

或者

<img src="@Url.Content(Model.SecondaryImages[i].Path)" alt="@Model.MainImage.DisplayName" />