Question

我需要为移动电脑制作网络应用程序 - ＆gt; Datalogic Skorio。在用户输入0之前，它会累计数量。它将计数器变量加起来的所有内容都重置为0。

这是代码

控制器：

[HttpGet]
public ActionResult Quant()
{
    return View();
}

[HttpPost]
public ActionResult Quant(Qnt qnt)
{
    int qunt = 0;
    string user = (string)TempData.Peek("user");
    string pass = (string)TempData.Peek("pass");
    motorp.AbreEmpresaTrabalho(Interop.StdBE900.EnumTipoPlataforma.tpProfissional, "DEMO", user, pass); // this part it's for using an external software that contains the products and everything.
    while (qnt.qntd != 0 )
    {
        qunt = qunt+qnt.qntd; 
        return View();     
    }
    return RedirectToAction("Fin");
}

查看：

@using Trabalho1.Models
@model Qnt
@{
    ViewBag.Title = "Quantidade";
}
<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>@ViewBag.Title </title>
</head>

<div class="container-fluid">
    <div>
        @using (@Html.BeginForm())
        {
            <label>
                <p>Quantidade desejada:</p>
                @Html.TextBoxFor(m => m.qntd, new { @class = "form-control" })
            </label>
             <p>@Html.Raw(ViewData["qunt"])</p> \\ ignore this line.testing something
            <button class="btn btn-info">Add</button>
        }
    </div>
    <div class=" row">
        <div class="col-md-2">0)Sair</div>

    </div>
</div>

Answer 1

当用户在View中输入值时，它将转到post方法

[HttpPost]
public ActionResult Quant(Qnt qnt)
{
.....
}

在此方法中，您声明变量int qunt = 0; 同样在while循环中，如果没有，则检查qnt.qntd !=0然后它将进入循环并进行求和，但下一行是return view();，因此它将再次返回到视图。然后用户键入值，然后如上所述开始处理循环。

EG: **`Cycle 1`**
    User entered 2
    Control come to the controller
    qunt is set to zero //qunt = 0
    checking 2 != 0 // true
    Enter the while loop
    qunt = qunt + 2 // qunt = 0 + 2 = 2
    return view()//go to the view again

   **Cycle 2**

    user entered 5
    Control come to the controller
    qunt is set to zero //qunt = 0 --rested 2 to 0 here
    checking 5 != 0 // true
    Enter the while loop
    qunt = qunt + 5 // qunt = 0 + 5 = 5
    return view()//go to the view again

    **Cycle 3**

    user entered 0
    Control come to the controller
    qunt is set to zero //qunt = 0 --rested 5 to 0 here
    checking 0 != 0 // false
    wont enter the loop

希望你理解。因此，qunt中的值将为0，并且不需要while循环，因为在第一次循环时它将返回到视图。

为什么变量重置为0

1 个答案: