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Iskhulukhia23 Fg's questions

Martin Hope
Iskhulukhia23 Fg
Asked: 2020-08-10 19:22:28 +0800 CST
  • 0

有信息链接

@foreach (var item in Model)
{
<tr>
    <td>
        @Html.DisplayFor(modelItem => item.Name)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.Price)
    </td>
    <td>
        @Html.DisplayFor(modelItem => item.Count)
    </td>
    <td>
    <td><a href="~/Home/Buy/@item.Price">Купить</a></td>

    </td>

有一种方法可以接受它

[HttpGet]
public IActionResult Buy(decimal? Price)
{
    if(Price == null)
    {
        RedirectToAction("Index");
    }
    ViewBag.Price = Price;

    return View();
}

[HttpPost]
public IActionResult Buy(decimal price ,decimal name)
{
    ViewBag.Sum = price + name;

    return View();
}

这是购买视图

@{
    ViewData["Title"] = "Buy";
}
<form method="post">
    <input type="hidden" value="@ViewBag.Price" name="Price" />

    <table>
        <tr>
            <td>Сумма:</td>
            <td><input type="number" name="Name" /> </td>
        </tr>

        <tr><td><input type="submit" value="Отправить" /> </td><td></td></tr>
    </table>

</form>
<p> Rezult:  @ViewBag.Sum </p>

但是由于某种原因，Price 显示为 0 而不是某个价格。我不明白为什么它不显示来自 ViewBag.Price 的信息。

c#
Martin Hope
Iskhulukhia23 Fg
Asked: 2020-07-28 22:01:42 +0800 CST
  • 0
using (ApplicationContext db = new ApplicationContext())
{
    Team team = db.Teams
        .Include(p => p.Players)
        .Include(a => a.Stadium)
        .FirstOrDefault();

    Console.WriteLine($"Team :{team.Name}");
    foreach (var item in team.Players)
    {
        Console.WriteLine($"Player {item.Name} Country {item.Country}");
    }

我想显示的不是第一个命令，而是第三个命令，而是代码

Team team = db.Teams.Where(a => a.Id == 3).ToList();

抛出错误！

错误 CS0029 无法将类型“System.Collections.Generic.List<ConsoleApp50.Team>”隐式转换为“ConsoleApp50.Team”ConsoleApp50 C:\Users\PC\source\repos\ConsoleApp50\ConsoleApp50\Program.cs

c#
Martin Hope
Iskhulukhia23 Fg
Asked: 2020-07-16 16:23:59 +0800 CST
  • 1
        {
            if(id==null)
            return RedirectToAction("Index");

            ViewBag.Rez = id;

            return View();

        }
        [HttpPost]
        public string  Buy(Order order, Phone phone)
        {
            db.Orders.Add(order);
             db.SaveChanges();
            phone.Count--;
            db.Phones.Update(phone);
            db.SaveChanges();

            return "Спасибо, " + order.User + ", за покупку!";
    


        }

有一个 Phone 类，它有一个 Count 属性（商品的余额），但是当它被出售时余额不会改变。或者您需要创建第三个变量来保存数据。

mvc