如何使用MVC进行服务器端验证5 [英] How to do server-side validation using MVC 5

问题描述

我正在一个简单的拍卖网站上为一个慈善机构工作。我有一个商品模型的销售项目和一个出价视图，用户可以输入出价并提交。这个出价是在Item控制器内收到的：

  [HttpPost] 
 [ValidateAntiForgeryToken] 
 public ActionResult出价（int itemID，int bidAmount）
 {
 if（ModelState.IsValid）
 {
项目项目= db.Items.Find（itemID）; 
 if（bidAmount> = item.NextBid）
 {
 item.Bids ++; 
 item.CurrentBid = bidAmount; 
 item.HighBidder = HttpContext.User.Identity.Name; 
 db.Entry（item）.State = EntityState.Modified; 
 db.SaveChanges（）; 
} 
 else 
 {
 //已经超出
} 
 return View（item）; 
} 
 return RedirectToAction（Auction）; 
} 
  

我想知道如何向用户显示服务器端验证。例如，在上述代码中，可能是提交的投标金额不再足够。在这种情况下，我想向用户显示他们已经超出的消息等。

如何将此信息传回给该视图以显示适当的信息？我希望用户看到与之前相同的项目页面视图，更新编辑框中的值并显示消息 - 类似于eBay。谢谢。

解决方案

你应该看看ModelState属性的AddModelError方法。

  [HttpPost] 
 [ValidateAntiForgeryToken] 
 public ActionResult Bid（int itemID，int bidAmount）
 {
 if ModelState.IsValid）
 {
项目项目= db.Items.Find（itemID）; 
 if（bidAmount> = item.NextBid）
 {
 item.Bids ++; 
 item.CurrentBid = bidAmount; 
 item.HighBidder = HttpContext.User.Identity.Name; 
 db.Entry（item）.State = EntityState.Modified; 
 db.SaveChanges（）; 
} 
 else 
 {
 //已经超出
 ModelState.AddModelError（，Already outbid）; 
} 
 return View（item）; 
} 
 return RedirectToAction（Auction）; 
} 
  

要在视图中显示消息，您需要一个ValidationSummary

@ Html.ValidationSummary（true）

I am working on a simple auction website for a charity. I have an Item model for the sale items, and a Bid view where the user can enter a bid and submit it. This bid is received inside the Item controller:

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Bid(int itemID, int bidAmount)
    {
        if (ModelState.IsValid)
        {
            Item item = db.Items.Find(itemID);
            if (bidAmount >= item.NextBid)
            {
                item.Bids++;
                item.CurrentBid = bidAmount;
                item.HighBidder = HttpContext.User.Identity.Name;
                db.Entry(item).State = EntityState.Modified;
                db.SaveChanges();
            }
            else
            {
                // Already outbid
            }
            return View(item);
        }
        return RedirectToAction("Auction");
    }

I would like to know how to display server-side validation to the user. For example, in the above code, it may be that the submitted bid amount is no longer sufficient. In that case, I would like to display a message to the user that they have been outbid etc.

How can I pass this information back to the view to display an appropriate message? I want the user to see the same item page view as before, updating the value in the edit box and displaying the message - similar to eBay. Thanks.

解决方案

you should have a look at the AddModelError Method of the ModelState Property.

   [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Bid(int itemID, int bidAmount)
    {
        if (ModelState.IsValid)
        {
            Item item = db.Items.Find(itemID);
            if (bidAmount >= item.NextBid)
            {
                item.Bids++;
                item.CurrentBid = bidAmount;
                item.HighBidder = HttpContext.User.Identity.Name;
                db.Entry(item).State = EntityState.Modified;
                db.SaveChanges();
            }
            else
            {
                // Already outbid
                ModelState.AddModelError("", "Already outbid");
            }
            return View(item);
        }
        return RedirectToAction("Auction");
    }

To Display the message in your view, you need a ValidationSummary

@Html.ValidationSummary(true)

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