作为编辑视图的一部分,我有以下内容:-
@using (Html.BeginForm()) {
@Html.ValidationSummary(true)
@Html.HiddenFor(model => model.Rack.RackID)
@Html.HiddenFor(model => model.Resource.RESOURCEID)
@Html.HiddenFor(model => model.Rack.timestamp)
@Html.HiddenFor(model=>model.Rack.Technology)
<span class="f"> @Html.TextBoxFor(model => model.Rack.Technology.Tag, new
{ @readonly = "readonly" })</span>
<span class="f">Rack Name </span>
@Html.EditorFor(model => model.Resource.RESOURCENAME)
@Html.ValidationMessageFor(model => model.Resource.RESOURCENAME)
</div>
<div >
<span class="f">Product Name </span>
@Html.DropDownList("productName", ((IEnumerable<TMS.Models.ComponentDefinition>)ViewBag.Products).Select(option => new SelectListItem {
Text = (option == null ? "None" : option.COMPONENTNAME),
Value = option.COMPONENTNAME.ToString(),
Selected = (Model != null) && (Model.Resource.ComponentDefinition != null ) && (option.COMPONENTNAME == Model.Resource.ComponentDefinition.COMPONENTNAME)
}), "Choose...")
@Html.ValidationMessageFor(model => model.Resource.COMPONENTID)
</div>
<input type="submit" value="Save" class="btn btn-primary"/>
}</div>
我有以下 Post Edit 操作方法:-
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(RackJoin rj,FormCollection formValues)
{
string controllername = RouteData.Values["controller"].ToString();
try
{
if (ModelState.IsValid)
{
var message = "";
var status = "";
long assetid = new long();
XmlDocument doc = new XmlDocument();
using (var client = new WebClient())
{ var query = HttpUtility.ParseQueryString(string.Empty);
foreach (string key in formValues)
{
query[key] = this.Request.Form[key];
}
并且 RackJoin 模型类是:-
public class RackJoin
{
public Rack Rack { get; set; }
public Resource Resource { get; set; }}
但我面临的问题是,当我将对象回发到 Post Edit 操作方法时,我将丢失其所有导航属性,例如 (Rack.Technology, Rack.SiteDefinistion) ,所以我如何维护所有对象导航属性,因此如果 Post 编辑操作方法想要访问这些导航属性或编辑视图在模型状态错误后呈现,它们将不会得到空引用异常。