绑定时的格式化日期（ASP.NET MVC）

Question

In my ASP.net MVC app I have a view that looks like this:

...
<label>Due Date</label>
<%=Html.TextBox("due")%>
...

I am using a ModelBinder to bind the post to my model (the due property is of DateTime type). The problem is when I put "01/01/2009" into the textbox, and the post does not validate (due to other data being input incorrectly). The binder repopulates it with the date and time "01/01/2009 00:00:00 ".

Is there any way to tell the binder to format the date correctly (ie ToShortDateString() )?

Answer 1

I just came across this very simple and elegant solution, available in MVC 2:

http://geekswithblogs.net/michelotti/archive/2010/02/05/mvc-2-editor-template-with-datetime.aspx

Basically if you are using MVC 2.0, use the following in your view.

 <%=Html.LabelFor(m => m.due) %>
 <%=Html.EditorFor(m => m.due)%>

then create a partial view in /Views/Shared/EditorTemplates, called DateTime.ascx

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<System.DateTime?>" %>
<%=Html.TextBox("", (Model.HasValue ? Model.Value.ToShortDateString() : string.Empty), new { @class = "datePicker" }) %>

When the EditorFor<> is called it will find a matching Editor Template.

Answer 2

Decorate the property in your model with the DataType attribute, and specify that its a Date , and not a DateTime :

public class Model {
  [DataType(DataType.Date)]
  public DateTime? Due { get; set; }
}

You do have to use EditorFor instead of TextBoxFor in the view as well:

@Html.EditorFor(m => m.Due)

Answer 3

It's a dirty hack, but it seems to work.

<%= Html.TextBoxFor(model => model.SomeDate,
    new Dictionary<string, object> { { "Value", Model.SomeDate.ToShortDateString() } })%>

You get the model binding, and are able to override the HTML "value" property of the text field with a formatted string.

Answer 4

I found this question while searching for the answer myself. The solutions above did not work for me because my DateTime is nullable. Here's how I solved it with support for nullable DateTime objects.

<%= Html.TextBox(String.Format("{0:d}", Model.Property)) %>

Answer 5

你为什么不用

<% =Html.TextBox("due", Model.due.ToShortDateString()) %>

Answer 6

First, add this extension for getting property path:

public static class ExpressionParseHelper
{
    public static string GetPropertyPath<TEntity, TProperty>(Expression<Func<TEntity, TProperty>> property)
    {                       
         Match match = Regex.Match(property.ToString(), @"^[^\.]+\.([^\(\)]+)$");
         return match.Groups[1].Value;
    }
}

Than add this extension for HtmlHelper:

 public static MvcHtmlString DateBoxFor<TEntity>(
                this HtmlHelper helper,
                TEntity model,
                Expression<Func<TEntity, DateTime?>> property,
                object htmlAttributes)
            {
                DateTime? date = property.Compile().Invoke(model);
                var value = date.HasValue ? date.Value.ToShortDateString() : string.Empty;
                var name = ExpressionParseHelper.GetPropertyPath(property);

                return helper.TextBox(name, value, htmlAttributes);
            }

Also you should add this jQuery code:

$(function() {
    $("input.datebox").datepicker();
});

datepicker is a jQuery plugin.

And now you can use it:

<%= Html.DateBoxFor(Model, (x => x.Entity.SomeDate), new { @class = "datebox" }) %>

ASP.NET MVC2 and DateTime Format

Answer 7

In order to get strongly typed access to your model in the code behind of your view you can do this:

public partial class SomethingView : ViewPage<T>
{
}

Where T is the ViewData type that you want to pass in from your Action.

Then in your controller you would have an action :

public ActionResult Something(){
    T myObject = new T();
    T.Property = DateTime.Today();

    Return View("Something", myObject);
}

After that you have nice strongly typed model data in your view so you can do :

<label>My Property</label>
<%=Html.TextBox(ViewData.Model.Property.ToShortDateString())%>

Answer 8

I find the best way to do this is to reset the ModelValue

ModelState.SetModelValue("due", new ValueProviderResult(
       due.ToShortDateString(), 
       due.ToShortDateString(), 
       null));

Answer 9

I guess personally I'd say its best or easiest to do it via a strongly typed page and some defined model class but if you want it to be something that lives in the binder I would do it this way:

public class SomeTypeBinder : IModelBinder
{
    public object GetValue(ControllerContext controllerContext, string modelName,
                              Type modelType, ModelStateDictionary modelState)
    {
        SomeType temp = new SomeType();
        //assign values normally
        //If an error then add formatted date to ViewState
        controllerContext.Controller.ViewData.Add("FormattedDate",
                              temp.Date.ToShortDateString());
    }
}

And then use that in the view when creating the textbox ie :

<%= Html.TextBox("FormattedDate") %>

Hope that helps.

Answer 10

试试这个

<%:Html.TextBoxFor(m => m.FromDate, new { @Value = (String.Format("{0:dd/MM/yyyy}", Model.FromDate)) }) %>

Answer 11

MVC4 EF5 View I was trying to preload a field with today's date then pass it to the view for approval.

ViewModel.SEnd = DateTime.Now    //preload todays date  
return View(ViewModel)           //pass to view

In the view, my first code allowed an edit:

@Html.EditedFor(item.SEnd)        //allow edit

Later I changed it to just display the date, the user cannot change it but the submit triggers the controller savechanges

 <td>
 @Html.DisplyFor(item.SEnd)       //show no edit
 </td>

When I changed to DisplayFor I needed to add this to ensure the preloaded value was passed back to the controller. I also need to add HiddenFor's for every field in the viewmodel.

    @Html.HiddenFor(model => model.SEnd)     //preserve value for passback.

Beginners stuff but it took a while to work this out.

Answer 12

This worked for me: mvc 2

<%: Html.TextBoxFor(m => m.myDate, new { @value = Model.myDate.ToShortDateString()}) %>

Simple and sweet!

A comment of user82646, thought I'd make it more visible.