Question

我试图在一个View / Action中处理各种模型创作。

当s / o点击＆＃34;新计算机＆＃34; Type ViewModel接收类型为Computer的新对象。 View切换到不同的类型（在本例中为Computer），并根据传入的模型创建View。这工作正常，但在提交表单（调用CreateComputer Action）时，并不是整个计算机对象都被传输 - 确切地说，与计算机相关的属性（两个枚举）都会丢失。我认为这是因为下拉列表的名称不是以硬件开头，而是被称为＆＃34; FormType＆＃34;和＆＃34; PerformanceType＆＃34;相反，这种情况有适当的解决方案吗？

澄清：

模型＆＃34;计算机＆＃34;继承自＆＃34;硬件＆＃34;。因为我想用一个VM处理所有创建，更新等等/ View ViewModel有一个名为Hardware类型硬件的属性。不幸的是，当使用VM作为Action参数时，属性Hardware始终是Hardware类型（尽管有时它应该是Computer类型）。此外，我的方法（部分）工作 - 模型绑定器似乎足够智能绑定到嵌套类型硬件。

我想要什么？

在Action中我希望Method能够确定传入的参数是Hardware类型还是类型Computer（继承表单硬件）并让Controller为确定的模型执行它的操作。换句话说：我想避免为不同的模型创建不同的动作，例如＆＃34; CreateComputer（计算机计算机）＆＃34;和＆＃34; CreateGeneric（硬件硬件）＆＃34;。

型号：

计算机：

namespace UserChange.com.Models
{
public class Computer : Hardware
    {
        public PerformanceType PerformanceType { get; set; }
        public FormType FormType { get; set; }

        public override HardwareType GetHardwareType()
        {
            return HardwareType.Computer;
        }

        public override string ToString()
        {
            return $"Computer: {base.ToString()}";
        }
    }
}

显示器：

using System.ComponentModel.DataAnnotations;

namespace UserChange.com.Models
{
    public class Monitor : Hardware
    {
        [Required]
        public short Size { get; set; }

        [Required]
        public MonitorColor MonitorColor { get; set; }

        public override HardwareType GetHardwareType()
        {
            return HardwareType.Monitor;
        }

        public override string ToString()
        {
            return "Monitor: " + base.ToString();
        }
    }
}

设备：

 [Table("NEOV_Hardware")]
public class Hardware : BaseModel
{
    [Required]
    [StringLength(50)]
    public string Description { get; set; }

    public bool IsVisible { get; set; }

    public virtual HardwareType GetHardwareType()
    {
        return HardwareType.Generic;
    }

    public override string ToString()
    {
        return Description;
    }
}

控制器：

[HttpPost]
public ActionResult CreateComputer(Computer hardware)
{
    var uow = new UnitOfWork(new ApplicationContext());
    uow.HardwareRepository.Add(hardware);
    uow.Save();
    return RedirectToAction("Index");
}

查看：

@using UserChange.com.Models
@using UserChange.dal.Repository.Interface
@model UserChange.ViewModels.NewHardwareViewModel

@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@{
    switch (Model.Hardware.GetHardwareType()) {
        case HardwareType.Computer:
            <h2>New Computer</h2>
            using (Html.BeginForm("CreateComputer", "Hardware", FormMethod.Post)) {
                <table class="table table-hover table-bordered table-striped table-condensed">
                    <tr>
                        <td>Model name:</td>
                        <td>@Html.TextBoxFor(o => o.Hardware.Description)</td>
                    </tr>
                    <tr>
                        <td>Form factor:</td>
                        <td>@Html.EnumDropDownListFor(o => (o.Hardware as Computer).FormType)</td>
                    </tr>
                    <tr>
                        <td>Performance type:</td>
                        <td>@Html.EnumDropDownListFor(o => (o.Hardware as Computer).PerformanceType)</td>
                    </tr>
                    <tr>
                        <td>Comment:</td>
                        <td>@Html.TextAreaFor(o => o.Hardware.Comment)</td>
                    </tr>
                </table>
                <input type="submit" value="Submit" class="btn btn-primary" />
            }
            break;
        case HardwareType.Monitor:
            <h2>New Monitor</h2>
            using (Html.BeginForm("CreateMonitor", "Hardware", FormMethod.Post)) {
                <table class="table table-hover table-bordered table-striped table-condensed">
                    <tr>
                        <td>Model name:</td>
                        <td>@Html.TextBoxFor(o => o.Hardware.Description)</td>
                    </tr>
                    <tr>
                        <td>Size:</td>
                        <td>@Html.TextBoxFor(o => (o.Hardware as Monitor).Size)</td>
                    </tr>
                    <tr>
                        <td>Color:</td>
                        <td>@Html.EnumDropDownListFor(o => (o.Hardware as Monitor).MonitorColor)</td>
                    </tr>
                    <tr>
                        <td>Comment:</td>
                        <td>@Html.TextAreaFor(o => o.Hardware.Comment)</td>
                    </tr>
                </table>
                <input type="submit" value="Submit" class="btn btn-primary" />
            }
            break;
        case HardwareType.Generic:
            <h2>New Generic device</h2>
            using (Html.BeginForm("CreateGeneric", "Hardware", FormMethod.Post)) {
                <table class="table table-hover table-bordered table-striped table-condensed">
                    <tr>
                        <td>Model name:</td>
                        <td>@Html.TextBoxFor(o => o.Hardware.Description)</td>
                    </tr>
                    <tr>
                        <td>Comment:</td>
                        <td>@Html.TextAreaFor(o => o.Hardware.Comment)</td>
                    </tr>
                </table>
                <input type="submit" value="Submit" class="btn btn-primary" />
            }
            break;
    }
}

**编辑1：** - 缺少虚拟机

public class NewHardwareViewModel : BaseViewModel
    {
        public Hardware Hardware { get; set; }
        public NewHardwareViewModel(Hardware hardware, bool isUserAuthorized) : base(isUserAuthorized)
        {
            Hardware = hardware;
        }

        public NewHardwareViewModel(){ }
    }

ASP.Net MVC Modelbinder绑定到嵌套属性

0 个答案: