以下是我updateproduct.cshtml遇到错误的文件。
@model ShopperDB.Context.Product
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h2 class="admin-title text-center">Edit Product</h2>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
@Html.HiddenFor(model => model.ProductID)
<div class="form-group">
@Html.LabelFor(model => model.ProductName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-6">
@Html.EditorFor(model => model.ProductName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ProductName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.ProductImage, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-6">
<img src="@Url.Content(Model.ProductImage)" alt="IMAGES" height="300" ; width="300" />
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-6">
@Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Price, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-6">
@Html.EditorFor(model => model.Price, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Price, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.CategoryID, "CategoryName", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-6">
@Html.DropDownList("CategoryID", null, htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.CategoryID, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Save" class="btn btn-default" />
</div>
</div>
</div>
}
</div>
</div>
</div>
</div>
}
以下是我从产品控制器更新产品的方法。
//Update the product
[HttpGet]
[Route("product/update/{id}")]
[CustomAuthorize("admin")]
public ActionResult UpdateTheProduct(int? id)
{
if (Session["UserName"].ToString() != null)
{
if (Session["UserName"].ToString() == "admin")
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Product product = db.Products.Find(id);
if (product == null)
{
return HttpNotFound();
}
ViewBag.CategoryID = new SelectList(db.ProductCategories, "CategoryID", "CategoryName");
return View(product);
}
else
{
return RedirectToAction("Index", "Home");
}
}
else
{
return RedirectToAction("Index", "Home");
}
}
[HttpPost]
[ValidateAntiForgeryToken]
[Route("product/update/{id}")]
[CustomAuthorize("admin")]
public ActionResult UpdateTheProduct([Bind(Include = "ProductID,ProductName,ProductImage,Description,Price,CategoryID")] Product product)
{
if (ModelState.IsValid)
{
if (db.Products.Any(ac => ac.ProductName.Equals(product.ProductName)))
{
TempData["fail"] = "Category already Added";
}
else
{
TempData["notice"] = "Successfully Added";
db.Entry(product).State = EntityState.Modified;
db.SaveChanges();
}
return RedirectToAction("ListOfProducts");
}
return View(product);
}
当我更新产品时，它System.ArgumentException: Value cannot be null or empty.Parameter name: contentPath在存储ProductImage点上向我显示此错误。
因此，请帮助我解决此错误。
您认为这部分代码可能会引发contentPath异常：
<img src="@Url.Content(Model.ProductImage)" alt="IMAGES" height="300" ; width="300" />
如果Model.ProductImagevalue为null或null而不是传递给视图时包含相对路径字符串，则它将抛出contentPath异常，因为Url.Contentmethod不能具有null或empty参数。
要解决内容URL问题，请将if条件检查ProductImage属性中的null或空值UpdateTheProduct（使用GET或POST操作方法，或同时使用这两种方法），然后使用相对路径设置其默认值：
if (String.IsNullOrEmpty(Model.ProductImage))
{
Model.ProductImage = "~/path/imagefile";
}
// some code
return View(product);
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