MVC DateTime binding with incorrect date format

2019-01-02 16:57发布

Asp.net-MVC now allows for implicit binding of DateTime objects. I have an action along the lines of

public ActionResult DoSomething(DateTime startDate) 
{ 
... 
}

This successfully converts a string from an ajax call into a DateTime. However, we use the date format dd/MM/yyyy; MVC is converting to MM/dd/yyyy. For example, submitting a call to the action with a string '09/02/2009' results in a DateTime of '02/09/2009 00:00:00', or September 2nd in our local settings.

I don't want to roll my own model binder for the sake of a date format. But it seems needless to have to change the action to accept a string and then use DateTime.Parse if MVC is capable of doing this for me.

Is there any way to alter the date format used in the default model binder for DateTime? Shouldn't the default model binder use your localisation settings anyway?

10条回答
看风景的人
2楼-- · 2019-01-02 17:15

It is also worth noting that even without creating your own model binder multiple different formats may be parsable.

For instance in the US all the following strings are equivalent and automatically get bound to the same DateTime value:

/company/press/may%2001%202008

/company/press/2008-05-01

/company/press/05-01-2008

I'd strongly suggest using yyyy-mm-dd because its a lot more portable. You really dont want to deal with handling multiple localized formats. If someone books a flight on 1st May instead of 5th January you're going to have big issues!

NB: I'm not clear exaclty if yyyy-mm-dd is universally parsed in all cultures so maybe someone who knows can add a comment.

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与君花间醉酒
3楼-- · 2019-01-02 17:17

I've been having the same issue with short date format binding to DateTime model properties. After looking at many different examples (not only concerning DateTime) I put together the follwing:

using System;
using System.Globalization;
using System.Web.Mvc;

namespace YourNamespaceHere
{
    public class CustomDateBinder : IModelBinder
    {
        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            if (controllerContext == null)
                throw new ArgumentNullException("controllerContext", "controllerContext is null.");
            if (bindingContext == null)
                throw new ArgumentNullException("bindingContext", "bindingContext is null.");

            var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);

            if (value == null)
                throw new ArgumentNullException(bindingContext.ModelName);

            CultureInfo cultureInf = (CultureInfo)CultureInfo.CurrentCulture.Clone();
            cultureInf.DateTimeFormat.ShortDatePattern = "dd/MM/yyyy";

            bindingContext.ModelState.SetModelValue(bindingContext.ModelName, value);

            try
            {
                var date = value.ConvertTo(typeof(DateTime), cultureInf);

                return date;
            }
            catch (Exception ex)
            {
                bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex);
                return null;
            }
        }
    }

    public class NullableCustomDateBinder : IModelBinder
    {
        public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            if (controllerContext == null)
                throw new ArgumentNullException("controllerContext", "controllerContext is null.");
            if (bindingContext == null)
                throw new ArgumentNullException("bindingContext", "bindingContext is null.");

            var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);

            if (value == null) return null;

            CultureInfo cultureInf = (CultureInfo)CultureInfo.CurrentCulture.Clone();
            cultureInf.DateTimeFormat.ShortDatePattern = "dd/MM/yyyy";

            bindingContext.ModelState.SetModelValue(bindingContext.ModelName, value);

            try
            {
                var date = value.ConvertTo(typeof(DateTime), cultureInf);

                return date;
            }
            catch (Exception ex)
            {
                bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex);
                return null;
            }
        }
    }
}

To keep with the way that routes etc are regiseterd in the Global ASAX file I also added a new sytatic class to the App_Start folder of my MVC4 project named CustomModelBinderConfig:

using System;
using System.Web.Mvc;

namespace YourNamespaceHere
{
    public static class CustomModelBindersConfig
    {
        public static void RegisterCustomModelBinders()
        {
            ModelBinders.Binders.Add(typeof(DateTime), new CustomModelBinders.CustomDateBinder());
            ModelBinders.Binders.Add(typeof(DateTime?), new CustomModelBinders.NullableCustomDateBinder());
        }
    }
}

I then just call the static RegisterCustomModelBinders from my Global ASASX Application_Start like this:

protected void Application_Start()
{
    /* bla blah bla the usual stuff and then */

    CustomModelBindersConfig.RegisterCustomModelBinders();
}

An important note here is that if you write a DateTime value to a hiddenfield like this:

@Html.HiddenFor(model => model.SomeDate) // a DateTime property
@Html.Hiddenfor(model => model) // a model that is of type DateTime

I did that and the actual value on the page was in the format "MM/dd/yyyy hh:mm:ss tt" instead of "dd/MM/yyyy hh:mm:ss tt" like I wanted. This caused my model validation to either fail or return the wrong date (obviously swapping the day and month values around).

After a lot of head scratching and failed attempts the solution was to set the culture info for every request by doing this in the Global.ASAX:

protected void Application_BeginRequest()
{
    CultureInfo cInf = new CultureInfo("en-ZA", false);  
    // NOTE: change the culture name en-ZA to whatever culture suits your needs

    cInf.DateTimeFormat.DateSeparator = "/";
    cInf.DateTimeFormat.ShortDatePattern = "dd/MM/yyyy";
    cInf.DateTimeFormat.LongDatePattern = "dd/MM/yyyy hh:mm:ss tt";

    System.Threading.Thread.CurrentThread.CurrentCulture = cInf;
    System.Threading.Thread.CurrentThread.CurrentUICulture = cInf;
}

It won't work if you stick it in Application_Start or even Session_Start since that assigns it to the current thread for the session. As you well know, web applications are stateless so the thread that serviced your request previously is ot the same thread serviceing your current request hence your culture info has gone to the great GC in the digital sky.

Thanks go to: Ivan Zlatev - http://ivanz.com/2010/11/03/custom-model-binding-using-imodelbinder-in-asp-net-mvc-two-gotchas/

garik - https://stackoverflow.com/a/2468447/578208

Dmitry - https://stackoverflow.com/a/11903896/578208

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明月照影归
4楼-- · 2019-01-02 17:20

I would globally set your cultures. ModelBinder pick that up!

  <system.web>
    <globalization uiCulture="en-AU" culture="en-AU" />

Or you just change this for this page.
But globally in web.config I think is better

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君临天下
5楼-- · 2019-01-02 17:22

I've just found the answer to this with some more exhaustive googling:

Melvyn Harbour has a thorough explanation of why MVC works with dates the way it does, and how you can override this if necessary:

http://weblogs.asp.net/melvynharbour/archive/2008/11/21/mvc-modelbinder-and-localization.aspx

When looking for the value to parse, the framework looks in a specific order namely:

  1. RouteData (not shown above)
  2. URI query string
  3. Request form

Only the last of these will be culture aware however. There is a very good reason for this, from a localization perspective. Imagine that I have written a web application showing airline flight information that I publish online. I look up flights on a certain date by clicking on a link for that day (perhaps something like http://www.melsflighttimes.com/Flights/2008-11-21), and then want to email that link to my colleague in the US. The only way that we could guarantee that we will both be looking at the same page of data is if the InvariantCulture is used. By contrast, if I'm using a form to book my flight, everything is happening in a tight cycle. The data can respect the CurrentCulture when it is written to the form, and so needs to respect it when coming back from the form.

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荒废的爱情
6楼-- · 2019-01-02 17:23
  public class DateTimeFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (filterContext.HttpContext.Request.RequestType == "GET")
        {

            foreach (var parameter in filterContext.ActionParameters)
            {
                var properties = parameter.Value.GetType().GetProperties();

                foreach (var property in properties)
                {
                    Type type = Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType;

                    if (property.PropertyType == typeof(System.DateTime) || property.PropertyType == typeof(DateTime?))
                    {
                        DateTime dateTime;

                        if (DateTime.TryParse(filterContext.HttpContext.Request.QueryString[property.Name], CultureInfo.CurrentUICulture, DateTimeStyles.None, out dateTime))
                            property.SetValue(parameter.Value, dateTime,null);
                    }
                }

            }
        }
    }
}
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余生请多指教
7楼-- · 2019-01-02 17:29

I set the below config on my MVC4 and it works like a charm

<globalization uiCulture="auto" culture="auto" />
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