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您好我有以下視圖，從包含類ApplicationSettingEntity的實例的viewdata的表單字段的值。 ApplicationSettingEntity類包含一個機器實體類的實例作爲屬性之一。形式由值填充從 item.Id item.Key item.Machine.Name窗體不會返回所有更新值，而編輯
當我編輯的形式返回item.Id更新的值的價值和item.Key但不item.Machine。名稱
我檢查了item.Machine.Name的值，因爲我正在補充表單，它正確設置文本框的值，但是當我點擊保存按鈕時，爲item.Machine返回的數據爲空。我究竟做錯了什麼？
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %>
<%@ Import Namespace="AppSettings.Web.Models" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Edit Application Setting
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<strong style="color: Black;">
<div>
<% if (ViewData["ApplicationSetting"] != null)
{
var item = (ApplicationSettingEntity)ViewData["ApplicationSetting"];
%>
<%=Html.ActionLink("Back to List", "Index",
new
{
controller = "ApplicationSettings",
Applications = item.Id,
Machines = item.Machine.Id
})%>
</div>
<%=Html.ValidationSummary("Edit was unsuccessful. Please correct the errors and try again.")%>
<%
using (Html.BeginForm((bool)ViewData["IsAdd"] ? "SaveAdd" : "SaveEdit", "ApplicationSettings"))
{%>
<fieldset>
<legend><strong>Application Name:</strong>
</legend>
<p>
<label for="Id" style="font-weight: bold;">
Application Setting Id:</label>
<%=Html.TextBox("Id", item.Id)%>
<%=Html.ValidationMessage("Id", "*")%>
</p>
<p>
<label for="Key" style="font-weight: bold;">
Application Setting Key:</label>
<%=Html.TextBox("Key", item.Key, new {style = "width:400px;"})%>
<%=Html.ValidationMessage("Key", "*")%>
</p>
<p>
<span style="font-weight: bold;">Machine Name: </span>
<%=Html.TextBox("MachineName", item.Machine.Name)%>
</p>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
<%
}%>
<div>
<%=Html.ActionLink("Back to List", "Index",
new
{
controller = "ApplicationSettings",
applicationId = item.Application.Id,
machineId = item.Machine.Id
})%>
</div>
<%
}%>
</asp:Content>