asp.net mvc 3 - How to set the culture of all ValueProviderResult used in model binding to a given value? -

it turns out mvc's defaultmodelbinder uses different cultures in order parse values (e.g. double, datetime, etc.) post vs requests. here more info.

i see controlled culture property of valueproviderresult objects, returned ivalueprovider.getvalue().

my question is: how can globally make sure value cultureinfo.invariantculture.

i know can implement custom value providers , way.

i know can implement custom model binders , way.

i know can set culture in thread, unfortunately not option in case.

what looking way set default model binder , existing value providers able parse in culture invariant way, irrespective of thread culture set to.

as far know, there no way match criteria. will have 1 of things know can (i'd proper way custom value provider).

reason: default valueproviders hardcoded use either cultureinfo.invariantculture or cultureinfo.currentculture.

here, specifically, way formvalueprovider it:

internal formvalueprovider(             controllercontext controllercontext,             iunvalidatedrequestvalues unvalidatedvalues          )          : base(               controllercontext.httpcontext.request.form,                unvalidatedvalues.form,               cultureinfo.currentculture // <--- grrr, argh          )  { } 

the culture isn't retrieved anywhere else (i.e., argument above isn't used default, 1 culture use).

cultures of different ivalueproviders

for reference, these cultures each of default ivalueproviders:

• childactionvalueprovider: invariantculture
• formvalueprovider: currentculture
• jsonvalueprovider: currentculture
• routedatavalueprovider: invariantculture
• querystringvalueprovider: invariantculture
• httpfilecollectionvalueprovider: invariantculture

replacing currentculture ivalueproviders

it isn't huge task replace formvalueprovider, since, seen above, calls base class' (namevaluecollectionvalueprovider) constructor - takes desired culture argument.

the original implementation of formvalueprovider appears on surface harder is, references internal classes , interfaces. they're not needed in order replace provider - they're there unit testing.

you need call base constructor (as mentioned above), passing 2 namevaluecollections easy acquire: request.forms , forms property of validation.unvalidated(request) (a static method). , set third argument culture want.

the formvalueproviderfactory more straightforward.

jsonvalueprovider bit more involved - you'd have copy source of jsonvalueproviderfactory new class , modify - because although allows overriding getvalueprovider(), method consists of calls other private static methods.

edit (petar ivanov): worked me. in order make work not enough add custom factory valueproviderfactories.factories, because way it's added after formvalueproviderfactory. instead, had replace formvalueproviderfactory custom one.