使用Ebay SDK获取每个类别中的项目数

Question

Bellow Ebay SDK代码仅提供类别及其ID。但我想获得每个类别中的项目数量。知道我需要在这个代码上改变什么属性呢？感谢

eBay.Service.Call.GetCategoriesCall getCategories = new GetCategoriesCall();
            getCategories.ApiContext.SoapApiServerUrl = "https://api.sandbox.ebay.com/wsapi";
            getCategories.ApiContext.ApiCredential.eBayToken = your_token;
            getCategories.CategorySiteID = "0";
            getCategories.LevelLimit = 2;
            getCategories.DetailLevelList.Add(DetailLevelCodeType.ReturnAll);
            var categories = getCategories.GetCategories();