Razor View 引用的调试模型

Question

ASP.Net MVC 和 Razor 页面的新手总数。

我有一个 Razor 视图，上面声明了引用的模型：

@model TestApplication.Models.Registration

如何调试模型？我尝试在模型中设置断点，但是在调试时，断点没有被命中。

代码如下：

Register.cshtml

@model TestApplication.Models.Registration
@{
    string labelClass = "ctrl-label col-sm-4", 
        controlSize = "col-sm-8";   
}

<div class="row">
    <div class="col-md-7 col-md-offset-2">
        <h2>@TestApplication.Resources.General.Register</h2>
        @using (Html.BeginForm("Register", "Account", FormMethod.Post, new{role = "form", @class = "form-horizontal" }))
        {
            <div class="form-group">
                <h3 class="@labelClass">
                    <small>@TestApplication.Resources.General.CreateAccount</small></h3>
            </div>

            <hr />

            <div class="form-group @Html.ValidationErrorFor(m => m.EmailAddress, "has-error has-feedback")">
                @Html.LabelFor(p => p.EmailAddress, new { @class = labelClass })
                <div class="@controlSize">
                    @Html.FormTextBoxFor(p => p.EmailAddress, new { @class = "form-control" })
                    @if (!Html.IsValid(m => m.EmailAddress))
                    { 
                        <span class="glyphicon glyphicon-remove form-control-feedback"></span>
                    }
                    <span class="hint">@TestApplication.Resources.Forms.RegisterHintEmailAddress</span>
                    @Html.ValidationMessageFor(m => m.EmailAddress, null, new { @class = "help-block" })
                </div>
            </div>

            <div class="form-group @Html.ValidationErrorFor(m => m.Username, "has-error has-feedback")">
                @Html.LabelFor(p => p.Username, new { @class = labelClass })
                <div class="@controlSize">
                    @Html.FormTextBoxFor(p => p.Username, new { @class = "form-control" })
                    @if (!Html.IsValid(m => m.Username))
                    { 
                        <span class="glyphicon glyphicon-remove form-control-feedback"></span>
                    }
                    @Html.ValidationMessageFor(m => m.Username, null, new { @class = "help-block" })
                </div>
            </div>

            <div class="form-group">
                <label class="@labelClass">@TestApplication.Resources.Forms.RegisterLabelStartService</label>
                <div class="@controlSize">

                @* I AM GETTING AN ERROR ON THIS LINE... *@
                @*@foreach(var m in Model.Services)
                {
                    <div class="radio">
                        <label>
                            @Html.RadioButtonFor(p => p.StartServiceId, m.Id)
                            @m.DisplayName
                        </label>
                    </div>
                }*@
                </div>
            </div>
        }
    </div>
</div>

Registration.cs

using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Security;
using System.Globalization;
using System.ComponentModel.DataAnnotations;
using DataAnnotationsExtensions;
using TestApplication.Resources;

namespace TestApplication.Models
{
    public class Registration
    {
        [Email(ErrorMessageResourceName = "InvalidEmail", ErrorMessageResourceType = typeof(ErrorMessages))]
        [Required(ErrorMessageResourceName = "RequiredEmailAddress", ErrorMessageResourceType = typeof(ErrorMessages))]
        [HtmlAttribute("placeholder", "PlaceholderEmailAddress", ResourceType = typeof(Forms))]
        [Display(Name = "RegisterLabelEmailAddress", ResourceType = typeof(Forms))]
        public string EmailAddress { get; set; }

        [Email(ErrorMessageResourceName = "InvalidUsername", ErrorMessageResourceType = typeof(ErrorMessages))]
        [Required(ErrorMessageResourceName = "RequiredUsername", ErrorMessageResourceType = typeof(ErrorMessages))]
        [HtmlAttribute("placeholder", "PlaceholderUsername", ResourceType = typeof(Forms))]
        [Display(Name = "RegisterLabelUsername", ResourceType = typeof(Forms))]
        [CustomValidation(typeof(Registration), "CheckIfUserExists")]
        public string Username { get; set; }

        [Display(Name = "RegisterLabelStartService", ResourceType = typeof(Forms))]
        public int StartServiceId { get; set; }

        public ReadOnlyCollection<ServicePlugin> Services { get; private set; }

        public Registration()
        {
            this.Services = new ReadOnlyCollection<ServicePlugin>(new List<ServicePlugin> { new ServicePlugin { Id = 1, DisplayName = "Mobile Services" }, new ServicePlugin { Id = 2, DisplayName = "Cable Services" } });
        }
    }
}

ServicePlugin.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace TestApplication.Models
{
    public class ServicePlugin
    {
        public int Id { get; set; }

        public string DisplayName { get; set; }
    }
}

AccountController.cs

[AllowAnonymous]
public ActionResult Register()
{
  return this.View();
}

我注释掉了剃刀视图的一部分（带有错误的视图），因为我无法正确调试与此相关的类。

具体来说，我想在Registration.cs文件中调试这一行：

**public Registration()**

弄清楚它是如何在视图中填充和使用的。

感谢您对此的任何见解。

附：当我删除发生错误的 Register.cshtml 上的注释时，我收到错误消息： 对象引用未设置为对象的实例。

我可以在这一行设置断点：

@foreach(var m in Model.Services)

但是Model为null并抛出错误：

appXXXX.dll 中出现“System.NullReferenceException”类型的异常，但未在用户代码中处理。

我想我需要了解所有这些是如何联系在一起的。

Answer 1

在您的 Account 控制器中，您需要实例化模型，然后使用 View 方法的重载将模型传递给视图：

[AllowAnonymous]
public ActionResult Register()
{
  return View(new Models.Registration());
}