A token resolver

gistfile1.cs

public class TagInformationResolver: IResolver
{
  //The cache keeps track of the last n tags so we don't have to keep going to the database
  //for data which isn't really changing
  private static TagCache{get; set;}
  
  public TagInformationResolver(ITagRepository tagRepository)
  {//we could probably make the cache responsible for resolving its own information but that limits our ability
   //to use dependency injection for different strategies. 
    TagCache.SetResolver(tagRepository);
  }

  public string TryResolve(string token, int tagId)
  {
    string result;
    switch(token){
      case "TAGNUMBER":
        result = TagCache.GetTagById(Id).Name;
      case "TAGTYPE":
        result = TagCache.GetTagById(Id).TagType;
      default:
        result = null;
    }
    return result;
  }
}