Html.Editor not rendering the value

问题:

I'm having problems making the Html.Editor rendering the desire HTML.

Here is the scenario:

// assign the value
    ViewBag.BeginDate = seaBeginEnd.beginDate;

//View
    @Html.Editor("Begin", ViewBag.BeginDate as DateTime?)

//HTML Source
    <div class="editor-field">
    <input class="text-box single-line" id="Begin" name="Begin" type="text" value="" />
    </div>

I was specking to see a value of 1/19/2011 12:00:00 AM which is the value of ViewBag.BeginDate, any insights.

Thanks for your help!

回答1:

I was specking to see a value of 1/19/2011 12:00:00 AM which is the value of ViewBag.BeginDate

You cannot expect such thing by passing Begin as first parameter to the Html.Editor helper. The second parameter doesn't do what you think it does. It simply sends some additional view data to the editor template but the original value you are binding to is called Begin so that's what you should assign a value to. Like this:

public ActionResult Index()
{
    ViewBag.Begin = DateTime.Now;
    return View();
}

and then:

@Html.Editor("Begin")

Obviously every time I see someone using ViewBag/ViewData and not strongly typed helpers I feel in the obligation to recommend view models and strongly typed helpers. Example:

Model:

public class MyViewModel
{
    [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
    public DateTime Date { get; set; }
}

Controller:

public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View(new MyViewModel
        {
            Date = DateTime.Now
        });
    }
}

and the corresponding strongly typed view:

@model AppName.Models.MyViewModel
@Html.EditorFor(x => x.Date)