Csharp 如何使用Automapper映射两个嵌套列表

实体

public class PurchaseReq
{
    ...
    public string PrNumber { get; set; } // primary key
    public List<PurchaseReqItem> PurchaseReqItems { get; init; } = [];
    public List<PurchaseReqCharge> PurchaseReqCharges { get; init; } = [];
}

public class PurchaseReqItem
{
    ...
    public int Id { get; init; } // primary key
    public string PrNumber { get; set; } // foreign key
    public PurchaseReq PurchaseReq { get; init; } //navigation property
}

public class PurchaseReqCharge
{
    ...
    public int Id { get; init; } // primary key
    public string PrNumber { get; set; } // foreign key
    public PurchaseReq PurchaseReq { get; init; } //navigation property
}

Dtos

public class PurchaseReqDto
{
    ...
    public string PrNumber { get; set; }
    public List<PurchaseReqItemDto> PurchaseReqItems { get; init; } = [];
    public List<PurchaseReqChargeDto> PurchaseReqCharges { get; init; } = [];
}

public class PurchaseReqItemDto
{
    ...
    public int Id { get; init; }
    public string PrNumber { get; set; }
    public PurchaseReqDto PurchaseReq { get; init; }
}

public class PurchaseReqChargeDto
{
    ...
    public int Id { get; init; }
    public string PrNumber { get; set; }
    public PurchaseReqDto PurchaseReq { get; init; }
}

映射配置文件

public class PurchaseReqProfile : Profile
{
    public PurchaseReqProfile()
    {
        CreateMap<PurchaseReq, PurchaseReqDto>();
        
        CreateMap<PurchaseReqDto, PurchaseReq>()
            .ForMember(d => d.PurchaseReqItems, o => o.MapFrom(src => src.PurchaseReqItems))
            .ForMember(d => d.PurchaseReqCharges, o => o.MapFrom(src => src.PurchaseReqCharges));
    }
}

public class PurchaseReqItemProfile : Profile
{
    public PurchaseReqItemProfile()
    {
        CreateMap<PurchaseReqItem, PurchaseReqItemDto>();
        
        CreateMap<PurchaseReqItemDto, PurchaseReqItem>()
            .ForMember(d => d.TaxRate, o => o.Ignore());
    }
}

public class PurchaseReqChargeProfile : Profile
{
    public PurchaseReqChargeProfile()
    {
        CreateMap<PurchaseReqCharge, PurchaseReqChargeDto>();
        
        CreateMap<PurchaseReqChargeDto, PurchaseReqCharge>()
            .ForMember(d => d.OtherCharge, o => o.Ignore());
    }
}

AutoMapper添加到服务Program.cs AutoMapper版本13.0.1 builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());

取PurchaseReqRepo的数据

public async Task<PurchaseReq> GetPrForUpdateAsync(string prNumber)
    {
        ArgumentNullException.ThrowIfNull(prNumber);

        return await context.PurchaseReqs
            .Include(pr => pr.PurchaseReqItems)
            .Include(pr => pr.PurchaseReqCharges)
            .SingleOrDefaultAsync(pr => pr.PrNumber == prNumber);
    }

更新 API

[HttpPut]
[CanUserUpdate(RolesConstant.PurchaseReq)]
public async Task<IActionResult> UpdatePurchaseReq([FromBody] PurchaseReqDto purchaseReqDto)
{
    if (!short.TryParse(User.Claims.FirstOrDefault(c => c.Type == "sub")?.Value,out var userId))
        return Unauthorized();
        
    var purchaseReq = await purchaseReqRepo.GetPrForUpdateAsync(purchaseReqDto.PrNumber);
    if (purchaseReq == null)
        return NotFound();
        
    if (purchaseReq.IsSubmitted)
        return BadRequest(string.Format($"PR ({purchaseReq.PrNumber}) was already submitted for approval and can't be updated."));
        
    mapper.Map(purchaseReqDto, purchaseReq, options => 
        options.BeforeMap((prDto, pr) =>
        {
            pr.RemoveUnMatchedItems(prDto.PurchaseReqItems);
            pr.RemoveUnMatchedCharges(prDto.PurchaseReqCharges);
        }));
        
    purchaseReq.UpdateBy(userId);
        
    await purchaseReqRepo.SaveChangesAsync();

    return NoContent();
}

当将purchaseReqDto映射到purchaseReq时，我得到错误:

AutoMapper，System. InvalidOperationExcept:实体的实例 无法跟踪类型"AcquiseReqCharge"，因为另一个实例 已在跟踪具有密钥值"{Id:3}"的.当附接 现有实体，确保只有一个实体实例具有给定 附加了关键值.

我不知道我做错了什么.