NopCommerce架构分析之(八)多语言支持

namespace Nop.Web.Framework.Localization 
{ 
  public delegate LocalizedString Localizer(string text, params object[] args); 
}

// 摘要: 
//   表示不应再次进行编码的 HTML 编码的字符串。 
public interface IHtmlString 
{ 
  // 摘要: 
  //   返回 HTML 编码的字符串。 
  // 
  // 返回结果: 
  //   HTML 编码的字符串。 
  string ToHtmlString(); 
} 

public static HelperResult LocalizedEditor<T, TLocalizedModelLocal>(this HtmlHelper<T> helper, string name, 
  Func<int, HelperResult> localizedTemplate, 
  Func<T, HelperResult> standardTemplate) 
  where T : ILocalizedModel<TLocalizedModelLocal> 
  where TLocalizedModelLocal : ILocalizedModelLocal 
{ 
  return new HelperResult(writer => 
  { 
    if (helper.ViewData.Model.Locales.Count > 1) 
    { 
      var tabStrip = helper.Telerik().TabStrip().Name(name).Items(x => 
      { 
        x.Add().Text("Standard").Content(standardTemplate(helper.ViewData.Model).ToHtmlString()).Selected(true); 
        for (int i = 0; i < helper.ViewData.Model.Locales.Count; i++) 
        { 
          var locale = helper.ViewData.Model.Locales[i]; 
          var language = EngineContext.Current.Resolve<ILanguageService>().GetLanguageById(locale.LanguageId); 
          x.Add().Text(language.Name) 
            .Content(localizedTemplate 
              (i). 
              ToHtmlString 
              ()) 
            .ImageUrl("~/Content/images/flags/" + language.FlagImageFileName); 
        } 
      }).ToHtmlString(); 
      writer.Write(tabStrip); 
    } 
    else 
    { 
      standardTemplate(helper.ViewData.Model).WriteTo(writer); 
    } 
  }); 
}

namespace Nop.Web.Models.News 
{ 
  public partial class AddNewsCommentModel : BaseNopModel 
  { 
    [NopResourceDisplayName("News.Comments.CommentTitle")] 
    [AllowHtml] 
    public string CommentTitle { get; set; } 
 
    [NopResourceDisplayName("News.Comments.CommentText")] 
    [AllowHtml] 
    public string CommentText { get; set; } 
 
    public bool DisplayCaptcha { get; set; } 
  } 
}

public static MvcHtmlString NopLabelFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue expression, bool displayHint = true) 
{ 
  var result = new StringBuilder(); 
  var metadata = ModelMetadata.FromLambdaExpression(expression, helper.ViewData); 
  var hintResource = string.Empty; 
  object value = null; 
  if (metadata.AdditionalValues.TryGetValue("NopResourceDisplayName", out value)) 
  { 
    var resourceDisplayName = value as NopResourceDisplayName; 
    if (resourceDisplayName != null && displayHint) 
    { 
      var langId = EngineContext.Current.Resolve<IWorkContext>().WorkingLanguage.Id; 
      hintResource = 
        EngineContext.Current.Resolve<ILocalizationService>() 
        .GetResource(resourceDisplayName.ResourceKey + ".Hint", langId); 

      result.Append(helper.Hint(hintResource).ToHtmlString()); 
    } 
  } 
  result.Append(helper.LabelFor(expression, new { title = hintResource })); 
  return MvcHtmlString.Create(result.ToString()); 
}