我的数据模型是：
public class Category
{
public Guid Id { get; set; }
public List<Category> children { get; set; }
}
我想要的只是从任何级别的嵌套中获取数据。
我为此创建了一个索引：
public class CategoriesIndex :
AbstractIndexCreationTask<Category, CategoriesIndex.ReduceResult>
{
public class ReduceResult
{
public Guid Id { get; set; }
public Category Category { get; set; }
}
public CategoriesIndex()
{
Map = categories =>
from category in categories
from subcategory in category.Hierarchy(x=>x.children)
select new {
Id = subcategory.Id,
Category = subcategory
};
Store(x => x.Id, FieldStorage.Yes);
Store(x => x.Category, FieldStorage.Yes);
}
}
运行该代码后，我遇到了异常
网址：“/indexes/CategoriesIndex”
System.InvalidOperationException：源代码。
怎么了？如果是我如何索引分层数据？
PS 由于某些限制，我无法更改数据模型
更新
我收到了异常的消息：
public class Index_CategoriesIndex : AbstractViewGenerator
{
public Index_CategoriesIndex()
{
this.ViewText = @"docs.Categories.SelectMany(category => category.Hierarchy(x => x.children), (category, subcategory) => new() {
Id = subcategory.Id,
Category = subcategory
})";
this.ForEntityNames.Add("Categories");
this.AddMapDefinition(docs => docs.Where(__document => __document["@metadata"]["Raven-Entity-Name"] == "Categories").SelectMany((Func<dynamic, IEnumerable<dynamic>>)(category => (IEnumerable<dynamic>)(category.Hierarchy(x => x.children))), (Func<dynamic, dynamic, dynamic>)((category, subcategory) => new { Id = subcategory.Id, Category = subcategory, __document_id = category.__document_id })));
this.AddField("Id");
this.AddField("Category");
this.AddField("__document_id");
}
} e:\RavenDB\Web\Tenants\RavenPortalAuth\IndexDefinitions\TemporaryIndexDefinitionsAsSource\4jy1udpm.0.cs(21,223) :
error CS1977: Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type