Question

我是MVC的新手，还在学习！我正在尝试在我的网站上创建一个非常基本的应用程序，允许用户根据他们的偏好转换货币价值。我制作了网络APi并成功将服务称为我的表格。但是，在我的控制器中，我设法将货币（名称）获取到索引视图，但是一旦在文本框中输入值以生成局部视图，就无法发回表单！我的代码中我做错了什么？！

货币控制器

namespace MVC_ATM.Controllers
{
    public class CurrencyController : Controller
    {
      [HttpGet]
        // GET: Currency
        public ActionResult Index()
        {
            CurrenciesClient Cur = new CurrenciesClient();
           var listCurrency = Cur.findAll();
           SelectList list = new SelectList(listCurrency,"Id", "CurrencyName");
           ViewBag.listCurrencies = list;
            return View();

        }

        [HttpPost]
        public ActionResult Index(Currencies cur)
        {
            if (!ModelState.IsValid)
            {
                string errors = string.Join("<br />", ModelState.Values
                                        .SelectMany(x => x.Errors)
                                        .Select(x => x.ErrorMessage));
                return new ContentResult { Content = errors };


                var rate = Convert.ToDecimal(cur.ConversionRate);

                if (cur.CurrencyName == cur.CurrencyName)
                {
                    ModelState.AddModelError("CurrencyCountry", "Can't make the conversion for the same value");
                }
                else if (cur.CurrencyName != cur.CurrencyName)
                {
                    foreach (var currency in cur.CurrencyName)
                    {
                        ViewBag.Theresult = rate * cur.Value;
                    }
                    return PartialView("_CurrencyValue");

                }
            }
            return View();
                }
    }
}

货币模型

namespace Project.Model
{
    public class Currencies
    {
        public int Id { get; set; }
        public string CurrencyName { get; set; }
        public string CurrencyCountry {get; set;}
        public decimal Value { get; set; }
        public string ConversionRate { get; set; }

    }
}

索引视图

@model Project.Model.Currencies

    @{
        ViewBag.Title = "Index";
    }


<h2>Currency</h2>

<body>
    <div class="converter">
        Convert: @Html.TextBoxFor(m => m.ConversionRate, new { @size = "5" })
        <div class="form-group">
            @Html.Label("Convert from", new { @class = "col-md-2 control-label" })
            <div class="col-md-10">
                @Html.DropDownList("Currency List", ViewBag.listCurrencies as SelectList, "Please Select a currency")

            </div>
        </div>
        <div class="form-group">
            @Html.Label("Convert to", new { @class = "col-md-2 control-label" })
            <div class="col-md-10">
                @Html.DropDownList("Currency List", ViewBag.listCurrencies as SelectList, "Please Select a currency")
            </div>
        </div>


        <div>
            <button type="submit" class="btn btn-primary">Convert</button>
        </div>
    </div>
</body>

Answer 1

需要注意的事项是视图中的boolean equals(int[] a, int[]b) { if (a.length != b.length) return false; if (a == b) return true; if (hashCode(a) != hashCode(b)) return false; Arrays.sort(a); Arrays.sort(b); for(int i=0; i< a.length; i++) { if (a[i] != b[i]) return false; return true; } private int hashCode(int[] a) { int res = 0; for(int i=0; i<a.length; i++) { res ^= a[i] } return res; }操作和缺少POST标记。您创建了一个接受form模型的POST操作，但表单没有发布。只有Currencies将绑定到模型。要获得“货币来自”和“货币到”以及“转换率”，您将需要不同的方法/小的更改。

ConversionModel.cs一个新的索引页面模型，它将捕获您需要的字段。

ConversionRate

获取：虽然你所做的事情没有任何问题，但我们可以使用模型方法并紧密绑定它。

public class ConversionModel
{
    [Required]//decimal would be better but up to you requirement
    public decimal ConversionRate { get; set; }

    [Required]
    public int FromCurrencyId {get;set;}
    public SelectList FromCurrencies {get;set;}

    [Required]
    public int ToCurrencyId {get;set;}
    public SelectList ToCurrencies {get;set;}
}

发布：此处需要注意的重要事项是public ActionResult Index() { CurrenciesClient Cur = new CurrenciesClient(); var listCurrency = Cur.findAll(); ConversionModel model = new ConversionModel(); model.FromCurrencies = new SelectList(listCurrency,"Id", "CurrencyName"); model.ToCurrencies = new SelectList(listCurrency,"Id", "CurrencyName"); return View(model); }将不会被回发。仅发送SelectList，ConversionRate和FromCurrencyId而不是列表。如果发生错误，您将需要重建列表并将其发送回模型中。

ToCurrencyId

查看：

[HttpPost]
public ActionResult Index(ConversionModel curModel)
{
    if(ModelState.IsValid)
    {
        if(curModel.FromCurrencyId ==curModel.ToCurrencyId)
        {
            //do something if same currecnies and return.
        }
        else
        {
            //Get the currencyList with rates  from db
            //use currency ToCurrencyId and FromCurrencyId to fetch the 2 currencies
            // perform conversion with curModel.ConversionRate with existing logic
        } 
    }
    //Don'f forget to rebuild the Select Lists... 
    return View(curModel);
}

不是CUT_COPY_PASTE。请检查是否有错误。这只是一种方法。

@model Project.Model.ConversionModel @{ ViewBag.Title = "Index"; } @using (Html.BeginForm("Index", "Currency", FormMethod.Post) { @Html.TextBoxFor(m => m.ConversionRate, new { @size = "5" }) @* Please check the syntax *@ @Html.DropDownListFor(m => m.FromCurrencyId , Model.FromCurrencies as SelectList) @Html.DropDownListFor(m => m.ToCurrencyId , Model.ToCurrencies as SelectList) <button type="submit" class="btn btn-primary">Convert</button> } POST可能是接下来要学习的东西......请告诉我们。

Answer 2

你需要将你的物品放在这样的表格中：

Register-EngineEvent -SourceIdentifier PowerShell.Exiting -Action {
    Stop-Process iris -force
}

货币转换api网络服务

2 个答案: