如何将IQueryable表达式树转换为Lambda

Question

如何将IQueryable Expression树转换为Expression<Func<T,bool>>表达式。

IQueryable<Book> Books; 

var query = Books.Where(p => p.Author.AuthorId == 5); 

Expression<Func<Book, bool>> expression = ????? 

Answer 1

您使用IQueryable.Expression属性来访问的IQueryable的表达树。

Answer 2

Expression<Func<Book, bool>> expression = p => p.Author.AuthorId == 5;