ASP.NET MVC2 and DateTime Format

问题

I am using ASP.NET MVC2 with MvcContrib.FluentHtml to do form binding.

I want to bind a DateTime format to a textbox with specific datetime format.

<%=this.TextBox(c => c.date_a).Class("readonly text-box") %>
// PS. c.date_a is a DateTime

gives me

<input type="text" value="5/9/2009 12:00:00 AM" name="date_a" id="datea" class="readonly text-box">

However, I'd like to override the default datetime format. e.g.

value="2009-5-9" 
value="9-5-09" 
value="09May9"

I know I can override the value by specific a value, however, the date should also bind to the object class on POST the form.

How to do "minimum" code to override the default datetime format of a specific field on UI?

回答1:

With FluentHtml you can do like this:

<%=this.TextBox(c => c.date_a).Class("readonly text-box").Format("yyyy-M-d") %>

回答2:

I don't know if this work with MvcContrib MvcContrib.FluentHtml but without it, it is very simple, add to your model property

[DisplayFormat(DataFormatString="{0:MM/dd/yyyy}", ApplyFormatInEditMode=true)]

and in your view

m.DateProperty) %>

I Don't know if MvcContrib uses Attributes but if it doesn't, it should, that way, you'll always have your date the same format, specifying the format only once...

hope this help

回答3:

First, add this extension for getting property path:

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 extensions for HtmlHalper:

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" }) %>

回答4:

I often run into situations where it's impractical to modify the model (with attributes etc) so being able to implement a solution like Сергій's is important. To Dennis Cheung point though, you can more tightly bind this solution as follows:

public static MvcHtmlString DateBoxFor<TModel>(this HtmlHelper<TModel> helper, Expression<Func<TModel, DateTime?>> property)
{
    return helper.DateBoxFor(property, "d", null);
}

public static MvcHtmlString DateBoxFor<TModel>(this HtmlHelper<TModel> helper, Expression<Func<TModel, DateTime?>> property, string format, object htmlAttributes)
{
    var viewData = helper.ViewContext.ViewData;
    var date = property.Compile().Invoke(viewData.Model);
    var value = date.HasValue ? date.Value.ToString(format) : string.Empty;
    var name = viewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(property));

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

Then you call it like this:

<%:Html.DateBoxFor(m => m.SomeDate)%>

Or like this:

<%:Html.DateBoxFor(m => m.SomeDate, "d", null)%>

回答5:

I am not sure whether this would cause you problems when the value is posted back but the following syntax should allow you to change the format with which the date value is displayed.

<%=this.TextBox(c => c.date_a.ToString('yyyy-M-d')).Class("readonly text-box") %>

You will find further information on how to construct the format strings here.

来源：https://stackoverflow.com/questions/2227742/asp-net-mvc2-and-datetime-format

标签

asp.net-mvc

data-binding

asp.net-mvc-2

datetime-format