Question

我正在尝试从一个对象映射到另一个具有公共只读Guid Id的对象，我想忽略它。我试过这样的：

Mapper.CreateMap<SearchQuery, GetPersonsQuery>()
              .ForMember(dto => dto.Id, opt => opt.Ignore());

这似乎失败了因为Id是只读的：

AutoMapperTests.IsValidConfiguration threw exception: 
System.ArgumentException: Expression must be writeable

有什么方法吗？

Answer 1

我不认为AutoMapper支持ReadOnly字段。只有我可以让它工作的方法是用只有getter的属性包装readonly字段：

class Program
{
    static void Main()
    {
        Mapper.CreateMap<SearchQuery, GetPersonsQuery>();

        var source = new SearchQuery {Id = Guid.NewGuid(), Text = Guid.NewGuid().ToString() };

        Console.WriteLine("Src: id = {0} text = {1}", source.Id, source.Text);

        var target = Mapper.Map<SearchQuery, GetPersonsQuery>(source);

        Console.WriteLine("Tgt: id = {0} text = {1}", target.Id, target.Text);

        Console.ReadLine();
    }
}

internal class GetPersonsQuery
{
    private readonly Guid _id = new Guid("11111111-97b9-4db4-920d-2c41da24eb71");

    public Guid Id { get { return _id; } }
    public string Text { get; set; }
}

internal class SearchQuery
{
    public Guid Id { get; set; }
    public string Text { get; set; }
}

Automapper忽略只读属性

1 个答案: