如何将 C#.NET MVC 中的用户输入数据保存到列表中？

debugcn 发表于 Dev

蜜饯芒果

我对使用 MVC 模式非常陌生，但我想要做的是让用户输入一些数字，然后每次他们提交一个数字时，它都会被添加到列表中。但是列表在按钮按下之间被擦除，我目前在控制器中拥有所有列表内容。

控制器

public class NumberController : Controller
{
    List<int> numList = new List<int>();

    // GET: Number
    public ActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public ActionResult ProcessNumber(Number number)
    {
        int RNo = number.RNum;
        numList.Add(RNo);
        string sequenceList = "";
        foreach (int num in numList) { sequenceList = sequenceList + ", " + num; }

        ViewBag.Message = "Number " + RNo + " saved successfully!" + " This is your current sequence :" + sequenceList + " A total of " + numList.Count + "numbers.";
        return View("Index");
    }
}

然后在视图中我有这个。

@model TechMVC.Models.Number

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Index</h2>

@using (Html.BeginForm("ProcessNumber", "Number", FormMethod.Post)) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Number</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.RNum, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.RNum, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.RNum, "", new { @class = "text-danger" })

            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
                <p>@ViewBag.Message</p>
            </div>
        </div>
    </div>
}

出来的样子是这样的：

我对让它看起来很花哨不感兴趣，我只是仍然不太确定 MVC 框架。我知道我已经将数据从用户发送到视图，然后发送到控制器，但我是否也曾在某个时候使用过模型？我应该将列表存储在模型中还是视图中？

在

您必须将数据存储在某个地方。例如，您可以将其存储在会话中

列表 numList = null; int rNo = number.RNum; string sequenceList = string.Empty;

        if (Session["NumList"] != null)
        {
            //session exist. set numList = session
            numList = Session["NumList"] as List<int>;
        }
        else {
            //session not exist. set numList as new
            numList = new List<int>();
        }

        //add number to numList
        numList.Add(rNo);

        //set session = numList
        Session["NumList"] = numList;

        //make join oj numList
        sequenceList = String.Join(", ", numList.ToArray());
        //set message in a ViewBag
        ViewBag.Message = $"Number {rNo} saved successfully!" +
            $" This is your current sequence : {sequenceList}" +
            $" A total of {numList.Count} numbers.";

        return View("Index");

我没有 Vs 所以可能会出错

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