c# - NHibernate.Search 预测

Question

我正在尝试使用 NHibernate.Search 通过投影获得 Lucene.NET 分数。

我的领域对象实现了一个接口(interface) IScorableEntity

public interface IScorableEntity
{
    float Score { get; set; }
}

...

IFullTextSession session = Search.CreateFullTextSession(database.Session);
IFullTextQuery textQuery = session.CreateFullTextQuery(query, typeof(Book));
textQuery.SetProjection(ProjectionConstants.SCORE);
var books = textQuery.List<Book>();

没有分数投影一切正常，但有一个异常(exception):

InvalidCastException : At least one element in the source array could not be cast down to the destination array type.

Answer 1

发现自己，我需要为此使用 2 个投影

textQuery.SetProjection(ProjectionConstants.SCORE, ProjectionConstants.THIS);

var list = textQuery.List();

var books = new List<Book>();
foreach(object[] o in list)
{
    var book= o[1] as Book;
    if (book!= null)
    {
        book.Score = (float)o[0];
    }
    books.Add(book);
}

return books;