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TranslateAttribute for my asp.net-mvc site

In my current project, I have a custom ViewData that has (among other things) the following properties:

CustomViewData
  + IList <Language> siteLangauges
  + Language CurrentLanguage
  + T9nProvider

My whole url looks like this:

http://someUrl.com/ {siteLanguage} / {restOfUrlIncludingcontrollersAndACtions}

I want to create an ActionAttribute that catches every request, checks what the siteLanguage value is, and sets the language value to CustomViewData. My current (non-working) code looks like this:

public class TranslateAttribute: ActionFilterAttribute, IActionFilter
{
    void IActionFilter.OnActionExecuting(ActionExecutingContext filterContext)
    {
        ViewDataDictionary viewData = filterContext.Controller.ViewData;
        if (viewData is CustomViewData) { 
            (viewData as CustomViewData).Language = new Language(filterContext.ActionParameters["siteLanguage"] as string));
        }
        base.OnActionExecuting(filterContext);
    }

    void IActionFilter.OnActionExecuted(ActionExecutedContext filterContext)
    {
        base.OnActionExecuted(filterContext);
    }
}

The first problem is that viewdata is never customviewdata. Why not?

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2 answers


You can set the ViewData on the controller to not just create a constructor for CustomViewData that takes a ViewData object and do the following:



var customData = new CustomViewData( filterContext.Controller.ViewData);
customData.Language = new Language(filterContext.ActionParameters["siteLanguage"] as string));
filterContext.Controller.ViewData = customData;
base.OnActionExecuting( filterContext );
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if (viewData is CustomViewData)

This is a very strange test. What is he doing?

I suggest you give it up.



You don't need to call the base implementation - base.OnAction ...

You also don't need to output from the IActionFilter. Derive from ActionFilterAttribute, which is sufficient.

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