Question

我正尝试使用 AutoMapper 将Func<IQueryable<T>, IOrderedQueryable<T>>转换为Func<IQueryable<U>, IOrderedQueryable<U>>，如下所示：

MapperConfiguration config = new MapperConfiguration(cfg =>
{
   cfg.CreateMap<Func<IQueryable<T>, IOrderedQueryable<T>>, Func<IQueryable<U>, IOrderedQueryable<U>>>();
});
config.CreateMapper();
Mapper mapper = new Mapper(config);
var orderableOfU = mapper.Map<Func<IQueryable<U>, IOrderedQueryable<U>>>(orderableOfT);

但是它不起作用！我收到以下异常：

System.Func 2[System.Linq.IQueryable 1 [TanvirArjel.Application.DTOs.PostDetailsDto]，System.Linq.IOrderedQueryable`1 [TanvirArjel.Application.DTOs.PostDetailsDto]]需要具有0 args或仅可选的构造函数args。（参数“类型”）

这是我的通用类型：

public class Specification<T> where T : class
{
    public List<Expression<Func<T, bool>>> Conditions { get; set; } = new List<Expression<Func<T, bool>>>();
    public Func<IQueryable<T>, IIncludableQueryable<T, object>> Includes { get; set; }
    public List<string> IncludeStrings { get; } = new List<string>();
    public Func<IQueryable<T>, IOrderedQueryable<T>> OrderBy { get; set; }
    public (string ColumnName, string SortDirection) OrderByDynamic { get; set; }
    public Expression<Func<T, object>> GroupBy { get; set; }
    public int? Skip { get; set; }
    public int? Take { get; set; }
}

实际上，我正在尝试将Specification<Post>映射到Specification<PostDetailsDto>。任何帮助将不胜感激！

将Func <IQueryable <T>，IOrderedQueryable <T >>转换为Func <IQueryable <U>，IOrderedQueryable <U >>的最简单方法

0 个答案: