如何在MVC

Question

我已在项目的“内容/学生/照片”文件夹中成功上传照片，但无法在索引视图中显示这些照片。

这是我的简短代码：

型号：

public string FirstName { get; set; }

[Display(Name = "Upload Image")]

[NotMapped]

public HttpPostedFileBase Photo { get; set; } 

索引视图（用于显示）：

@Html.DisplayNameFor(model => model.FirstName)

@Html.DisplayNameFor(model => model.Photo)

@foreach (var item in Model)

{

 @Html.DisplayFor(modelItem => item.FirstName)

   @Html.DisplayFor(modelItem => item.Photo)

 }

应该在Index视图中进行哪些更改？

Answer 1

试试这个。

<强>型号：

public byte[] ImageData { get; set; }

[HiddenInput(DisplayValue = false)]
public string ImageMimeType { get; set; }

查看：

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

@Html.EditorForModel()
    <div class="editor-label">Image</div>
        <div class="editor-field">
            @if (Model.ImageData == null) {
                @:None
            } else {
                <img width="150" height="150"
            src="@Url.Action("GetImage", "Product", new { Model.ProductID })" />
            }
        <div>Upload new image: <input type="file" name="Image" /></div>
    </div>        
    <input type="submit" value="Save" />
    @Html.ActionLink("Cancel and return to List", "Index")
}

<强>控制器：

[HttpPost]
public ActionResult Edit(Product product, HttpPostedFileBase image) {
if (ModelState.IsValid) {
    if (image != null) {
        product.ImageMimeType = image.ContentType;
        product.ImageData = new byte[image.ContentLength];
        image.InputStream.Read(product.ImageData, 0, image.ContentLength);
    }
    repository.SaveProduct(product);
    TempData["message"] = string.Format("{0} has been saved", product.Name);
    return RedirectToAction("Index");
    } else {
        // there is something wrong with the data values
        return View(product);
    }
}


public void SaveProduct(Product product) {
    if (product.ProductID == 0) {
        context.Products.Add(product);
    } else {
        Product dbEntry = context.Products.Find(product.ProductID);
        if (dbEntry != null) {
        dbEntry.Name = product.Name;
        dbEntry.Description = product.Description;
        dbEntry.Price = product.Price;
        dbEntry.Category = product.Category;
        dbEntry.ImageData = product.ImageData;
        dbEntry.ImageMimeType = product.ImageMimeType;
        }
    }
    context.SaveChanges();
}


public FileContentResult GetImage(int productId) {
    Product prod = repository.Products.FirstOrDefault(p => p.ProductID == productId);
    if (prod != null) {
        return File(prod.ImageData, prod.ImageMimeType);
    } else {
        return null;
    }
}

希望这会有所帮助......