显示值转换器，用于ASP.MVC

Question

I have a few models that contain country ISO codes. I would like to display these with the actual country name instead of just the ISO value.

So in a generic sense, I have keys in my model, I have the definition of those keys in a dictionary, I would like to display the definition in the UI.

Having recently worked mostly in WPF, there I would create a converter which I could just reference in the UI binding whenever I wanted to translate a value (even bidirectional). If there is a similar out-of-the-box concept in ASP.MVC that would be ideal.

Alternatively I could add the country names as attributes to the model, but that feels kludgy.

I could certainly roll my own custom converter solution, but would prefer to stick to best practices so any guidance is much appreciated.

Answer 1

A HtmlHelper might be an elegant solution for your problem.

First, you declare a HtmlHepler like this:

public static class CountryHTMLHelpers
 {
      //Initialize your dictionary here
      public static Dictionary<string, string> CountryDictionary;          

      public static IHtmlString ISOToCountry(this HtmlHelper helper, string iso)
      {
          string countryName = CountryDictionary[iso];
          return new HtmlString(countryName);
      }

      public static IHtmlString CountryToISO(this HtmlHelper helper, string country)
      {
          string iso = CountryDictionary.FirstOrDefault(x => x.Value == country).Key;
          return new HtmlString(iso);
      }
}

To use these helpers in your views:

@Html.ISOToCountry(Model.ISO) //Print the country
@Html.CountryToISO("England") //Print the ISO