Question

在我的MVC程序中，一旦用户提交了编辑表单，该对象的这些值将保存在模型服务器端，但之前的值将显示在视图中。

我知道它与MVC的验证过程有关，它首先在服务器端值之前检查ModelState。我在论坛上阅读的解决方案是清除ModelState。唯一的问题是，ModelState.Clear对我不起作用。

请帮助。

模型

public class Help
    {
        [HiddenInput(DisplayValue=true)]
        public int HelpID { get; set; }

        [Required(ErrorMessage = "Please enter a proper URL")]
        public string URL { get; set; }

        [Required(ErrorMessage = "Please enter a content description:")]
        [DataType(DataType.MultilineText)]
        public string HelpContent { get; set; }

        /*? 2 properites are nullable*/
        public DateTime? createDateTime { get; set; }
        public DateTime? modifiedDateTime { get; set; }        
    }

控制器

/*Create the admin controller*/
    public class AdminController : Controller
    {
        //declare interface object
        private IHelpRepository repository;

        /*Pass a db interface to controller*/
        public AdminController(IHelpRepository repo)
        {
            repository = repo;
        }

        /*default admin screen. displays help table obs*/
        public ViewResult Index()
        {            
            return View();
        }

        /*Returns add view form*/
        public ActionResult AddForm()
        {            
            return PartialView();            
        }

        /*Will handle the post for the add screen after user has
        submitted add information*/
        [HttpPost]
        [ValidateInput(false)] //this allows admin to place html in field
        public ActionResult AddForm(Help help)
        {           
            if (ModelState.IsValid) //if all fields are validated
            {                
                //set the edit date
                help.createDateTime = DateTime.Now;
                repository.SaveHelp(help);                
                return (null); //return "null" to div so control is given back to main view
            }
            else //there is something wrong. send back to view            
            {
                return PartialView(help);
            }
        }

        /*Returns edit view form, searches for object to edit with id
         if no id provided, 0 by default*/
        public ActionResult EditForm(int helpID = 0)
        {
            Help help = repository.Help.FirstOrDefault(q => q.HelpID == helpID);
            help.HelpContent = System.Web.HttpUtility.HtmlDecode(help.HelpContent);

            return PartialView(help);
        }

        /*Will handle the post for the edit screen after user has
        submitted edit information*/
        [HttpPost]
        [ValidateInput(false)] //this allows admin to place html in field
        public ActionResult EditForm(Help help)
        {



            if (ModelState.IsValid) //if all fields are validated
            {
                //set the edit date
                help.modifiedDateTime = DateTime.Now;
                repository.SaveHelp(help);
                ModelState.Clear();
                return (null); //return "null" to div so control is given back to main view
            }
            else //there is something wrong. send back to view            
            {

                return PartialView(help);
            }
        }

        /*Delete action method, searches with id*/
        [HttpPost]
        public ActionResult Delete(int helpId)
        {
            Help helpDel = repository.Help.FirstOrDefault(p => p.HelpID == helpId);
            if (helpDel != null) //if the object is found, delete
            {
                repository.DeleteHelp(helpDel);
            }

            //in all cases return to index
            return RedirectToAction("Index");
        }

        /*Used by the telerik table to rebind grid*/
        [GridAction]
        public ActionResult AjaxBinding()
        {
            return View(new GridModel(repository.Help));
        }
    }//end admin controller class`

部分视图（获取加载到div中） `

@using (Html.BeginForm(null, null, FormMethod.Post, new { id = "Editx" }))
{
    @Html.ValidationSummary(true)
    <fieldset>
        <legend>Edit Entry</legend>
        @Html.HiddenFor(model => model.HelpID)
        <div class="editor-label">
            @Html.LabelFor(model => model.URL)
        </div>
        <div class="editor-field">
           @Html.EditorFor(model => model.URL)
           @Html.ValidationMessageFor(model => model.URL)
        </div>
        <div class="editor-label">
            @Html.LabelFor(model => model.HelpContent, "Help Content")            
        </div>
         <div class="editor-field">
       @{
    Html.Telerik().EditorFor(content => content.HelpContent)
      .Name("HelpContent")
        .FileBrowser(settings => settings
          .Browse("Browse", "ImageBrowser")
          .Thumbnail("Thumbnail", "ImageBrowser")
          .Upload("Upload", "ImageBrowser")
          .DeleteFile("DeleteFile", "ImageBrowser")
          .DeleteDirectory("DeleteDirectory", "ImageBrowser")
          .CreateDirectory("CreateDirectory", "ImageBrowser")
      )
      .Render();
        }
        @Html.ValidationMessageFor(model => model.HelpContent)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.createDateTime, "Create Date")
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.createDateTime)
            @Html.ValidationMessageFor(model => model.createDateTime)
        </div>

        <div class="editor-label">
            @Html.LabelFor(model => model.modifiedDateTime, "Modified Date")
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.modifiedDateTime)
            @Html.ValidationMessageFor(model => model.modifiedDateTime)
        </div>
        <p>
            <input id="btnEdit" type="submit" value="Save" />
            <button id="btnCancel">Cancel</button>
        </p>
    </fieldset>
    }

Answer 1

在浏览了大约一百个链接之后，我找到了解决问题的方法。 ModelState.Clear实际上清除了控制器中的对象值，但无论出于何种原因仍然在视图中显示旧值。也许是因为我将编辑表单加载/卸载到div标签中？不要问。我不知道。对我有用的解决方案是：

$.ajax({ 
url: "somecontroller/someAction,
cache: false, // this is key to make sure JQUERY does not cache your request
success: function( data ) {
alert( data ); } });

我必须将“缓存”设置为“false”。

感谢@ minus4的解决方案，布鲁赫。

MVC ModelState.Clear未更新ModelState

1 个答案: