简单的注册表单不发布选定的值

Question

我正在使用 Devexpress MVC 扩展，并试图通过尽可能简化它来找出不同的问题。根据官方网站应该可以，但是选择的值没有传递给控制器。

这是模型和控制器：

public class Fruit
   {
      public int value { get; set; }
      public string name { get; set; }
   }

public ActionResult Index()
      {
         var model = new object[1];
         var fruits = new List();

         fruits.Add(new Fruit() { value = 1, name = "Apple" });
         fruits.Add(new Fruit() { value = 2, name = "Orange"});
         fruits.Add(new Fruit() { value = 3, name = "Lemon"});
         fruits.Add(new Fruit() { value = 4, name = "Pear" });
         fruits.Add(new Fruit() { value = 5, name = "Cherry" });

         model[0] = fruits;
         return View(model);
      }

和视图：

@using (Html.BeginForm("Create", "Home"))
{
   @Html.DevExpress().FormLayout(settings =>
{
   settings.Name = "Myformlayout";
   settings.Width = 600;
   var gi = settings.Items.AddGroupItem(gs =>
   {
      gs.Caption = "TEST";
   });
   gi.Items.Add(item =>
   {
      item.Name = "fruits";
      item.Caption = "Fruits";
      item.NestedExtensionType = FormLayoutNestedExtensionItemType.ComboBox;
      ComboBoxSettings cbset = (ComboBoxSettings)item.NestedExtensionSettings;
      cbset.Properties.TextField = "name";
      cbset.Properties.ValueField = "value";
      cbset.Properties.ValueType = typeof(int);
      cbset.Properties.DropDownStyle = DropDownStyle.DropDownList;
      cbset.Properties.DataSource = Model[0];
   });

   gi.Items.Add(item =>
   {
      item.NestedExtensionType = FormLayoutNestedExtensionItemType.Button;
      var btnset = (ButtonSettings)item.NestedExtensionSettings;
      btnset.Name = "btnSubm";
      btnset.Text = "Send to ctrl";
      btnset.UseSubmitBehavior = true;
   });
}).GetHtml();

选择工作正常，但是当单击 "Send to ctrl" 按钮时，我得到一个 "The parameter dictionary contains a null entry for parameter 'id'. The controller "Home\Create" 需要一个 int id 参数。如果我更改参数要求controller to int?, 调用完成，所以提交有效。

目标：将所选水果的id（值）发送回控制器。

Answer 1

你需要达到什么目的？要使用组合框编辑模型的字段？如果是这样，我将通过以下方式实现：

型号：

public class MyModel {
    public int FruitId { get; set; }
    public MyModel() {

    }
}

控制器：

public ActionResult Index()
{
    var fruits = new List<Fruit>();

    fruits.Add(new Fruit() { id = 0, name = "Apple" });
    fruits.Add(new Fruit() { id = 1, name = "Orange" });
    fruits.Add(new Fruit() { id = 2, name = "Lemon" });
    fruits.Add(new Fruit() { id = 3, name = "Pear" });
    fruits.Add(new Fruit() { id = 4, name = "Cherry" });

    ViewBag.FruitSource = fruits;
    return View(new MyModel());
}

public ActionResult Create(int fruitId) {
    return View(fruitId);
}

public class Fruit {
    public int id { get; set; }
    public string name { get; set; }
}

查看：

@model DXWebApplication1.Models.MyModel
@{
    ViewBag.Title = "Index";
}

@using (Html.BeginForm("Create", "Home")) {
    @Html.DevExpress().FormLayout(settings => {
    settings.Name = "Myformlayout";
    settings.Width = 600;
    var gi = settings.Items.AddGroupItem(gs => {
        gs.Caption = "TEST";
    });
    gi.Items.Add(x => x.FruitId, item => {
        item.Caption = "Fruits";
        item.NestedExtensionType = FormLayoutNestedExtensionItemType.ComboBox;
        ComboBoxSettings cbset = (ComboBoxSettings)item.NestedExtensionSettings;
        cbset.Properties.TextField = "name";
        cbset.Properties.ValueField = "id";
        cbset.Properties.ValueType = typeof(int);
        cbset.Properties.DropDownStyle = DropDownStyle.DropDownList;
        cbset.Properties.DataSource = ViewBag.FruitSource;
    });

    gi.Items.Add(item => {
        item.NestedExtensionType = FormLayoutNestedExtensionItemType.Button;
        var btnset = (ButtonSettings)item.NestedExtensionSettings;
        btnset.Name = "btnSubm";
        btnset.Text = "Send to ctrl";
        btnset.UseSubmitBehavior = true;
    });
}).GetHtml();
}

因此，我使用 Lambda 将布局项绑定到我的模型属性。该字段名称 (FruitId) 将是创建操作参数的名称。

Answer 2

这给了我答案：https://documentation.devexpress.com/#AspNet/CustomDocument9151

所以控制器看起来像这样：

  public ActionResult Create(MyModel item)
      {
         var x = EditorExtension.GetValue<int>("FruitId");

         return RedirectToAction("Index");
      }

感谢您的帮助。抱歉，我不知道是谁的回答让我找到了所需的解决方案。为你们俩点赞！

简单的注册表单不发布选定的值

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asp.net-mvc

devexpress