Mvc绑定对象列表 [英] Mvc bind list of objects

问题描述

我只想绑定一个对象列表，显示它并将其发回，然后在运行时向Add和Delete添加功能。到目前为止，我的问题是我无法在帖子上检索列表。这是我的代码：



模型

I just want to bind a list of objects, display it, and post it back before adding the functionality to Add and Delete at run-time. My problem so far is that I'm not able to retrieve the list on post. Here's my code:

Models

[Serializable]
public class Animal
{
    public int ID { get; set; }
    public string Name { get; set; }
}

[Serializable]
public class Animals
{
    public string FarmName { get; set; }
    public List Farm { get; set; }
}

控制器：

Controller:

public class HomeController : Controller
{
    public ActionResult Index()
    {
        var animals = new Animals();
        animals.FarmName = "My Small Farm";
        animals.Farm = new List();
        animals.Farm.Add(new Animal() { ID = 1, Name = "Dog" });
        animals.Farm.Add(new Animal() { ID = 2, Name = "Cat" });
        
        return View(animals);
    }

    [HttpPost]
    public ActionResult Index(Animals farm)
    {
        return View(farm);
    }
}

查看：

View:

@using MVCTest.Models
@model MVCTest.Models.Animals

@{
    ViewBag.Title = "Home Page";
}

@using (Html.BeginForm("Index", "Home"))
{   
     @Html.LabelFor(x => x.FarmName)
     @Html.TextBoxFor(x => x.FarmName)
        
    for (var i = 0; i < Model.Farm.Count; i++ )
    {
        @Html.LabelFor(x => x.Farm[i].ID)
        @Html.TextBoxFor(x => x.Farm[i].ID)
        
        @Html.LabelFor(x => x.Farm[i].Name)
        @Html.TextBoxFor(x => x.Farm[i].Name)
    }
    
    <input type="submit" value="Submit" />
}

我的尝试：



我尝试在视图中使用foreach和for循环，但是他们都没有回发初始条目。此外，我尝试在for循环中添加一个隐藏字段并将其命名为index并将值设置为变量i。但是，这对我来说也不起作用。



我也试过更改List< animals>在模型中，动物为IEnumerable< animals>在控制器中，我制作了一个新的POST方法public ActionResult Index（动物动物，IEnumerable< animal> farm）。但是，对于变量farm，我仍然为null。



我也尝试将LabelFor（x => x.Farm [i] .ID）更改为HiddenFor（x => x.Farm [i]。但是，生成HTML如下所示：< input data-val =truedata-val-number =字段ID必须是数字。 data-val-required =ID字段是必需的。 id =Farm_0__IDname =Farm [0] .IDtype =hiddenvalue =1>



我知道我必须遗漏一些东西然而，在尝试了整整两天后，我感到很茫然。我将非常感谢任何帮助和/或对我所犯错误的指示。

What I have tried:

I tried using the foreach and the for loops in the View, however both of them didn't post back the initial entries. Also, I tried adding a hidden field in the for loop and named it index and set the value to the variable "i". However, this didn't work for me either.

I also tried changing List<animals> in the model Animals to IEnumerable<animals> and in the controller, I made a new POST method "public ActionResult Index(Animals animals, IEnumerable<animal> farm)". However, I still got a null for the variable "farm".

I also tried changing the LabelFor(x => x.Farm[i].ID) to HiddenFor(x => x.Farm[i].ID) however, the generate HTML looks like this: <input data-val="true" data-val-number="The field ID must be a number." data-val-required="The ID field is required." id="Farm_0__ID" name="Farm[0].ID" type="hidden" value="1">

I know I must be missing something, however, I'm at a loss after trying for 2 whole days. Any help and/or pointers to what I'm doing wrong would be greatly appreciated.

推荐答案

浏览链接： [< a href =http://stackoverflow.com/questions/19964553/mvc-form-not-able-to-post-list-of-objectstarget =_ blanktitle =New Window> ^ ]



深入了解： ASP.NET Wire Format for模型绑定到数组，列表，集合，词典 - Scott Hanselman [ ^ ]

@using (Html.BeginForm("Index", "Home"))
{
    @Html.LabelFor(farm => farm.FarmName)
    @Html.TextBox("farm.FarmName", Model.FarmName)

    for (var i = 0; i < Model.Farm.Count; i++)
    {
        @Html.LabelFor(x => x.Farm[i].ID)
        @Html.TextBox(string.Format("farm.Farm[{0}].ID", i), Model.Farm[i].ID)

        @Html.LabelFor(x => x.Farm[i].Name)
        @Html.TextBox(string.Format("farm.Farm[{0}].Name", i), Model.Farm[i].Name)
    }
    
    <input type="submit" value="Submit" />
}

您还可以查看自定义绑定



http://www.prideparrot.com/blog/archive/2012/6/customizing_property_binding_through_attributes [ ^ ]



这可能有比上述更好的方法，所以看看你是否得到其他答案。

You can look at custom binding also

http://www.prideparrot.com/blog/archive/2012/6/customizing_property_binding_through_attributes[^]

There might be a better way of doing this than the above, so see if you get other answers.

public JsonResult OppDetails(int Id)
       {
           var data = _crmNewCustomerService.GetOppById(Id).Data;
           var selected = data.ToList();
           List<OpportunityViewModel> opportunityData = new List<OpportunityViewModel>();
           foreach (var item in selected)
           {
               if (item.OpportunityTitle != null)
               {
                   OpportunityViewModel model = new OpportunityViewModel();
                   model.CustomerId = Convert.ToInt32(item.CustomerId);
                   model.OpportunityTitle = item.OpportunityTitle;
                   opportunityData.Add(model);
               }
               else
               {

               }
           }

           return Json(opportunityData , JsonRequestBehavior.AllowGet);


       }

这篇关于Mvc绑定对象列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！