具有不同模板项的 Sitecore Glass Mapper 推断类型 Droptree 字段

Question

我有一个模板 BrochuresComponent，它有一个名为 Location 的字段，它是一个 droptree。现在在 sitecore 模板的字段上使用源代码，用户只能将国家项目或大陆项目添加到此下拉选项。我希望玻璃将选项中的国家项目映射到 ICountry 玻璃项目，将大陆项目映射到 Icontinent 玻璃项目。

但是当用户在下拉列表中选择一个选项时，其中一个 glassItem 值被填充，而其他值存在评估错误，导致模型出现错误。下面是我的代码片段。

我的 glass 界面如下所示：

    using Collette.Library.GlassItems.Objects.Taxonomy.Locations;
    using   Collette.Library.GlassItemsConstants.Objects.Page_Components.Destination_Page_Components;
    using Glass.Mapper.Sc.Configuration;
    using Glass.Mapper.Sc.Configuration.Attributes;

    namespace Collette.Library.GlassItems.Objects.Page_Components.Destination_Page_Components
    {
     [SitecoreType(TemplateId = BrochureComponentsConstants.TemplateIdString, AutoMap = true)]
     public interface IBrochuresComponent: IGlassItemEx
     {
          //Brochures Data Section
          [SitecoreField(FieldType = SitecoreFieldType.DropTree, FieldId = BrochureComponentsConstants.LocationItemFieldId, Setting = SitecoreFieldSettings.InferType)]
          ICountry Country { get; set; }

          [SitecoreField(FieldType = SitecoreFieldType.DropTree, FieldId = BrochureComponentsConstants.LocationItemFieldId, Setting = SitecoreFieldSettings.InferType)]
          IContinent Continent { get; set; }

   }
}

我的模型如下所示：

  var sitecoreContext = new SitecoreContext();
  BrochuresComponentItem = sitecoreContext.Cast<IBrochuresComponent>(DisplayItem); 
  //IF we specified a continent in dropdown it works fine since that is the first condition so it does not go to else,
  //but if we specify a country in the dropdown it breaks at the if condition below stating that templateid is empty string since nothing was evaluated.

不允许空字符串。参数名称：fieldName

  if (BrochuresComponentItem.Continent != null && BrochuresComponentItem.Continent.TemplateId.Equals(ContinentConstants.TemplateId))
   {
      SetBrochures(BrochuresComponentItem.Continent);
   }
   else if (BrochuresComponentItem.Country != null && BrochuresComponentItem.Country.TemplateId.Equals(CountryConstants.TemplateId))
   {
     SetBrochures(BrochuresComponentItem.Country);
   }

Answer 1

您关于推断类型工作方式的 implementation/understanding 是错误的，请阅读 Glass tutorial for Inferred Types。

为了使其正常工作，您的 Country 和 Continent 模板需要有一个共同的基础，然后您可以使用 infertype 映射到特定类型：

 [SitecoreType(TemplateId = BrochureComponentsConstants.TemplateIdString, AutoMap = true)]
 public interface IBrochuresComponent: IGlassItemEx
 {
      //Brochures Data Section
      [SitecoreField(FieldType = SitecoreFieldType.DropTree, FieldId = BrochureComponentsConstants.LocationItemFieldId, Setting = SitecoreFieldSettings.InferType)]
      ILocationBase Location { get; set; }
}

然后在你的代码上你可以检查它映射到的类型：

if (BrochuresComponentItem.Location != null)
{
    if (BrochuresComponentItem.Location is ICountry)
    {
        //do country specific thing
    }
    else if (BrochuresComponentItem.Location is IContinent)
    {
        // do continent specific thing
    }
}

确保 ICountry 和 IContinent 的模型继承自公共基础接口以匹配基础数据模板，ILocationBase

具有不同模板项的 Sitecore Glass Mapper 推断类型 Droptree 字段

Sitecore Glass Mapper Infer Type Droptree Field with different template items

asp.net

sitecore

sitecore7

sitecore7.2

glass-mapper