方法“ProjectTo”没有重载需要 0 arguments

Question

Error

    Severity    Code    Description Project File    Line    Suppression State
    Error   CS1501  No overload for method 'ProjectTo' takes 0 arguments

C#

       public static async Task<PagedResult<U>> GetPagedAsync<T, U>(this IQueryable<T> query, int page, int pageSize) where U : class
    {

        var result = new PagedResult<U>();
        result.CurrentPage = page;
        result.PageSize = pageSize;
        result.RowCount = await query.CountAsync();

        var pageCount = (double)result.RowCount / pageSize;
        result.PageCount = (int)Math.Ceiling(pageCount);

        var skip = (page - 1) * pageSize;
        result.Results = await query.Skip(skip)
                                     .Take(pageSize)
                                     .ProjectTo<U>()
                                     .ToListAsync();
        return result;
    }

I am getting above error after migration core 6.0 to core 7.0

Answer 1

ProjectTo methods provided by AutoMapper.QueryableExtensions require IConfigurationProvider . You can use one from IMapper or try resolving IConfigurationProvider directly:

IMapper mapper = ...; // resolve from the DI

var result = query
   .ProjectTo<SomeClass>(mapper.ConfigurationProvider)
   // ...
   ;

Or

IConfigurationProvider cfg = ...; // resolve from the DI

var result = query
   .ProjectTo<SomeClass>(cfg)
   // ...
   ;