asp.net – ASP MVC外键提交问题

>我无法使用传递给费用控制器的id参数
>另一个是创建费用表单,我找不到任何userId字段
我要用来节省开支的形式.所以总是有modelstate.isvalid == false.

请查看以下代码.希望您能够帮助我.

// UserController的

public ActionResult Index()
{
    return View(db.Users.ToList());
}

// Inedx View(用户)

<%= Html.ActionLink("Expenses","Index","Expense",new { id=item.Id},null)%>

// ExpenseController

public ActionResult Index(int id)
{
    ViewData["id"] = id;
    return View(db.Expenses.Where(x => x.Users.Id == id).ToList());
}

//索引视图(费用)

<%= Html.ActionLink("Create New","Create",new { id=ViewData["id"]})%>

//费用控制器(创建)

public ActionResult Create(int id)
    {
        //ViewData["id"] = id;
        return View();
    }

//创建视图

<% using (Html.BeginForm()) {%>

    <fieldset>
        <legend>Fields</legend>

        <p>
            <label for="ExpenseTitle">ExpenseTitle:</label>
            <%= Html.TextBox("ExpenseTitle") %>
            <%= Html.ValidationMessage("ExpenseTitle","*") %>
        </p>
        <p>
            <label for="ExpenseDescription">ExpenseDescription:</label>
            <%= Html.TextBox("ExpenseDescription") %>
            <%= Html.ValidationMessage("ExpenseDescription","*") %>
        </p>
        <p>
            <label for="Date">Date:</label>
            <%= Html.TextBox("Date") %>
            <%= Html.ValidationMessage("Date","*") %>
        </p>
        <p>
            <label for="Expense">Expense:</label>
            <%= Html.TextBox("Expense") %>
            <%= Html.ValidationMessage("Expense","*") %>
        </p>
        <p>
            <input type="submit" value="Create" />
        </p>
    </fieldset>

<% } %>

//创建帖子

[AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Create(FormCollection collection)
    {
        var expense = new Expenses();
        try
        {
            TryUpdateModel(expense,new string[] {"UserId","ExpenseTitle","ExpenseDescription","Date","Expense" },collection.ToValueProvider());

                if (ModelState.IsValid)
                {
                    db.AddToExpenses(expense);
                    db.SaveChanges();
                    return RedirectToAction("Index",int.Parse(collection["UserId"]));
                }
                else {
                    return View(expense);
                }


            }
            catch
            {
                return View(expense);
            }
        }