asp.net-mvc – MVC 3.0编辑可变长度列表并使用PRG模式

我正在尝试使用带有动作过滤器的PRG模式,如第13点所述：http://weblogs.asp.net/rashid/archive/2009/04/01/asp-net-mvc-best-practices-part-1.aspx.

我有一个编辑动作：

[HttpGet,ImportModelStateFromTempData]
    public ActionResult Edit(int id)
    {
    }

和后期行动：

[HttpPost,ExportModelStateToTempData]
    public ActionResult Edit(int id,FormCollection formCollection)
    {
        if (!TryUpdateModel<CategoryEntity>(category,formCollection))
        {
            return RedirectToAction("Edit",new { id = id });
        }

        // succes,no problem processing this...
        return RedirectToAction("Edit",new { id = id });
    }

一切正常,包括验证和错误消息.

我唯一的问题是重定向后不保留新添加的项目和删除的项目(客户端删除/添加).我试图找到一种方法来重新定位新项目后更新我的模型.我更改了ImportModelStateFromTempData属性以使用OnActionExecuting覆盖而不是OnActionExecuted覆盖来使操作中的ModelState可用但我没有看到从传入的ModelState更新我的模型的干净方法.

更改了ImportModelStateFromTempData：

public class ImportModelStateFromTempData : ModelStateTempDataTransfer
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        ModelStateDictionary modelState = filterContext.Controller.TempData[Key] as ModelStateDictionary;

        if (modelState != null)
        {
            filterContext.Controller.ViewData.ModelState.Merge(modelState);
        }
        base.OnActionExecuting(filterContext);
    }

    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        //ModelStateDictionary modelState = filterContext.Controller.TempData[Key] as ModelStateDictionary;

        //if (modelState != null)
        //{
        //    //Only Import if we are viewing
        //    if (filterContext.Result is ViewResult)
        //    {
        //        filterContext.Controller.ViewData.ModelState.Merge(modelState);
        //    }
        //    else
        //    {
        //        //Otherwise remove it.
        //        filterContext.Controller.TempData.Remove(Key);
        //    }
        //}
        base.OnActionExecuted(filterContext);
    }
}

对此有任何意见,非常感谢,谢谢.

Harmen

更新：我想我可能会添加更多我的(伪)代码以使其更清晰：

public class CategoryEntity
{
    public int Id;
    public string Name;
    public IEnumerable<CategoryLocEntity> Localized;
}

public class CategoryLocEntity
{
    public int CategoryId;
    public int LanguageId;
    public string LanguageName;
    public string Name;
}

我的编辑视图：

@model CategoryEntity

@{
    ViewBag.Title = Views.Category.Edit;
}

<h2>@Views.Category.Edit</h2>

<script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
<script type="text/javascript"><!--

    $(document).ready(function () {
        $('#addItem').click(function () {
            var languageId = $('#languageId').val();
            var index = $('#editor-rows').children().size() - 1;
            $.ajax({
                url: this.href + '?languageId=' + languageId + '&index=' + index,cache: false,error: function (xhr,status,error) {
                    alert(error);
                },success: function (html) {
                    $('#editor-rows').append(html);
                }
            });
            return false;
        });

        $("a.removeItem").live("click",function () {
            $(this).parents("div.editor-row:first").remove();
            return false;
        });
    });

--></script>

@using (Html.BeginForm()) 
{
    @Html.ValidationSummary(false)
    <fieldset>
        <legend>@Views.Shared.Category</legend>
        @Html.HiddenFor(model => model.Id)
        <div id="editor-rows">
            <div class="editor-row">
                <div class="editor-label">
                    @Html.LabelFor(model => model.Name,Views.Shared.NameEnglish)
                </div>
                <div class="editor-field">
                    @Html.EditorFor(model => model.Name)
                    @Html.ValidationMessageFor(model => model.Name)
                </div>
            </div>

            @for (int i = 0; i < Model.Localized.Count; i++)
            {
                @Html.EditorFor(m => m.Localized[i],"_CategoryLoc",null,null)
            }
        </div>

        <div class="editor-label"></div>
        <div class="editor-field">
            @Html.DropDownList("languageId",(IEnumerable<SelectListItem>)ViewBag.LanguageSelectList)
            @Html.ActionLink(Views.Category.AddNewLanguage,"AddNewLanguage",new { id = "addItem" })
        </div>

        <p class="clear">
            <input type="submit" value="@Views.Shared.Save" />
        </p>
    </fieldset>
}

<div>
    @Html.ActionLink(Views.Shared.BackToList,"Index")
</div>

CategoryLocEntity的编辑器模板：

@model CategoryLocEntity

<div class="editor-row">
    @Html.HiddenFor(model => model.Id)
    @Html.HiddenFor(model => model.LanguageId)
    <div class="editor-label">
        @Html.LabelFor(model => model.LanguageName,Model.LanguageName)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Name)
        <a href="#" class="removeItem">@Views.Shared.Remove</a>
        @Html.ValidationMessageFor(model => model.Name)
    </div>
</div>