错误回发的模型列表 ASP.NET MVC

Question

所以我有一个视图模型：

public class ClientViewModel
{
    public int ClientID { get; set; }
    [Required]
    [DisplayName("Client Name")]
    public string Name { get; set; }
    [Required]
    [DisplayName("Client Surname")]
    public string Surname { get; set; }
}

以及我使用此视图模型的视图（用于搜索客户列表的按钮、用于按姓名对客户进行排序的按钮以及用于按姓氏对客户进行排序的按钮）：

@model IList<ClientViewModel>

@using (Html.BeginForm("Index", "Client", FormMethod.Post))
{
@Html.AntiForgeryToken()

<div class="form-horizontal">

<div class="form-group">
    <label class="control-label col-md-2">Enter client info:</label>
    <div class="col-md-10">
        <input type="text" id="clientInfo" name="clientInfo" value="@Session["input"]" />
    </div>
</div>

<div class="form-group">
    <div class="col-md-offset-2 col-md-10">
        <input type="submit" name="command" value="Search Client" class="btn btn-default" />
    </div>
</div>

<div class="form-group">
    <div class="col-md-offset-2 col-md-2">
        <input type="submit" name="command" value="Sort by client name" class="btn btn-default" />
    </div>
    <div class="col-md-2">
        <input type="submit" name="command" value="Sort by client surname" class="btn btn-default" />
    </div>
</div>

</div>

<table class="table">
<tr>
    <th>
        @Html.DisplayNameFor(model => model[0].Name)
    </th>
    <th>
        @Html.DisplayNameFor(model => model[0].Surname)
    </th>
</tr>

@for (var i = 0; i < Model.Count; i++)
{
    @Html.HiddenFor(x => x[i].ClientID)
    <tr>
        <td>
            @Html.HiddenFor(x => x[i].Name)
            @Html.DisplayFor(x => x[i].Name)
        </td>
        <td>
            @Html.HiddenFor(x => x[i].Surname)
            @Html.DisplayFor(x => x[i].Surname)
        </td>
        <td>
            @Html.ActionLink("Delete Client", "DeleteClient", new { id = Model[i].ClientID }, new { @class = "btn btn-danger" })
        </td>
        <td>
            @Html.ActionLink("Edit Client", "EditClient", new { id = Model[i].ClientID }, new { @class = "btn btn-default" })
        </td>
    </tr>
}

</table>
}

假设最初的客户是：

Name       Surname
Adam       Gnb
Brandon    Cook
Kevin      Ginger
Patrick    Star

现在，当我在 clientInfo 输入文本框中输入 "g" 并单击搜索按钮时，它会正确显示使用我输入的关键字的客户端。输出为：

Name      Surname
Adam      Gnb
Kevin     Ginger

现在当我点击 "Sort by client surname"。期望的输出是：

Name      Surname
Kevin     Ginger
Adam      Gnb

但是 post 方法中的 clients 参数由于某种原因持有客户端 "Adam Gnb" 和 "Brandon Cook"。这就是为什么输出是：

Name      Surname
Brandon   Cook
Adam      Gnb

似乎从视图返回 IList 并没有保存当前正在显示的客户端。真的不知道如何解决这个问题。

编辑 1：

过滤方法：

public IEnumerable<ClientDTO> GetByClientInfo(string info)
    {
        if (info.Trim() == "")
            throw new ValidationException("Set the input textbox.", "");
        var mapper = new MapperConfiguration(cfg => cfg.CreateMap<Client, ClientDTO>()).CreateMapper();
        return mapper.Map<IEnumerable<Client>, List<ClientDTO>>(Database.Clients.Find(x => x.Name.ToLower().Contains(info.ToLower()) || x.Surname.ToLower().Contains(info.ToLower())));
    }

排序方法：

public IEnumerable<ClientDTO> SortBySurname(IEnumerable<ClientDTO> clients)
    {
        if (clients == null)
            throw new ValidationException("The client list is empty", "");

        var sortedClients = from client in clients
                            orderby client.Surname
                            select client;

        return sortedClients;
    }

Post方法：

[HttpPost]
    public ActionResult Index(IList<ClientViewModel> clients, string command, string clientInfo)
    {
        if(command.Equals("Sort by client name"))
        {
            var mapper = new MapperConfiguration(cfg => cfg.CreateMap<ClientViewModel, ClientDTO>()).CreateMapper();
            var mapperReverse = new MapperConfiguration(cfg => cfg.CreateMap<ClientDTO, ClientViewModel>()).CreateMapper();

            var sortedClients = clientService.SortByName(mapper.Map<IList<ClientViewModel>, List<ClientDTO>>(clients));
            var afterMap = mapperReverse.Map<IEnumerable<ClientDTO>, IList<ClientViewModel>>(sortedClients);
            return View("Index", afterMap);
        }
        else if(command.Equals("Sort by client surname"))
        {
            var mapper = new MapperConfiguration(cfg => cfg.CreateMap<ClientViewModel, ClientDTO>()).CreateMapper();
            var mapperReverse = new MapperConfiguration(cfg => cfg.CreateMap<ClientDTO, ClientViewModel>()).CreateMapper();

            var sortedClients = clientService.SortBySurname(mapper.Map<IList<ClientViewModel>, List<ClientDTO>>(clients));
            var afterMap = mapperReverse.Map<IEnumerable<ClientDTO>, IList<ClientViewModel>>(sortedClients);
            return View("Index", afterMap);
        }
        else
        {
            Session["input"] = clientInfo;
            IEnumerable<ClientDTO> clientDtos;
            try
            {
                clientDtos = clientService.GetByClientInfo(clientInfo);
                var mapper = new MapperConfiguration(cfg => cfg.CreateMap<ClientDTO, ClientViewModel>()).CreateMapper();
                var resultClients = mapper.Map<IEnumerable<ClientDTO>, IList<ClientViewModel>>(clientDtos);
                return View("Index", resultClients);
            }
            catch (ValidationException ex)
            {
                ViewBag.Error = ex.Message;
                if (clients == null)
                {
                    return View(new List<ClientViewModel>());
                }
                return View("Index", clients);
            }
        }
    }

Answer 1

看看这个link

尝试将隐藏输入更改为不使用 Html 助手。导致其将 post 值绑定回输入控件。而是使用普通的 html 元素，例如以下

@for (var i = 0; i < Model.Count; i++)
{
    <input type="hidden" name="[@(i)].ClientId" value="@(Model[i].ClientId)" />
    <tr>
        <td>
            <input type="hidden" name="[@(i)].Name" value="@(Model[i].Name)" />
            @Html.DisplayFor(x => x[i].Name)
         </td>
         <td>
             <input type="hidden" name="[@(i)].Surname" value="@(Model[i].Surname)" />
             @Html.DisplayFor(x => x[i].Surname)
         </td>
         <td>
             @Html.ActionLink("Delete Client", "DeleteClient", new { id = Model[i].ClientID }, new { @class = "btn btn-danger" })
          </td>
          <td>
              @Html.ActionLink("Edit Client", "EditClient", new { id = Model[i].ClientID }, new { @class = "btn btn-default" })
          </td>
    </tr>
}

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