合并两个集合与Automapper由条件 [英] Merge two collections with Automapper by condition

问题描述

有两种类型：

1）DTO类型：

[DataContract]
public sealed class OrderDetailDto
{
    [DataMember]
    public Guid MergeId { get; set; }
    [DataMember]
    public int Id { get; set; }
    [DataMember]
    public string PostionName { get; set; }
    [DataMember]
    public decimal Quantity { get; set; }
    [DataMember]
    public byte[] Version { get; set; }
}

2），对应域类型：

2) corresponding domain type:

public sealed class OrderDetail
{
    public Guid MergeId { get; set; }
    public int Id { get; set; }
    public string PostionName { get; set; }
    public decimal Quantity { get; set; }
    public byte[] Version { get; set; }
}

和两个集合：收藏<的OrderDetail> 和收集和LT; OrderDetailDto> 。

收集和LT; OrderDetailDto> 的数据的变化，这是什么地方的。现在我想将这些修改收集和LT;&的OrderDetail GT; ，使用Automapper。

Collection<OrderDetailDto> has data changes, that was made somewhere. Now I want to apply these changes to Collection<OrderDetail>, using Automapper.

为了简单起见，我们认为，这项数的在这些集合是相等的，但是项目的为了的可能不同。

For simplicity, let's think, that items count in these collections are equal, but the order of items may differ.

要正确映射藏品，我想用 MergeId 属性。我需要的是这样的：

To map collection items correctly, I want to use MergeId property. I need something like this:

Mapper.CreateMap<Collection<OrderDetailDto>, Collection<OrderDetail>>()
  .MappingExpression((dto, do) => dto.MergeId == do.MergeId);

这是可以做到与Automapper？

Is this possible to do with Automapper?

推荐答案

我还没有发现比使用自定义转换器像下面更好的解决方案。

I have not found better solution than using custom converter like below.

    public class Converter : ITypeConverter<Collection<OrderDetailDto>, Collection<OrderDetail>>
    {
        public Collection<OrderDetail> Convert(ResolutionContext context)
        {
            var destCollection = (Collection<OrderDetail>) context.DestinationValue;
            var sourceCollection = (Collection<OrderDetailDto>)context.SourceValue;
            foreach (var source in sourceCollection)
            {
                var dest = destCollection.SingleOrDefault(d => d.MergeId == source.MergeId);
                Mapper.Map(source, dest);
            }
            return destCollection;
        }
    }

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