AutoMapper 自訂對應關系

Aug 5, 2014

3 mins read

AutoMapper
Auto mapper
在來源和目的物件中，如果屬性名稱和型態都相同的話，AutoMapper會自動轉換 但通常事情不會這麼單純，很多時後我們會需要指定轉換的方式，用一個簡單的例子來說明
首先是來源的Model物件
public class DemoModel
{
    public int CustId { get; set; }
    public string CustName { get; set; }
    public bool CustGender { get; set; }
}
再來是要轉換的ViewModel物件
public class DemoViewModel
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string FullName { get; set; }
    public string Gender { get; set; }
    public DateTime Date { get; set; }
}
轉換的設定方式 Ignore是用來略過對應，不給值 MapFrom是用來指定對應的屬性名稱，或是組合多個屬性值 ResolveUsing是指定自訂的型別轉換方式 UseValue是在轉換的過程中直接給值 NullSubstitute是在原始值為空的時後才給值 Condition傳入一個條件為true才給值
public class Class1
{
    public void GetViewModel()
    {
        Mapper.CreateMap<DemoModel, DemoViewModel>()
            .ForMember(dest => dest.Id, opt => opt.Ignore())
            .ForMember(dest => dest.Name, opt => opt.MapFrom(src => src.CustName))
            .ForMember(dest => dest.FullName, opt => opt.MapFrom(src => string.Format("{0}:{1}", src.CustId, src.CustName)))
            .ForMember(dest => dest.Gender, opt => opt.ResolveUsing<GenderResolver>().FromMember(src => src.CustGender))
            .ForMember(dest => dest.Date, opt => opt.UseValue<DateTime>(DateTime.Now));

    DemoModel model = new DemoModel
    {
        CustId = 123,
        CustName = "abc",
        CustGender = true
    };

    DemoViewModel viewModel = Mapper.Map&lt;DemoModel, DemoViewModel&gt;(model);
    Console.WriteLine("id:{0}, name:{1}, fullname:{2}, gender:{3}, date:{4}", viewModel.Id, viewModel.Name, viewModel.FullName, viewModel.Date, viewModel.Gender);
}

private class GenderResolver : ValueResolver&lt;bool, string&gt;
{
    protected override string ResolveCore(bool source)
    {
        return source ? "男" : "女";
    }
}



}

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